bluuebunny/crossref_metadata_2025 huggingface dataset:
Characteristics of chlorpyrifos removal and microbial community analysis for constructed wetlands systems
Authors: Zhao Jing , Zhua Weihong , Wang Yanji , Jin Mingji
Published: March 2020

The mechanisms of chlorpyrifos removal from constructed wetland systems were determined using different initial concentrations of chlorpyrifos. The microbial community structure in the wetland system was analyzed using high-throughput sequencing technology. The results showed that, in the wetland system, the removal of chlorpyrifos was accomplished by combined substrate adsorption, plant absorption, and microbial degradation. However, there were significant differences in the removal of chlorpyrifos by substrate, plants, and microbes when different initial concentrations of chlorpyrifos were used, and with different wetland systems. High-throughput sequencing results showed that there was a negative correlation between the microbial community richness in late operation of wetland systems and the initial concentration of chlorpyrifos. In the wetland systems, Proteobacteria and Acidobacteria were the predominant bacterial phyla that conducted the removal of chlorpyrifos.
Discussion on Shanghai Water Treatment Plan
Authors: Gao Jingwen
Published: March 2020

Water is one of the most important resources in production and life, and water pollution will break the ecological balance within water and thus threaten human life and production, and even human health. At present, water treatment methods and technology are attracting attention around the world. Shanghai is the earliest Chinese city to set up modern drainage facilities, which has accumulated rich and valuable experience in water treatment. Therefore, this study takes Shanghai as the research area, summarizes sewage treatment technologies used here, and analyzes the advantages and drawbacks of these technologies. It is hoped that this research can provide a theoretical basis for the sustainable development of China’s sewage treatment technology.
Innovative Application of Electrical Automation Technology in Power Dispatching under the Environment of Energy Saving and Emission Reduction
Authors: Meng Mingchuan , Zhang Wei
Published: March 2020

Science and technology have developed rapidly recently, more and more automation technologies are applied to the production and life links, which provides a lot of help for social development and economic progress. In the power system, the power of the substation can be reasonably dispatched through the automatic control technology to reduce manual intervention and improve work efficiency. The use of power transfer automation technology can not only be more orderly and convenient to dispatch and manage, but also significantly improve the efficiency of power dispatching. It is an important technology for the development of the current power industry. This paper expounds the characteristics of power transmission automation technology, analyzes the innovative application of power transmission automation, and puts forward the trend of power dispatch automation, in order to better promote the development of China's electric power industry.
Effect of influent COD and TN on ship sewage treatment by using an aerobic-anaerobic membrane bioreactor (O/A-MBR)
Authors: Zhang Kun , Wang Yiquan , Cai Yuhang , Sun Peiqi , Li Jianing , Wang Gaoshuai , Shi Yue
Published: March 2020

The implementation of the latest International Maritime Organization (IMO) emission standards places stringent requirements on ship domestic wastewater discharges. In this study, an aerobic-anaerobic membrane bioreactor (O/A-MBR) was used to investigate the effect of influent COD and TN on ship sewage treatment. The results show that the lower volume load will affect the growth of the organism, and then affect the removal efficiency of COD. The increase of volume load is beneficial to the removal of COD, but the relatively high load will affect the removal of TN. Throughout the process, the O/A-MBR reached high COD and TN removal efficiencies with average values of 87.46% and 85.83%, respectively, and the best volume load range is obtained based on this experiment. It indicates that the novel MBR leads to good pollutants degradation effort and has great potential in practical ship domestic sewage treatment.
Analysis on Flue Gas Pollution of Coal-fired Boiler and Its Countermeasures
Authors: Bian Hao
Published: March 2020

As the main energy in industrial production, coal resources are widely used in the world. However, in the process of coal combustion will produce a certain amount of pollutants, thus causing adverse effects on the air. The analysis of flue gas treatment of coal-fired boiler aims at improving coal utilization rate, reducing flue gas emission and advocating low-carbon concept. This paper deeply analyzes the flue gas problem of coal-fired boiler, explores the effective environmental treatment technology, and makes contribution to the environmental treatment problem.
Calculation of active earth pressure against retaining walls under translation mode considering soil arching effect in cohesive soil
Authors: Du Zhengjiang
Published: March 2020

In this study, the contour of the soil arch is not assumed as a certain curve, and the soil stress analysis is conducted on a differential element with two dimensions. Herein, analytical expressions of the active earth pressure, active earth force are derived based on the static equilibrium of the differential element. Furthermore, the effects of wall-soil friction angle and soil internal friction angle on the active earth pressure are investigated. Eventually, comparisons among the proposed method of this study and the previous measured data and other analytical approaches yield satisfactory results.
Research on surface temperature inversion and spatiotemporal distribution characteristics based on Landsat data
Authors: Wu Shuang , Zhang Chao , Yang Zhen , Rong Yanni , Wang Yuxia
Published: March 2020

