bluuebunny/crossref_metadata_2025 huggingface dataset:
Identification Method of Solid Waste Characteristic for Imported Recycled Engineering Plastics
Authors: Luo Chuan , Dai Shujun , Zhang Yin , Yuan Lifeng , Zhang Chao , Lin Zhenxing
Published: January 2021

The nitrogen content in imported recycled plastic particles was determined by elemental analyzer method and Kjeldahl method, respectively, and the acrylonitrile content was obtained by conversion to obtain the information on the consistency of polymer composition in recycled plastic particles. Two specific cases judged by this method were given. This method was available to provide a creative idea and method for the identification of solid waste characteristic of recycled engineering plastic particles containing acrylonitrile monomeric units such as acrylonitrile-styrene copolymer (SAN) recycled particles, acrylonitrile-butadiene-styrene copolymer (ABS) recycled particles, PC/ABS alloy recycled particles, PBT/ABS alloy recycled particles, PMMA/AS alloy recycled particles.
Research on the regulatory model of competitive electricity sales market
Authors: Li Yongbo , Qian Hanhan , Jiang Chunbing , Liu Dunnan , Li Genzhu
Published: January 2021

With the development of power market construction, in order to ensure the effective competition of the power market and the stable operation of the system, under the competitive electricity market mode, it has become an urgent problem to improve the power sales market supervision system. Firstly, the characteristics of the electricity sales market under the competitive electricity market mode is analyzed. Secondly, problems in the surveillance of the electricity sales market are pointed out. Finally, the countermeasures and suggestions for the surveillance of the electricity sales market under the competitive electricity market mode are put forward.
Aerodynamic performance of three-dimensional wing tip high Reynolds number turbulence with jet control
Authors: Huang Zizhen , Luo Chengyuan , Qian Peng , Chen Zhiwei , Liu Minghou
Published: January 2021

In this paper, the wing tip jet is proposed to improve the aerodynamic performance of the three-dimensional ONERA M6 wing at high Reynolds numbers. The CFD method is used to perform numerical simulation with the SST k-ω two-equation model. To verify present numerical model, ONERA M6 wing at the attack angle(α) of 2° is selected and the simulation results are in good agreement with the experimental data. The flow around the airfoil at high Reynolds number is simulated at 0°-14° attack angle, and the critical attack angle is 11° without jet. Finally, the influence of the jet on the aerodynamic characteristics of the airfoil at different attack angle are studied and it is found that the lift coefficient and lift-drag ratio of the airfoil increase with jet.
Internet-of-Things-Assisted Smart Grid Applications in Industry 4.0
Authors: Su Jinglei , Chu Xue , Chen Ming , Kadry Seifedine
Published: January 2021

This paper studies some recent advances in the field of Smart Grid, including the application of some intelligent algorithms to optimize energy efficiency and energy collection, in order to have some impact on the green theme of Smart Grid under the intelligent system of the Internet of Things. For optimization in SG, evolutionary or heuristic algorithms play an important role. Cat Swarm Optimization (CSO), Emperor Penguin Optimization (EPO), Butterfly Mating Optimazation (BMO), Honey Bee Mating Optimization (HBMO) and many other algorithms have been applied to SG optimization, and more and more flexible, skilled and robust algorithms will be added to contribute to SG optimization in the future.
Study on Pressing Pipe Pile into Complicated Foundation
Authors: Haitao Liu , Jie Sun
Published: January 2021

Pre-stress high-strength concrete piles have been widely used in many constructions in recent years, and it was relatively difficult to press pipe pile statically into complicated ground. With mud of large proportion protecting holes, pushing piles into Pre-cited hole in sandy ground was introduced in this assay, and the requirements of engineering demands were fully met after a strict on-site test, which could be a worthy reference for the similar projects..
Composition Form and Function Configuration of Intelligent Terminal Based on Edge Computing for Power Internet of Things
Authors: Liang Xiaolin , Sun Donglei , Li Wensheng
Published: January 2021

The intelligent terminal is a key device in the Power Internet of Things (PIOT), which plays a core role in the process of accurately sensing the state of power equipment and adjusting the user’s electricity behaviour in real time. As a decentralized computing architecture, edge computing plays an important role in improving the data processing capacity and operation reliability of PIOT. This paper describes the operation process of PIOT based on edge computing, by studying the form of intelligent terminals in the field of power transmission, distribution and consumption, putting forward the basic configuration, specific function and principles of intelligent terminal. Combined with the operation characteristics and actual demand of power system, the application analysis of information perception ability and online control ability of intelligent terminal is carried out.
Probabilistic Dynamic Optimal Energy Flow Calculation for the gas-electric coupling system
Authors: Xu Shenzhi
Published: January 2021

Due to pollution and energy shortage, the multi-energy interconnected system formed by natural gas and electricity coupling has attracted a lot of attention because of its cleanness and high efficiency. The operation of natural gas system and electrical power system belong to different time scales. At the same time, more and more new energy sources such as wind and photovoltaic power generation in the electrical power system increase the uncertainty of power supply. The operation of gas-electric coupling system must consider the impact of these factors. In response to these problems, this paper considers the impact of timing on the operating state of gas-electric coupling system based on the multi-period optimization model, and proposes a probabilistic energy flow calculation method, namely the Latin Hypercube sampling Markov Chain simulation (LHMCS). This method can quickly obtain the influence of random factors on the operating state of gas-electric coupling system. Finally, a simulation example verifies the rationality and effectiveness of the method proposed.
Experimental study on Tig welding properties of 6061 and 7003 aluminum Alloys
Authors: Zhu Qiang , Yu Han , Zhang Jiquan , Li Miao , Hu Xiaoguang
Published: January 2021

High Strength Aluminum Alloy is usually used in transmission line rush-repair tower to meet the requirements of component strength and structure weight. Aluminum Alloy has different composition and heat treatment state, and its properties vary greatly. In this paper, Al-Mg-Si Alloy 6061-T6 and Al-Zn-Mg Alloy 7003-T6 are selected to test. The test was carried out to reseach the Weldability of two kinds of Aluminum Alloy, with two Specifications and two kinds of welding wire. The purpose of this paper is to provide a reference for the selection of materials and the connection of members in the emergency repair tower of Aluminum Alloy.
Synthesis of Na2Mn0.8Fe0.2Fe(CN)6 and its application as cathode material of sodium ion battery
Authors: Liu Zhao , Zhang Wei , Jiang Yan
Published: January 2021

The Prussian blue cathode material with a unique three-dimensional structure in sodium ion batteries had great potential. Na2MnFe(CN)6 and Na2Mn0.8Fe0.2Fe(CN)6 cathode materials were prepared by the improved co-precipitation method of chelating agent, and the electrochemistry of the half-cell was tested. The results showed that the first discharge capacity of the two materials can reached 152.4mAh/g and 119.5mAh/g respectively at 0.1C(1C=170mA/g). The capacity retention rate of Na2MnFe(CN)6 was only 43.2% after 100 cycles at 0.2C current density, but Na2Mn0.8Fe0.2Fe(CN)6 can reached 70%. The capacity retention of Na2Mn0.8Fe0.2Fe(CN)6 can still reached 69.8% after 100 cycles at 0.5C current density. The discharge specific capacity fluctuation of Na2Mn0.8Fe0.2Fe(CN)6 was smaller than that of Na2MnFe(CN)6.
The Evaluation of Solely Renewable Energy Based Virtual Power Plants Potential for Ancillary Services Provision
Authors: Zhang Guoliang , Ouyang Litao , Yang Senlin
Published: January 2021

High penetration of variable renewable energy sources in the utility grid drives the increasing need for ancillary services (AS) in electricity markets. Wind and Photovoltaics power plants are proven technically and economically capable of providing AS to system operators. To estimate the potential of AS provision by solely renewables based Virtual Power Plant (VPP), an evaluation methodology from the perspective of machine learning (ML) is proposed in this paper. Then, the methodology is tested using open-source datasets that contain hourly power output from wind and solar power plants located in 21 regions of France.
Efficacy of vegetable waste biogas slurry on yield, quality and nitrogen use efficiency of cauliflower
Authors: Zhichao Zhao , Shifeng Zhao , Longyun Fu , li Yao , Yanqin Wang
Published: January 2021

Biogas slurry can be used as a nitrogen (N) fertilizer, and has been suggested to reduce chemical fertilizer input and improve vegetable quality. The present study aimed to evaluate the effects of vegetable waste biogas slurry topdressing on the yield, quality and nitrogen (N) use efficiency of cauliflower. A field experiment consisting of five treatments during topdressing (CK: no N input, CON: farmer’s conventional N fertilizer input, HBS: substitution of half the amount of N fertilizer with vegetable waste biogas slurry, BS: substitution of the total amount of N fertilizer with vegetable waste biogas slurry, and DBS: substitution of double the amount of N fertilizer with vegetable waste biogas slurry) was conducted. When compared with that of the CON treatment, the HBS, BS, and DBS treatments increased the yield of cauliflower by 4.7%, 13.7%, and 15.3%, respectively. Furthermore, the BS and DBS treatments improved cauliflower quality compared with that of the CON treatment. The HBS and BS treatments increased the N use efficiency and the DBS treatment reduced the N use efficiency compared with that of the CON treatment. Considering the increased fruit quality and N use efficiency, the substitution of fertilizer N with equal amount of vegetable waste biogas slurry during topdressing in the production of cauliflower is recommended in northern China.
Characteristics and development of interdigital back contact solar cells
Authors: Pengcheng Qiu , Pengxiang Qiu
Published: January 2021

Silicon-based solar cells are an important field for the development of the photovoltaic industry. The grid electrode on the front surface of the traditional silicon solar cell causes shading loss. However, the positive and negative electrodes are placed on the back surface of the interdigitated back contact(IBC) solar cell, which causes no shading loss and improvement of photoelectric conversion efficiency. The core of the IBC silicon solar cell is the interface control, field effect control and the design of the positive and negative electrode patterns on the back. Different manufacturing processes ensure the accuracy of the grid electrode and reduce production costs. This paper systematically introduces the structure and interface characteristics and development history of IBC solar cells, and looks forward to the development trend and application prospects of IBC solar cells.
A Survey on Current Situation of Rural Household Waste Treatment and Disposal in Guangdong Province
Authors: Tang Ying , Hong Chengyang
Published: January 2021