With the rapid development of urban scale and the rapid expansion of urban population, the urban heat island effect caused by the rapid increase of urban anthropogenic heat emissions has gradually become an important factor that seriously affects urban living environment and residents' health. This study uses the Landsat TM5 and Landsat 8OLI_TIRS remote sensing data from 2000, 2006, 2013 and 2018 to calculate the surface temperature of the main urban area of Jinan, and the spatial distribution characteristics and thermal environment of the heat island in the main urban area of Jinan. Quantitative research on the relationship with natural vegetation, provide some data support for alleviating the urban heat island phenomenon in Jinan, promote ecological environment construction, and make scientific and rational planning for the future urban development of Jinan City.
Experimental study on the temperature uniformity of radiator based on micro heat pipe array in plateau area
Authors: Wan Li , Pu Zewei
Published: March 2020

In order to study and analyze the surface temperature uniformity of micro heat pipe array radiator, through comparative experiments, we found that: When the water supply flow is 1600 L/h, and the water supply temperature is 65 °C to 85 °C, the temperature difference between the head end and the end of the array radiator filled with R141b in the horizontal direction is only 1.9 ~ 2.1°C,the temperature drop ratio in the vertical direction is only reduced from 1.3% to 0.9%; The temperature drop ratio of the first end and the end of acetone filling is 4.2% to 2.5%,the temperature drop ratio in the vertical direction is 3.2% to 1%; The temperature drop ratio of the head end and the end of the copper aluminum composite radiator is 36.5% to 20.9%,the temperature drop ratio in the vertical direction is 9.5% to 1.2%. When the water supply temperature is 75 °C, the water supply flow is 1050L/h to 2200L/h, the maximum temperature drop ratio of the head end and the end of the micro heat pipe array radiator is only reduced from 3.4% to 2.6%,the temperature drop ratio in the vertical direction is only reduced from 0.8% to 0.6%; The temperature drop ratio of the head end and the end of the copper aluminum composite radiator decreased from 35.1% to 19.4%, the temperature drop ratio in the vertical direction decreased from 5.7% to 1.5%. Therefore, the temperature uniformity of the micro heat pipe array radiator in the horizontal and vertical directions is better than the existing copper aluminum composite radiator.
Preliminary investigation on Cladocera and Copepoda in summer and autumn in Baiyangdian Lake, China
Authors: Cui Tiefeng , Li Zizhu , Liao Chenyan , Cao Zhihan , Sun Xiaoqiong , Cui Tongtong , Li Hongchang , Li Haichao , Wang Hongwei
Published: March 2020

In July and October of 2018, a survey of plankton resources was conducted in Baiyangdian Lake. There were 8 species of cladocerans and 5 species of copepods were identified. The water quality and aquatic resources of Baiyangdian Lake were preliminarily grasped, and some advice was given on how to protect aquatic living resources and water ecological environment in Baiyangdian Lake.
Study on the preparation of high content non-sintered brick with sludge
Authors: Ren Xiaoli , Ren Zihan , Lei Juan , Jin Yuqiang , Yin Hongbing , Xu Defei
Published: March 2020

The aim of this study is to prepare non-sintered bricks using the chemical sludge as raw materials, so as to realize the recycling disposal of the sludge. Through the orthogonal experiment of five factors and four levels, the influence of five different factors and their levels on the compressive strength of non-sintered sludge test blocks was investigated. The results showed that the optimal combination of orthogonal experiment is A4B1C4D2E3, the compressive strength reaches the maximum value of 24.29MPa; Through the analysis of the range, it was found that factor C had the greatest effect on the compressive strength, followed by the cement (P.O 32.5), hydrophobic agents and re-dispersible emulsion powder, the crack resistant fibre had the least effect. Considering the cost and R analysis, the combination of factors was adjusted as A3B1C4D2E1, and three verification experiments were conducted, the average compressive strength was 23.57MPa.
Partial nitritation and anaerobic ammonium oxidation in biofilter reactors treating low ammonium strength wastewater
Authors: Chen Jiao , Lu Yixin , Tang Li , Huang Wen , Li Yangtao
Published: March 2020

Partial nitritation (PN) and anaerobic ammonium oxidation (ANAMMOX) were applied in biofilter reactors to treat low ammonium strength wastewater. The removal efficiency and contribution of PN-ANAMMOX process to CODcr, BOD5, NH3-N, TN and TP were investigated. The results showed that the average removal rates of CODcr, BOD5, NH3-N, TN and TP via PN-ANAMMOX process were 91.9%, 96.7%, 98.9%, 92.8% and 93.3% respectively when hydraulic load was 1.0 m/d. The effluent CODcr, BOD5, NH3-N, TN and TP concentrations were lower than 13.8, 4.8, 0.76, 4.4 and 0.28 mg/L, respectively. The PN-ANAMMOX process showed high efficiency and stability in removing C, N and P pollutants from wastewater. PN reactor played a major role in the removal of CODcr, BOD5, NH3-N and TP. ANAMMOX reactor played a leading role in TN removal.
In-situ Tests and Analysis for Droplet Size Distribution on the Clean Flue of Coal-fired Power Plant
Authors: Li Zonghui , Cao Wenguang , Liu Xiu , Chen Jun , Duan Cuijia
Published: March 2020