The categories, collection and disposal method of rural household wastes in Guangdong Province as well as related intentions were collected and investigated through the questionnaire survey method, in an effort to figure out the current situation of rural domestic waste disposal in this area. A total of 169 valid questionnaires were collected in the questionnaire survey, which included 169 administrative villages in 17 prefecture-level cities. The survey results showed that when the respondents were listing the main components of household wastes, the probability for kitchen wastes to rank the top reached as high as 87%. 84% of the 169 surveyed administrative villages implemented the standardized management of household wastes, among which only 18 ones disposed the wastes after classified collection. In the current phase, the equipment of collection facilities was evidently better than that of terminal treatment facilities in the administrative villages. The intention survey results indicate that the ordinary people not only show the subjective willingness, but also are glad to take an active part in protecting the environment.
An optimization method of horizontal well completion control water and sand
Authors: Zhang Guohui , Wang Peng , Chen Rong , Li Liangchuan , Jiewen Sun Guihu , Zhang Xiwen
Published: January 2021

With the development and maturity of horizontal well drilling and completion technology, horizontal wells are widely used in various reservoirs and have achieved good development results. Due to horizontal wells in the reservoir through a long distance, horizontal section of the reservoir physical property heterogeneity, water avoidance height difference and horizontal wellbore flow with toe effect, leading to production pressure difference and water breakthrough time in all parts of the shaft is different, the level of sand and bottom water cresting is strong heterogeneity, oil well early water breakthrough and local a large amount of sand production, the serious influence of horizontal well production and development of comprehensive benefits. In this paper, based on the prediction model of critical production pressure difference of sand production in horizontal wells and the prediction model of water appearance time of horizontal Wells in bottom water reservoir, the critical production pressure difference and water appearance time of sand production in each micro-element section are quantitatively determined along the horizontal well section, so as to form a design method of horizontal well completion that takes water and sand control into account. And ICD horizontal well completion method as the research object, water breakthrough time, yield as the optimization goal, control sand as constraint conditions, with each section down into the number of ICD string and nozzle sizes as design variables, the ICD horizontal well completion parameters established multi-objective optimization model, obtained the comprehensive consideration of water control sand control effect of the optimal ICD completion program.
Parameter sensitivity analysis of sewage irrigation infiltration process in sandy clay with HYDRUS-1D simulation
Authors: Jing Yangyang , Li Tielong , Zhu Xiaojing , Zhang Nan , Xia Ziwei
Published: January 2021

The HYDRUS-1D model is used to analyze the sensitivity of various soil hydraulic parameters under constant head infiltration conditions. The results show that: under constant head infiltration conditions, the perturbation of each parameter is sensitive to the impact of soil water potential, the order is: n>θs>Ks>a>θr, where n is a parameter which has a greater impact on the simulation results of soil water potential. The sensitivity order of the influence of each parameter on the cumulative infiltration is: Ks>n>θs>θr>a, where Ks and n are the parameters that have greater impacts on the cumulative infiltration. Under the constant water head infiltration condition of sewage irrigation, simulation analysis should calibrate the accuracy of n, Ks and θs parameters.
Sensitivity analysis of wave direction in wave numerical model
Authors: zhen Liu , Han-bao Chen , Ya-nan Xu , Yong-zhou Cheng , Zhao-xu
Published: January 2021

The sensitivity analysis of wave direction is carried out for three cases, namely, the excavation of outer channel, surge and typhoon in the shield port. The results show that for the sheltered port with excavated outer channel, the wave direction sensitivity near the entrance is strong, and the one-way wave sensitivity is stronger than the multi-directional wave, so it is suggested that the main wave direction analysis should be densified to 32 azimuth angle; for the swell sea area, when its long-period characteristics lead to the wave near shore transmission process, the greater the wave direction change, the more concentrated the wave direction perpendicular to the shoreline, so the wave direction of the swell sea area is divided. For the influence of typhoon, the wave direction should consider the possibility of the change of the strong typhoon path, and for the strong wave direction, it is suggested to be Increased to the four or eight azimuth.
Experimental study on sand blocking characteristics of silt curtain in the ocean nearshore settling basin
Authors: Peng Cheng , Chen Song Gui , Wang Yi Na
Published: January 2021

This article contraposes the sand blocking characteristics of silt curtain in the ocean nearshore settling basin, two-dimension physical model experiments were conducted to study the horizontal permeability coefficient and sand blocking effectiveness. The effects of different elements (current speed, tide level and sediment grain size) were considered respectively to analyze the influence of sand blocking effectiveness. The results show that, the horizontal permeability coefficient of silt curtain is not only related to the size, shape and connectivity of pore structure, but also depends on the sandiness water movement where it is in. The horizontal permeability coefficient reduces with the current speed increase. The silt curtain shows a higher sand blocking characteristic for a larger sediment grain size. The faster current speed and the bigger sand-carrying gap that is it means the higher tide level leads to more obvious sand blocking effectiveness decrease with other conditions unchanged.
Analysis of hydrodynamics and sediment conditions around East Coast Sea Area in Bay of Bengal
Authors: Zhong-hua Tan , Han-bao Chen , Ya-nan Xu , Ning Guan
Published: January 2021