The clean flue gas after FGD of coal-fired power plant is taken as the analysis object, and the particle size analysis for droplets under complex conditions is studied. Selected 600MW unit is typical enough, the particle size range is mainly between 3 and 20 μm. The test will provide the first-hand data for the removal of fine droplets.
Research and application of carbon footprint correction method in construction of new building evaluation model
Authors: Bi Xiaoqing , Jiang Zhendong
Published: March 2020

This article cites a carbon footprint correction method and uses it to build an evaluation model for new buildings. By introducing a carbon footprint correction method, the goal is to build a high-efficiency, low-energy consumption evaluation model for new buildings. Comprehensively consider 15 indicators of 4 dimensions, including residential environment, energy efficiency and carbon footprint, then calculate the weight of each indicator and assign value analysis to it, and construct the evaluation model of the new building, and finally use the deviation rate of the carbon footprint to modify the evaluation level. This research can provide a usable evaluation model for the construction of new buildings, so as to scientifically and reasonably guide the planning and construction of new buildings with high efficiency and low energy consumption.
Research on Air Pollution Control Status and Air Governance of "2 + 26" Cities
Authors: Lang Jiankang
Published: March 2020

"2 + 26" cities have been the focus areas for air pollution control in recent years. Encouraged and guided by national policies, they have brought tremendous development opportunities to the development of the atmospheric environmental protection industry. Air pollution has great harm to human health, industrial and agricultural production, and atmospheric climate. "2 + 26" cities play an important role in the country, and their air pollution control is urgent. Based on the "2 + 26" cities, this paper analyzes the pollution status and management prospects of the "2 + 26" cities with data. In addition, we put forward corresponding countermeasures based on the "2 + 26" urban pollution status, and provide a reference for relevant departments to carry out air pollution control.
KI-MIBK extraction flame atomic absorption spectrophotometry for determination of cadmium in soil of Jining area
Authors: Wei Yin , Gao Fan , Gong Weilei , Zhang Kai
Published: March 2020

The collected soil samples of Jining area were subjected to microwave digestion (HNO3 + HF + H2O2), and the absorbance of the organic phase MIBK was determined by flame atomic absorption spectrophotometry after extraction with KI-MIBK. Results According to the measured results, within 20 meters, the content of cadmium increased gradually with increasing distance, and gradually decreased with increasing distance after 20 meters. The content of cadmium in the soil shows a clear change trend due to the distance from the source of pollution. Based on this change, favorable conditions suitable for crop growth can be created.
Temporal and Spatial Distribution Characteristics of PM2.5 Concentration in Tianjin and Simulation Analysis of Sources of Heavy Pollution Process
Authors: Xia Weibing
Published: March 2020

In Tianjin, there are many heavy pollution events with PM2.5 as the primary pollutant. It is clear that the spatial and temporal distribution of PM2.5 concentration and the source of heavy pollution process have far-reaching significance for the comprehensive management of PM2.5. Using Tianjin's environmental data for 2014-2017 and in 2016, meteorological data, combined with WRF-Chem model, studied the spatial and temporal distribution characteristics of PM2.5 concentration in Tianjin and the source of heavy pollution process. The results show that since 2014, the concentration of PM2.5 in Tianjin has been decreasing year by year. The monthly variation curve of PM2.5 concentration showed a “U”-shaped distribution, which was seasonal in winter and spring, and low in autumn and summer. The daily variation of PM2.5 concentration is bimodal, with the main peak appearing at 08:00-09:00 and the second peak occurring at 21:00-00:00. The spatial distribution of PM2.5 concentration in Tianjin is different in each season. The spring, summer, autumn and winter highvalue centers are located in Jinghai District in the southwest of Tianjin, Beichen District in the north of the central city, Wuqing District in the west and Yinzhou District in the north. The source of pollutants in the autumn and winter seasons of Tianjin simulated by WRF-Chem model showed that the local source contribution rate was 56%, and the external source transportation contribution rate was 44%, including transportation in Hebei Province and Shandong Province.
Evaluation Model of Residents’ Waste Classification Participation Degree Based on Investigation in Changzhi City
Authors: Yang Boxing , Zhang Chi , Qi Shuyu , Tao Yuexin , Luo Yunfei , Wang Yiduo
Published: March 2020