The bay of Bengal is an important sea area of the 21st century Maritime Silk Road. Systematic analysis of the hydrodynamic and sediment characteristics of the bay of Bengal is conducive to the development and implementation of offshore and coastal projects in the bay of Bengal. In this paper, based on the historical reanalysis data of ECMWF and the observed data of several hydrological stations along the east coast of Bangladesh, including wave, tide level, tidal current and sediment data are verified and assimilated, and the characteristics of wind wave, water level, tide and sediment along the east coast of Bengal are analysed. The hydrodynamic and sediment conditions in the bay of Bengal are generally characterized by “strong tide, strong wave and high suspended sediment concentration”. The bay of Bengal is easily affected by cyclonic storms, which causes a great increase in storm surge. The above situation will lead to the complicated sediment erosion and deposition of storm surge, strong wave and strong tide and high suspended sediment concentration. At present, there has no deep-water port and coastal power plant located in the bay of Bengal. Whether to build a deep-water port or how to transfer at sea should be paid attention to or studied in depth.
Analysis Wave Characteristics in the Southeastern Bengal Bay Based on Different Data Sources
Authors: Xu Yanan , Chen Hanbao , Zhang Guofan , Wang Rong , Tao Ran
Published: January 2021

The research uses the wave parameters of OWI and ECMWF including wave height, period and direction, and analysis the wave characteristics of the sea area throughout the year and the wave characteristics of the NW wave. For the analysis of wave characteristics of waves biased to NW, OWI analysis biased towards NW waves in which wind and waves accounted for 62.6% and swells accounted for 37.4%, showing mixed wave characteristics dominated by wind and waves; while ECMWF analysis was biased towards NW waves. Wind and waves accounted for 24.5%, and swells accounted for 75.4%. There are big differences between the two data sources in the wave pattern analysis of NW direction. The research further uses the model to calculate and analyze the wave conditions of the Bay of Bengal waters affected by the monsoon (without considering the introduction of ocean waves). The results also show that the NW wave is characterized by a mixed wave feature dominated by wind and waves. The proportion of wind and waves is 76.1%, the proportion of swell is 23.6%, the average period is about 4.7s, and the maximum average period is less than 9s. From the analysis of the calculated directional spectrum, the biased NW wave caused by the monsoon also shows the characteristics of a bimodal spectrum, in which the wave energy is mainly reflected in the average period of about 5s. The research results show that the NW wave is a mixed wave feature dominated by wind and waves. There are long peak wave swells in the wave train, and the wave height and periodic characteristic values are relatively small.
Research on the Mechanism of Breakwater Damaged by Typhoon Waves under the Background of Climate Change
Authors: Luan Yingni , Yin Zegao , Chen Hanbao
Published: January 2021

Typhoons are violent storms that occur in the tropical oceans of the Northwest Pacific and South China Sea. The waves caused by typhoons are often the strongest dynamic on the coast. The south-eastern coast of China and Japan is in the most frequent and severe area affected by typhoons, and typhoon waves often reach more than 10m. Based on many years’ coastal wave survey data in Japan, it was shown that typhoon waves have been continuously strengthened in the past 100 years, and typhoon tracks and duration have also changed. During the “Mangkhut ” typhoon, many projects along the south China coast were damaged by typhoon waves. Simulation result of the typhoon waves caused by the typhoon showed that the designed wave conditions were exceeded. The physical model is used to reproduce the situation of the breakwater being destroyed by typhoon waves, and analyses the failure mechanism.
Effect of river ecological restoration by symbiotic system of aquatic plants
Authors: Xiao Huan , Jia Jianna , Chu Qiang , Liu Liankun
Published: January 2021

Integrated effects of three different combination of aquatic macrophytes community (emergent, floating-leaved and submerged species) on river ecological restoration were investigated. LNH (Lythrum salicaria L, Nymphaea L and Hydrilla varticillata) showed the best performance in terms of COD removal yet LNV (Lythrum salicaria L, Nymphaea L and Vallisneria natans (Lour.) Hara) ranked first in terms of TN removal and TP removal. Due to the significant distinction of LNV on TN removal, LNV was suggested as the best option for river ecological restoration using combination of aquatic macrophytes community. A drastic reduction of pollutants in the early phase of treatment was observed for both COD and nutrition removal process. However, the timing of drastic reduction for COD was Day 5, while that of TN and TP was Day 17. Absorbtion and phytoremediation were the main process that contribute to the rapid removal of pollutants.
Threat assessment of Tianjin Qilihai wetland from human activities based on principal component analysis
Authors: Chu Qiang , Liang Baocui , Peng Shitao , Zheng Tianli , Li Guoguang , Zhang Kailei , Liu Liankun , Jia Jianna
Published: January 2021

Tianjin Qilihai wetland is an important wetland nature reserve in north China, which has important ecological value. Over the last few decades, the Qilihai wetland has been developed by human on a large scale, and the natural ecosystem has been seriously disturbed by human activities. In this study, principal component analysis was conducted on 7 indicators that may have potential impacts on the Qilihai wetland from 2013 to 2017 to assess the threat of human activities to the wetland area. The results show that from 2013 to 2017, the impact of human activities on the Qilihai wetland is increasing year by year, among which the industrial development, transportation and the increase of human activities around the wetland may be the main threat for the wetland.
A novel approach for measuring the black level of the ship smoke
Authors: Hu Jianbo , Peng Shitao , Deng Mengtao
Published: January 2021

With the development of the economy, more and more attentions have been paid to the air pollution in China. As a vital means in transportation, the inland-waterway and sea ships possess many incomparable advantages. In the meanwhile, the air pollution caused by ships brought great troubles to the coastal environment. China has begun to strengthen environmental monitoring along the coastline. As a major form of air pollution, the black smoke exhausted by ships bothers the living environment. In this paper, a novel approach is proposed to measure the black level of ship smoke. Moreover, the proposed method is running on the App installed on Android mobile operating platform, which could reach the goal of black level measurement via a precise and convenient manner. Therefore, the proposed approach cloud well facilitates environmental monitoring and protection.
Preliminary Study on Spatial and Temporal Distribution and Behavior of Tourists in Beihai Park in Winter
Authors: Sun Jiahui , Liu Ge , Li Jingyi , Zheng Tianli
Published: January 2021

Tourists are the main users of the park, whose spatial and temporal distribution and behavioral characteristics are the most real reflection of the construction of the park environment. Tourists in Beihai Park were selected as the research object. Through field investigation and interview investigation, the main behavior characteristics of tourists in different time and space in winter were studied. Finally, from the perspectives of tourists relation with time and space, we analyze the existing problems, understand the causes of these phenomena, and then put forward the corresponding countermeasures and suggestions, and make suggestions on the construction and management of such parks.
A compound artificial nest designed for oviposition of various fish
Authors: Huang Wenbo , Qiu Ning , Zheng Tianli , Sun Jiahui
Published: January 2021

Due to the influence of human factors and natural factors, the oviposition grounds and living environment of fish have been seriously damaged, and the decline of fishery resources is obvious. In recent years, artificial fish nests are widely served as a good means to restore fisheries resources and their degraded habitats, summarizes the materials, structure, nesting methods and existing problems for artificial fish nest, according to the artificial fish nest which is complicated to make, has a short service life and the existing artificial fish nest only aiming at the shortcomings of the herbaceous oocytes, we designed a compound artificial fish nest. The complex artificial fish nest consists of a frame, which is provided with two kinds of soft and hard egg adhesive medium to provide ecologic spawning conditions for grass spawning, gravel spawning and water spawning fish whose spawning ground is damaged, so as to increase and improve the population structure and quantity of wild fish.
Wind Environment and Loading Mitigation Effects on Coastal Enclosed Coal Yards with Porous Gables
Authors: Su Ning , Peng Shitao , Ye Yin , Hong Ningning
Published: January 2021

In order to prevent dust emission, coastal coal yards are enclosed by coal sheds. The dust suppression rate increases as the closure of the coal shed by sacrificing the ventilation rate. Adopting porous gables may provide a balance between natural ventilation and dust suppression as well as mitigate the aerodynamic loading effect. Through wind tunnel tests and numerical simulation, the present research take an practical coastal power plant coal yard as an example to illustrate the natural ventilation, dust suppression and aerodynamic loading mitigation effect quantitatively. The results have shown that, with a favourable gable prositiy of 30%, the natural ventialtion rate can be ehanced from 0.7 to over 2.0 times/hour compared with solid gables. The dust supression could be increased from 56% up to 80% compared with open gables. The unfavorable extremum aerodynamic suction coefficients on the central area and edges of roof are reduced by 20% and 70% respectively. The results provide a supportive evident that adopting prorous windbreak gables is a environemntal friendly and economic construction scheme for coastal enclosed coal yards.
The microbial community composition and population change during bioremediation of uranium tailings
Authors: Chuiyun Tang , Juan Zhong , Ying Lv , daozhi Ma , Mingjiang Zhang , Jianlei Wang , Xingyu Liu
Published: January 2021

Uranium tailings produced in the process of uranium mining and metallurgy are an important source of uranium pollution, and pose a serious threat to the ecosystem and human health. In this study, Bacillus sp. as a functional bacterial when the uranium tailings were remediation in situ at 30°C and pH 6.5, aim to explore the response of the indigenous microbial community to environmental changes during the restoration process. The result indicted that after 14 days of remediation, the lowest uranium concentration obtained is 25.29mg/L. Next, 16s rRNA gene sequencing was used to reveal the dynamic changes of the microbial community structure during the competition process, Firmicutes and Proteobacteria are the two dominant phylm in the environment, the total highest contribution rate is 97%. Additionally, a significance present of sulfate-reducing bacteria such as Desulfotomaculum, Anaerocolumna, Burkholderia were detected in the U-treated microcosms comparison with repair initial. The results of this paper show that Bacillu sp. can be used as a functional bacteria to remediation the uranium tailings, and it is beneficial to the growth of functional microorganisms such as sulfate-reducing bacteria in the environment.
Rural Domestic Sewage Treatment Technology Application in Conghua District of Guangzhou under the Rural Revitalization Strategy
Authors: Li Xiuyun
Published: January 2021