Source waste separation can greatly reduce the cost of solid waste treatment and disposal, and has considerable economic value. However, there are many kinds of domestic waste and their composition is complicated, which makes it difficult for residents to participate in it. As a collective behaviour of public participation, the difficulty of its existence can test the level of the role played by all participants. Therefore, based on the field research and literature comparison of Changzhi City, this paper establishes the analytic hierarchy process (AHP) evaluation model, and takes residents, government and market as the main participants to evaluate the classified participation of residents' garbage, and puts forward some suggestions to provide the basis for policy decision-making of public management in the field of environment.
Analysis on Noise Reduction Method of Boiler Room in City
Authors: Wang Yiduo , Yang Boxing , Zhao Chongzheng
Published: March 2020

Noise environment attracts people's attention constantly at present. In the city, the noise of boiler room is especially serious. Noise has not only physical but also psychological effects on human body. This paper introduces the noise reduction methods commonly used in boiler rooms and discusses the comparison of noise reduction effect and economic cost between sound insulation technology and sound absorption-insulation technology.
Research on technical problems of urban domestic sewage treatment under environmental protection form
Authors: Chen Jing
Published: March 2020

The increasing urban scale in China has led to an increase in the water consumption of urban residents. Freshwater resources have become more and more precious. This has increased the pressure on sewage treatment to a certain extent, so in this case it should be Urban sewage treatment issues are researched and improved and strengthened to allow freshwater resources to be recycled. These have very important practical significance for the urban ecological environment protection and the promotion of the scientific development of the city.
Research on coal supply and demand matching process based on carbon emission
Authors: He Qi
Published: March 2020

The use of coal is an important part of China's energy use and an important source of economic development. Due to the need for sustainable development and environmental protection, the problem of uncoordinated transactions between the two parties in the transaction process has been closely watched by all sectors of society. Based on the current shortage of coal market transactions, this paper designs a coal supply and demand matching process considering carbon emissions from an intermediary perspective, aiming at reducing carbon emissions and improving matching efficiency.
Research on influencing factors and countermeasures of industrial carbon emission in Hebei province based on Kaya model
Authors: Fan Zhiguo , Hu Qi
Published: March 2020

In view of the world carbon emission problem, the current status of low carbon economy research is reviewed. Based on the historical data of industrial carbon emissions in Hebei Province from 2008 to 2017, based on the historical data of industrial carbon emissions in Hebei Province, the Kaya decomposition model was used to find the industry affecting Hebei Province. The driving factors of carbon emission levels and the trends of various factors, and then combined with the LMDI model, the absolute contribution of each driving factor to the economic development of Hebei Province, and the specific analysis of carbon emission levels, and finally put forward rationalized emission reduction measures and suggest.
Study on the current situation of municipal sewage sludge disposal and disposal process
Authors: Jiang Jingbo
Published: March 2020

In the process of urbanization, each city should actively respond to the call of the country and regard sustainable development as the core of development. Based on this, cities should pay attention to urban environment and ecological benefits. In cities, urban sewage plants should pay more attention to sludge treatment and disposal. Through strict sludge treatment, the impact of heavy metals and pathogens in the sludge on the urban environment will be reduced. Based on the continuous updating of sludge treatment technology and processing equipment in China, urban sewage plants must strengthen the rational disposal of sludge. In order to improve the efficiency of sludge disposal and avoid pollution to the environment, it is particularly important to do a good job in sludge treatment status and technology research. Briefly analyse the source and nature of sludge in urban sewage treatment and the status of sludge treatment and disposal, and focus on the relevant sludge treatment technology to provide reference for better application of sludge treatment technology.
Study on Environmental Protection Based on Urban NIMBY Facilities
Authors: Zhang Zhanmeng
Published: March 2020

With the rapid development of industrialization and urbanization in China, environmental problems have become increasingly prominent and citizen’s awareness of environmental protection has been constantly improved, especially for the new neighborhood avoidance projects which may cause significant environmental events. Moreover, it is difficult for citizens to find appropriate ways while safeguarding their personal rights and interests, which leads to NIMBY conflicts. Therefore, this paper makes an empirical analysis on the current situation and problems of NIMBY projects in Beijing, Tianjin and Hebei through questionnaire survey, and puts forward the strategies to solve the problems.
Assessment of Applicability of Non-point Source Pollution Along Gantangjiang River Basin Based on SWAT Model
Authors: Yang liya , Zhou Hao , Dai Liyuan
Published: March 2020

Gantangjiang River Basin was took as the object of study on non-point source pollution to establish a non-point source pollution model applicable to Gantangjiang River Basin based on SWAT model theory and make assess the applicability of the model. The relative error Res of monthly mean value was less than 25%, the monthly correlation coefficient R2 ranged from 0.72 to 0.89, and the monthly efficiency coefficient Ens was not less than 0.5, with a good fitting effect. This study demonstrated that it was feasible to simulate the non-point source pollution along the Gantangjiang River Basin, based on SWAT model. The simulation result showed that the load capacity of non-point source pollution in knowable basin changed in an irregular "W" trend as months went by. The rainfall intensity and capacity influence the pollution load in a certain extent.
Impact of influent ammonia concentration on partial nitrification of biological sand filter and kinetics
Authors: Chen Jiao , Lu Yixin , Luo Xiu , Li Yangtao , Tang Li
Published: March 2020