The paper analyzes the current situation and characteristics of rural domestic sewage treatment in Conghua District, Guangzhou city. It takes the river system as the vein and the administrative village of characteristic town as the node, which pays great attention to the overall planning of the water environment. In this area, the rural domestic sewage on both sides of the Liuxi River is selected as the research object, and the rural sewage treatment of the Yadong River Basin is taken as a project case to explore the applicability of rural sewage treatment technology, hoping to achieve a beautiful countryside with clear water and beautiful scenery, and then promote the revitalization and development of the beautiful village, which provides reference value for ecological and social benefits.
Decoupling Analysis of the Relationship between Environment Production and Economic Development in Chongqing
Authors: Tao Aixiang
Published: January 2021

In recent years, China’s ecological civilization construction has made great achievements, but there are also a series of problems. The main reason is the disharmony between economic development and ecological civilization construction. This paper uses decoupling theory to study the relationship between ecological civilization construction and economic development in Chongqing. The conclusion is as follows: the ecological civilization construction and economic development in Chongqing are in the decoupling state. In the future, Chongqing should focus on improving the quality of human resources and transforming the economic structure, and increase the investment in education and science and technology, so as to improve the level of education and science and technology, and realize the coordination of economic development and ecological civilization construction.
Effect of low temperature on the performance of UASB reactor for municipal wastewater treatment: recent advances and future perspectives
Authors: Wang Zhenyu
Published: January 2021

Upflow anaerobic sludge blanket (UASB) reactor is a widely used anaerobic treatment technology, which is essential in municipal sewage treatment, in tropical and subtropical areas. However, UASB reactors have been underutilized in low-temperate zones due to the poor performance of UASB reactors under psychrophilic conditions. This study has three primary purposes: to review the performance of UASB reactors with different parameters, to describe the limiting factors at low temperatures, and to prospect the future solutions. In the low-temperature environment, lower COD removal efficiency and production of methane in the UASB reactor have been observed in various studies. The key limiting factors are increased dissolved methane, decreased activity of methanogens and hydrolytic bacteria. This article proposed that five technologies could reduce the impact of low temperature on the treatment of municipal wastewater by the UASB reactor, which are denitrifying anaerobic methane oxidation (DAMO), direct interspecies electron transfer (DIET), bio-electrochemical systems (BES), pre-hydrolysis, and degassing membrane (DM). These technologies are promising to be developed into highly-efficient engineering strategies for treating municipal wastewater in the UASB reactor at low temperatures in the future.
Study on high efficient aromaticity degrading bacteria in oily sludge
Authors: Zhao Chuanxin , Gu Qiamin , Chen Gaoyun , Wu Weihui , Qi Xiuli , Liu Min
Published: January 2021

The degradation of oily sludge is an important subject in the field of environmental remediation, especially the degradation of aromaticity in oily sludge, because its harm to human body is immeasurable, it is urgent to find an effective method to degrade oily sludge. Taking the oily sludge of Karamay oil field in Xinjiang as the research object, the chemical composition of the oily sludge was determined through the analysis of the chemical composition of the oily sludge. A strain was isolated from nearby contaminated soil, and was identified by ultraviolet spectroscopy, liquid chromatography, Gas chromatography-mass spectrometry, and other methods, it was found that the strain had a good degradation ability to aromaticity, with a degradation rate of 98.2%.
Preliminary Study on the Landscape Design of Sponge Campus Based on LID Concept——A Case Study of landscape design in Wuhan University of Technology
Authors: Wu Junsha
Published: January 2021

In recent years, with the rapid development of the research and application of sponge city, colleges have carried out the construction of “sponge campus” with the support of the state. Based on the background of the sustainable development of the campus, this paper takes the concept of LID as the starting point, combs the related concepts and evaluation criteria of the sponge campus, takes the landscape design of the West Campus of Wuhan University of Technology as an example and discusses the key points of landscape design under the campus LID model from the macro and micro perspectives. In addition, it focuses on the discussion of macro-zoning planning, landscape rainwater collection system, plant selection and microclimate, in order to provide references for the sustainable use of campus resources and landscape design.
Engineering design of landfill leachate treatment system in a waste incineration plant in Chengdu
Authors: Ke Li , Fang Wang , Zuoming Yu , Xinsheng Lu
Published: January 2021

The engineering design and operation of landfill leachate treatment system in a waste incineration plant in Chengdu are systematically introduced. The engineering design experience of UBF+MBR+NF+RO process for leachate treatment of incineration plant and advanced oxidation process for treatment of nanofiltration concentrate are summarized, which provides reference for engineering design of leachate treatment in incineration plant. The operation results show that the effluent can meet the “make-up water for open circulating cooling water system” in The Reuse Of Urban Recycling Water—Water Quality Standard For Industrial Uses (GB/T19923-2005), and the effluent treated by nanofiltration concentrate can meet the corresponding standards in Table 2 of Standard For Pollution Control On the Landfill Site Of Municipal Solid Waste (GB16889-2008).
Research and application of polycarboxylate water reducer for precast components
Authors: ChenYanCun
Published: January 2021

Aiming at the ever-developing precast structural system, this paper developed a new type of polycarboxylic acid mother liquor, and compared it with other polycarboxylic acid mother liquors combined with various early strength agents and defoamers to study and analyze the impact on precast concrete components and engineering applications effect. The test results show that this type of water reducing agent can increase the softness of high-grade concrete and improve the workability of concrete. It can be widely used in pipe piles, subway segments and prefabricated construction projects.
A Summary of Wellbore Fluid Accumulation and Drainage Gas Production Technology in Gas Wells
Authors: Chen Ming , Sun Junyi , Gao Ersi , Tian Haonian
Published: January 2021

The problem of fluid accumulation in the wellbore of a gas well is an important factor that affects the efficiency of gas production. If the fluid accumulation is serious, the production of the gas well will decrease, and then the gas well will be flooded and stop production. It is necessary to drain the wellbore fluid to the surface in time. This article analyzes the causes and diagnostic methods of wellbore fluid accumulation, and introduces conventional fluid drainage technology such as optimization of tubing, bubble drainage, gas lift fluid drainage and mechanical fluid drainage, aiming at improving the liquid carrying capacity of gas wells and improving the gas recovery efficiency of gas wells. Examples illustrate the feasibility of drainage technology and restore normal production of gas wells.
Effects of calcium and phosphorus on aluminium phytotoxicity in soil-Chinese fir system
Authors: Xu Xiaoli , He Si , Yang Huiqin , Zhang Jinbiao
Published: January 2021

The potential toxicity of soil active aluminium (Al) on Chinese fir was an urgent problem due to the global soil acidification. The aim of this paper was to study the effects of calcium and phosphorus on Al phytotoxicity in soil-Chinese fir system by using soil culture. One year old seedlings of Chinese fir were used as plant materials. The changes and relationship of pH and active form of Al in rhizosphere soil, leaf Al and physiological indexes in seedlings of Chinese fir were analysed. The results showed that the soil pH of all treatments rose at different degree, while the content of exchangeable Al in soil was decreased under different treatments of calcium and phosphorus as compared with the control. The results also showed that the content of Al and MDA in leave was decreased, while an increase in soluble protein content in leave was observed. It was concluded that the alteration in soil rhizosphere environment may be the main factor improving physiological indexes, consequently alleviating Al phytotoxicity in soil-Chinese fir system.
How COVID-19 Impacted PM 2.5 and Air Quality in China’s Main Cities
Authors: Tang Xuening , Yang Bokai , Wu Zhechen
Published: January 2021

The air quality in modern cities is one of the topics that people are very concerned about, due to its impact on people’s health and production. There have been many studies on air quality improvement and transmission mechanisms, showing that proper measures can improve air quality efficiently. Under the unexpected COVID-19 time, lots of measures were taken by the government, and the question of whether those strict measures have somehow influenced the local air quality remains. This article mainly combines some relevant policies and behaviors during the outbreak of COVID-19 to explore whether this epidemic has an impact on emissions, and to observe whether the sub-index PM2.5 representing air quality is changed. Based on assessing the cause of air pollution in each city and evaluating the policy implemented to prevent COVID-19 from spreading, the topmost effective policies that reduce air pollution are preventing residents’ transportation, reducing deliveries, and shutting down heavy industry factories.
Synergistic Catalytic Effects of Fe-Based Bimetallic Nanocatalyst and Non-thermal Plasma on Removal of Acetaldehyde
Authors: Peng Xiaoying , Gao Yan , Zhang Zhanchao , Zhang Wenke , Li Hui
Published: January 2021

Acetaldehyde is a typical volatile organic compound (VOC) releasing from food waste. Fe-based bimetallic nanocatalyst combined with non-thermal plasma (NTP) for acetaldehyde catalytic oxidation is an high efficient and energy-saving method. The pore structure parameters of FeCoO
x
TiO2, FeCeO
x
TiO2 and FeMnO
x
TiO2 bimetal nanocatalysts were analyzed quantitatively by N2 adsorption-desorption test. The phase composition and active element valence of three Fe-based bimetallic nanocatalysts were analyzed and compared by XRD. The experimental data showed the microporous and mesoporous structures of FeCoO
x
bimetal oxides were more complete, and the elemental dispersibility was better. In the non-thermal plasma-catalyst (NTPC) system, the introduction of Fe-based bimetallic nanocatalyst significantly improved the catalytic efficiency of acetaldehyde and catalytic selectivity of CO2. FeCoO
x
TiO2 had the best performance among these three nanocatalysts with acetaldehyde catalytic conversion rate reaching 87.5% and CO2.selectivity higher than 90%, under the specific energy density (SPD) of 180 J. L-1, which was less than half of the energy consumption in a single non-thermal plasma catalytic reaction. By optimizing the microstructure and elemental composition of Fe-based bimetallic nanocatalyst, it is expected to be an effective method to improve catalytic performance, which is also a promising approach for improving VOCs removal efficiency and reducing energy consumption.
Research on Reservoir Water Quality Prediction Based on Grey Model
Authors: Zhou Yi , Hu Jiarui , Xie Mengfan
Published: January 2021