The impact of influent NH4
+/-N concentration on partial nitrification performance was investigated in a biological sand filter. The removal kinetics model of NH4
+-N in partial nitrification-sand filter was established and its accuracy was verified. The results showed that the NH4
+-N removal rates and NO2
−-N accumulation rates stabled at about 60% and 94% respectively and the effluent NO2
−-N/NH4
+-N ratios were 1.20~1.39 when the hydraulic load was 1.0 m/d and the influent NH4
+-N concentration was 45~50 mg/L, indicating that the sand filter had good partial nitrification effect, and the effluent quality basically met the theoretical influent demand of anaerobic ammonia oxidation. The kinetic model of NH4
+/-N removal in sand filter could be described as Sh
/S
0=exp(-1.0033S
0
−1.1337
h) when the influent NH4
+-N concentration was 10.2~61.3 mg/L. The model had high accuracy and could provide scientific guidance for effluent quality prediction and optimization design.
The application of PAC and PAM in dynamic treatment of beryllium copper wastewater
Authors: Shi Yang
Published: March 2020

The dynamic removal of beryllium and copper element was achieved by slanting plate clarifier after the wastewater of beryllium copper production line was settled by PAC and PAM. When the pH of wastewater was 9.0, PAC with a mass concentration of 50 mg/L at a flow rate of 200-250 L/h and PAM with a mass concentration of 2 mg/L at a flow rate of 150-200 L/h were injected in the wastewater sequence, respectively. The treated wastewater flowed through the slanting plate clarifier at a flow rate of 30 m3/h and then filtered continuously through the filtration device. The results show that Be2+ and Cu2+ concentrations are lower than 5 μg/L and 2 mg/L, respectively, which complies with the Standards of GB 8978—1996. Therefore, the Be2+ and Cu2+ elements in the wastewater can be removed at the same time.
Underwater Object Segmentation Algorithm Based on Depth Information
Authors: Zhu Xiaowen , Hu Zheyu , Tu Dawei , Zhang Xu
Published: March 2020

In the process of developing the ocean, the underwater robot's accurate positioning of the object is the key to the success of the underwater mission. Due to the interference of environment and other factors, the traditional GrabCut algorithm cannot accurately locate the target from the image collected by the visual sensor. This paper proposes an image segmentation algorithm based on depth Information, which is improved on the GrabCut algorithm and fuses depth information. First, the foreground area of the original image is extracted by using the depth information of the image to become a new image to be segmented. Then, two interactive operations are conducted on the new image. Finally, GrabCut algorithm is used to obtain the segmentation result of the target. Compared with GrabCut algorithm, the algorithm in this paper is more effective, which can improve segmentation accuracy and target positioning effect.
Underwater image conversion method based on multi-layer plane refraction model with light field processing method
Authors: Yao Qinzhou , Zhuang Sufeng , Tu Dawei , Zhang Xu , Xie Liangliang
Published: March 2020

In order to adopt the conventional visual measurement technology to underwater application, this paper proposes an underwater image conversion method based on a multi-layer plane refraction model, which converts the underwater image into an air image. First, under the multi-layer plane refraction model, the imaging process of the underwater camera is modelled in the form of a four-dimensional light field parameterization, and the direction vector of the air image is calculated using the light field direction information. Then, the perspective projection transformation is used to obtain the corresponding pixel coordinates of the direction vector and the image plane. Finally, the transformed air image is obtained by interpolation method, using the mapping relation of the corresponding image point coordinates before and after the transformation. Simulation and experimental results show that the average error of the corrected image is 0.56 pixel, and the high-precision air image provides strong support for subsequent underwater 3D reconstruction.
The Design of Globe Valve Innerleakage Detection System Based on Acoustic Emission in Natural Gas Pipeline
Authors: Xia Guanghui , Gou Weijie
Published: March 2020

AE leakage detection system is designed, ball valve leakage detection software is written, so that the real-time and accurate leakage is tested, and the detecting data are restored. This paper tries to determine an effective detection system by way of the theoretical and experimental analysis. The results make real-time detection possible. As a result, the ball valve leakage detection, location and estimation problems are preliminary solved and reference for future research is provided.
Flocculation-Magnetic Separation Technology for the Rapid Treatment of First Flush Rain
Authors: Feng Hui , Jia Xiaochen , Gu Xiujun , Su Zhilong , Wang Rui , Qin Pingping , Ding Ye
Published: March 2020

In order to rapid treatment of first flush rainwater, a new flocculation-magnetic microsphere was prepared. And magnetic microspheres were prepared using the modified Stöber method. Magnetite (Fe3O4)-silica (SiO2) core-shell microspheres have superparamagnetism verified by using XRD, FTIR and VSM analysis. Also, Fe3O4/SiO2 (FS) microspheres have no significant reduction after at least reused five times. The optimal feeding order and conditions were flocculant, magnetic powder and PAM, reaction temperature 25 °C, static sedimentation time 30 min, and pH=7. Under the optimized condition, 62% of COD and 98% of turbidity were removed. Especially, Fe3O4/SiO2 microspheres can effectively adsorb heavy metal ion.
Research on the Antioxidation of Rosemary in Polypropylene
Authors: Zheng Qiukai , Wang Fang , Fan Jingjing
Published: March 2020

Effects of Rosemary Antioxidanton, extracted from Rosmarinus officinalis with different solvents, on the antioxidantive properties of polypropylene were evaluated by measuring the oxidation induction temperature. For comparison purposes, the effects of a synthetic phenolic commercial antioxidant Irganox B215, were also analyzed. The results showed that Rao is a more efficient thermal antioxidant for polymers compared to Irganox B215 in low concentration. Rao can be used as a natural antioxidant in place of synthetic antioxidants for polymers. Rao has the characteristic of being harmless and having high activity, good stability and abundant resources to be a good natural antioxidant.
Study on the impact of climate change in China
Authors: Qi Binhua
Published: March 2020

Global warming is not only an important problem in the survival and development of human beings, but also an urgent problem to be solved by the contemporary government. China is not only a big country in the world, but also ranks first in the world in total population, economic scale and economic growth rate. With the improvement of the national economic strength, China's greenhouse gas emissions are also increasing year by year, the ecological environment has been seriously damaged, leading to the rising of the environment at the same time is also facing severe environmental challenges and huge pressure to reduce emissions, so, How to deal with the problem of climate warming is particularly important in China.
Study on Eco-environmental Evaluation of Southwest Frontier Ethnic Areas Based on SWOT-AHP
Authors: Du Fang , Liu Yang
Published: March 2020

The article uses the SWOT analysis framework to analyze the advantages, disadvantages, opportunities, and threats of the environment in the ethnic minority areas of the Southwest Frontier, then judges the importance of each dimension of influence in the SWOT. In order, the environmental governance model of the southwest ethnic region was put forward, and strategic choices were made for the environmental governance of the southwest ethnic region.
Relationship between Particulate Matter Exposure and Inhaled Amount for Different Exercise Patterns of Healthy Adults
Authors: Li Xiyuan , Chen Cai , Li Wei , Ma Dedong
Published: March 2020

Air pollution has increasingly become a threat to people's daily life. Exposure to air pollution will have a negative impact on people's health. However, little research has been done on the impact of air pollution on people's different ways of exercise. The purpose of this study is to explore and determine the relationship between particulate matter that has an aerodynamic diameter of 2.5 microns or smaller (PM2.5) exposure and different exercise patterns of healthy adults. Thirty volunteers were recruited and validated by the equivalent model of PM2.5 approximate inhalation volume-time. The predictive model of PM2.5 particulate matter exposure (y) and time (x) was derived as follows: y = 1.4663x-593.41. It is concluded that when people are exposed to air, the shorter the exercise time, the less PM 2.5 will be inhaled. Therefore, when people exercise outdoors, the use of fast running will be the best way of reference, and the amount of PM2.5 inhaled is the least.
Analysis of the Influencing Factors of Industrial Air Pollution in Shenzhen
Authors: Xu Sheng
Published: March 2020

As one of the central cities of the Guangdong-Hong Kong-Macao Greater Bay Area (GBA), Shenzhen has excellent air environment performance. Based on the construction of Kaya identity and LMDI method, this paper decomposes the SO2 emission of Shenzhen industry in 2009-2016 and explores the impact of seven factors on the SO2 emission change of Shenzhen, including population, development level, industrial structure, energy structure, energy consumption intensity, energy pollution intensity and end treatment. The results show that: population and development level factors have the effect of increasing emissions, industrial structure and energy structure factors have less impact, while energy consumption intensity, energy pollution intensity and end treatment factors have the obvious effect of reducing emissions. Combined with the current situation of development, it is suggested that Shenzhen should promote the upgrading of industrial structure and energy structure, promote the progress of production technology, and strengthen the end treatment. Other cities in GBA should actively learn from the relevant measures and governance experience taken by Shenzhen to improve the capacity of industrial air pollution reduction.
Carbon emissions influence factors and peak forecast study of China
Authors: Li Lin , Xue Weixian
Published: March 2020

Global warming is one of the most serious challenges facing mankind in the sustainable development of twenty-first Century. Related studies have shown that 90% of the probability of global warming may be caused by excessive emissions of greenhouse gases (GHG), which will pose a serious threat to the survival and development of human beings. To actively respond to the climate change, The Chinese Government promised that the carbon emissions will peak around 2030 in Paris Climate Change Conference. In order to realize the smooth progress of carbon emission reduction, it is necessary to understand China's carbon emission reduction factors, make clear the time of carbon emission and explore the potential of carbon emission reduction, and finally find a way of carbon emission reduction in accordance with China's national conditions.
Study on Estimation and Improvement of Agricultural Carbon Emission Efficiency in China
Authors: Wu Haoyue , Luo Luxi , Chen Wenkuan
Published: March 2020