Combining the gray model to predict the water quality of Qingshan Reservoir, the analysis results show that the grey model has good applicability for the prediction of reservoir water quality. The prediction errors of total nitrogen, total phosphorus, COD5, and ammonia nitrogen are all within 30%, meeting the accuracy requirements of water quality prediction. The research results have important method reference value for reservoir water quality prediction.
A portable NDIR sensor for rapid detection of hydrogen cyanide in environment
Authors: Ren Lijun , Ma Bin , Liu Guohong , Li Jian , Xiao Yanhua , Li Danping , Liu Meng , Gao Ying , Kuang Peng
Published: January 2021

Cyanide pollution refers to the environmental pollution caused by cyanide and its compounds. As a derivative of cyanide, the leakage and excessive discharge of hydrogen cyanide will cause great harm to the surrounding animal and plant environment. Rapid detection of hydrogen cyanide can avoid some unnecessary environmental pollution. Based on the principle of non dispersive infrared(NDIR) detection, the infrared absorption of hydrogen cyanide at 3.0 μm and 14.3 μm was selected as the qualitative and quantitative basis. Two NDIR sensors were designed to detect 3.0 μm and 14.3 μm infrared absorption respectively after assembly. The standard curve between the concentration of hydrogen cyanide and the voltage response value was determined, and the performance of the two sensors was tested. Their detection ranges is 10ppm-3000ppm and 22ppm-3000ppm respectively. The maximum response time is less than 11s and RSD < 2%. After comparing the performance of the two sensors, the display values of the different sensors were processed. Finally, the two sensors were assembled into one sensor, the hydrogen cyanide concentration was displayed with one indication and different gases were mixed with hydrogen cyanide to pass into the gas chamber, which improved the anti-interference ability.
Numerical simulation and regulation analysis of subsurface flow for an underground reservoir in Weihai
Authors: Ni Ludong , Wang Weiping , Zhao Weidong , Qu Shisong , Sun Xiuxiu
Published: January 2021

With the development of social economy, the contradiction between water supply and water demand is increasing. In order to alleviate this contradiction, an underground dam is proposed to be constructed in the downstream of one river for intercepting subsurface flow and increasing conjuctive utilization of surface water and groundwater. According to the hydrogeological condition of the downstream of one river, a groundwater flow numerical model through Visual Modflow was built to analyze the regulation and storage of groundwater for underground reservoir. The conclusions are as follows: the underground reservoir of a River has great potential for exploitation; the water regulation by storage of wet, normal, dry and special dry years is 23.928 million m3, 20.565 million m3, 17.43 million m3 and 10.128 million m3, respectively, and after the construction of underground reservoir, river has a great potential for development; the extraction scheme of 36 wells with a flow rate of 0.015 m3/s for the whole year is a more suitable scheme plan.
Application of Nanomaterials in Repairing Heavy Metal Pollution Soil
Authors: Chen Su , Chen Ying , Feng Tianzhen , Ma Hongyue , Liu Xiaoying , Liu Ying
Published: January 2021

Due to the acceleration of industrialization and urbanization, a series of environmental problems have arisen, among which heavy metal pollution in the soil environment is difficult to be naturally transform into harmless substances, which has led to food security, life safety and other issues. Heavy metal contamination in soil has become one of the key issues for scholars at home and abroad. This paper mainly introduces the present situation and harm of heavy metal pollution in soil. The research status of nanomaterials in heavy metal contamination of soil was reviewed. The application of nano-materials combined with phytoremediation was discussed. The effects of nanomaterials on soil enzymes and plant enzymes were introduced. The future research directions of nanomaterials in remediation of heavy metal contaminated soils are prospected. It provides a theoretical basis for the development of practical, efficient and safe remediation technology for heavy metal contaminated soil.
Research on Chenopodium in ancient Southwest China
Authors: Gao Yuanyuan
Published: January 2021

Located in the southwest hinterland of China, southwest China has a diversity landform consists of plains, mountains, intermountain basins, plateaus. Since the late Neolithic, people living in southwest China have created diverse cultures. As for the basic subsistence strategies, agriculture facilitated the long-term occupation of settlements. While compared to central China, the ecological environment and geomorgraphy in southwest China seem more tough. According to the archaeological evidence, the Chenopodium has been used in most of the archaeological sites. Chenopodium has been cultivated and domesticated in northeast America since Neolithic until nowadays, it is still used in most areas of the world. Wheather it was domesticated in ancient China is still not clear, the archaeobotanical evidence indicates that since the late Neolithic period, the genus of Chenopodium has been exploited by ancestors in southwest China, which provides the most direct evidence for the utilization of Chenopodium. The utilization of weeds such as Chenopodium in ancient southwest China suggests the diversity acquirement methods for ecological resources, which is of great significance to understand the early civilization process in ancient southwest China.