In order to have a better understanding of agricultural carbon emission efficiency in China and in east, west and central regions, slack based measure (SBM) under the undesirable outputs is used for measuring the agricultural carbon emission efficiency, where the agricultural carbon emission in 2006 to 2015 in 30 provinces of China is estimated as undesirable output. Then the input-output looseness is used for exploring the reasons for the efficiency difference in different regions and their improvement direction. The results show that the efficiency in east is high and stable, and that in central and west is low. In terms of the whole country, the two indexes with the biggest room for improvement are agricultural capital input and land input. The redundancy rates of agricultural capital input in the three regions are relatively high, while those of land input are high in the central and west regions. This paper aims to provide some references for making rational policies on agricultural carbon emission reduction with regional differentiation and overall coordination.
The response of domestic tourist in tourism city when encounter the haze weather: a case study of Xi’an, China
Authors: Yang Junhui , Xia Luxi
Published: March 2020

Under the background of the haze’s influence to tourism, this study takes Xi’an, China as a case to explore the response characteristics of domestic tourists to the haze weather in tourism cities, and draws the conclusion as follows. First, although the suddenly severe haze weather will causes the inconvenience of travel and the decline of tourism quality, but the tourists still take the urban public transport to go on their trip by the negative ways, such as changing the tourism destination or ignoring the haze’s influence. When the tourists face the destination choice, they generally prefer the indoor tourism destinations which are less affected by haze weather, but the juvenile and low-educated tourists still prefer outdoor and suburban tourism destinations even if encountering the haze in their trip; Second, the tourists are very dissatisfied with the tour in the haze weather, and the degree of haze’s influence on tourists' perception is generally showed as “photograph > vision >experience> mood”, but the tourists with different characteristics have different perceptions to the haze; Last, the tourists’ attention rate has increased significantly after experiencing haze weather in this tour, but the tourists with different characteristics have a significant differences in the growth rate of haze’s attention.
Study on Effects of Black Soldier Fly Feces on Rice Growth
Authors: Wu Xiang , Cai Ruijie , Wang Xiaobo , Wu Nan , Xu Xiaoyan
Published: March 2020

In order to rationally apply organic fertilizer from black soldier fly (BSF) feces, the effects of different amounts (0, 2%, 4%, 6%, 8%) of BSF feces on rice growth were studied through rice pot experiments. The results showed that the dry matter mass and the yield of rice treated with 4% BSF feces were the highest, compared with the control, which were increased by 40.20% and 49.59%, respectively. While the application of 8% BSF feces inhibited the rice plant height, above-ground dry matter mass and rice yield, which were reduced by 9.98%, 22.59% and 22.66%, respectively. The 4% BSF feces promoted the growth of rice and increased yield, which is an reasonable amount of fertilizer.
“NaClO2-Sea Water” Wet Denitrification Technology Using NOx Treatment Technology in the Desulfurization and Denitrification of Ship Exhaust Gas
Authors: Chen Peng
Published: March 2020

To minimize the emission pollution of nitrogen oxides (NOx) in marine diesel engine exhaust, based on the existing NOx treatment technology, the "NaClO2-sea water" wet denitrification technology was further proposed. The denitrification performance of NaClO2 solution in seawater and NaClO2 solution in fresh water was analyzed by self-designed and built experimental platform. Moreover, the effects of the temperature of the absorption solution, the initial concentration of NaClO2 and the concentration of NO in diesel exhaust gas on the denitrification performance of NaClO2 sea water solution were studied. The experimental results showed that the denitrification rate of NaClO2 solution with seawater as solvent was slightly lower than that of NaClO2 solution with fresh water, but the denitrification duration of seawater solution had obvious advantages over that of fresh water solution. In addition, by increasing the temperature of the absorption solution and the initial concentration of NaClO2 and decreasing the concentration of NO, the denitrification rate of NaClO2 sea water solution was increased. Whereas, if the temperature exceeded a certain limit, the continuous denitrification time of the solution would be decreased. Therefore, “NaClO2-sea water” wet denitrification technology has the advantages of cheap raw materials and long continuous denitrification time. High denitrification efficiency can be achieved by optimizing reaction conditions, so it can be used for denitrification of marine diesel engine exhaust gas.
Non-point source pollution comprehensive control in Tongchuan City
Authors: Yao Shuang , Zhao Liang , Zhou Jing , Zhou Xin , Zhou Weili
Published: March 2020

With the development of economy and the change of life-style, non-point source pollution has become one of the key points of ecological environment regulation. In order to research how to control non-point source pollution according to the specific situation of towns, this paper selected Hongshi Town, Laohu Town and Xinxing Town of Tongchuan City in Shaanxi Province as the representative residential areas for analysis. In this paper, the present situation of non-point source pollution in the three towns were analyzed, and the regulation measures were put forward according to the specific situation of each town, such as laying sewage pipes or rain trenches, adding public toilets and garbage collection points. Through the comprehensive treatment of non-point source pollution, the ecological security of cities and towns has been guaranteed, the ecological balance of regions has been maintained, and a benign ecological security pattern is forming.
Study on Rural Ecological Environment Pollution and Environmental Protection Countermeasures Based on Air Pollution Index
Authors: Li Yun
Published: March 2020

At present, China's rural economy is developing rapidly, followed by environmental issues that are of common concern to all. Reform and opening-up have brought vitality to rural township enterprises. At the same time, the development of township enterprises has also brought greater pressure to the rural ecological environment. The pollution load borne by the rural ecological environment has increased dramatically, resulting in increasingly prominent rural environmental problems. It not only seriously affects the health of the broad masses of peasants, but also affects social stability and restricts the sustainable development of the country. The increasingly prominent problems of rural ecological environment restrict the further development of China's rural economy. In the construction of a new socialist countryside today, to solve the problem of rural environmental pollution has become a top priority. With the rapid development of rural economy and society, the process of agricultural industrialization and urban-rural integration is accelerating. Based on the air pollution index, this paper analyzes the characteristics and causes of environmental pollution in the development of township enterprises and the Countermeasures for environmental protection.
The Study of Mathematical Model and Chemical Effect of Self-excited Cavitation Reactor on Degrading Antibiotics
Authors: Wang Jian , Li Dalin , Wei Chen
Published: March 2020

Hydrodynamic cavitation is a promising technology in the degradation of the residual antibiotics which can exist in the environment for long periods as they are chemically stable. Varied methods for degrading antibiotics, bubble dynamics models coupled with chemical reactions, experiment setup and cavitation generators are evaluated. A novel self-excited cavitation reactor which can produce pulse and cavitation using the fluid characteristic is proposed. Compared with traditional hydrodynamic cavitation generator, the self-excited pulsed cavitation jet generator have longer hydraulic detention time, faster bubble collapse, more hydroxyl radical production, better treatment effect, and wider application prospects. Simple design, high energy efficiency and no secondary pollution contribute to the great potential of selfexcited cavitation reactor in wastewater treatment.
Study on the Change of Nitrite Content of Yutang Pickles under Different Storage Conditions
Authors: Wei Yin , Zhang Minghao , Gong Weilei , Zhang Kai
Published: March 2020

Objective: To study the determination conditions of nitrite in pickles by spectrophotometry, select the best experimental conditions, determine the content of nitrite in pickles under different storage conditions, and find a better storage method for pickles. Methods: A certain amount of pickle was homogenized. Saturated boric acid and deionized water were added. The water bath was cooled to room temperature. Potassium ferrocyanide and zinc acetate were added and filtered to obtain a backup filtrate. The nitrite was used as a standard to determine the pickle sample solution at 538 nm. Absorptance at place. Results The nitrite concentration of the sun-dried sample: 1.8435 mg/kg dry; 0.3441 mg/kg with pickling solution; the nitrite concentration of the indoor light sample during the day: 0.5462 mg/kg dry; 0.2048 mg/kg with pickling solution; Nitrite concentration of samples in cabinets protected from light: dry 1.84 mg/kg; with pickling solution 1.2973 mg/kg; nitrite concentration of samples at high temperature (27 °C): 1.2973 mg/kg; room temperature (20 °C) samples Nitrate concentration: 0.7511 mg/kg; Nitrite concentration at low temperature (7 °C): 0.2048 mg/kg. Conclusion: The dry sample has a higher nitrite content than the pickled solution sample, the dark sample has a higher nitrite content than the strong light sample, and the high temperature sample has a higher nitrite content than the low temperature sample. Therefore, storage conditions such as pickling solution, proper light and low temperature are selected.
Study on the Difference of Transformation of Livestock and Poultry Feces by Black Soldier Fly
Authors: Xiao Yang , Geng Weina , Yang Yongkang , Wang Xiaobo , Xu Xiaoyan
Published: March 2020

In this experiment, livestock and Poultry feces (chicken manure and pig manure) were mixed in different proportions, and cow dung and co-substrates (rice bran) were added in chicken manure and pig manure in different proportions, so as to analyze and study the transformation of livestock and poultry feces by black soldier fly larvae (BSFL) under different treatments. The results showed that the conversion rate of chicken manure by BSFL was higher than that of pig manure, and the highest conversion rate of pure chicken manure was 15.31%. Adding cow dung to chicken manure and pig manure resulted in a significant decrease in the conversion rate of BSFL, and the addition of cow dung was not conducive to the conversion of mixed feces by BSFL. The transformation effect of BSFL on chicken manure, pig manure and cow manure is: chicken manure >pig manure >cow dung. The addition of rice bran can promote the transformation of chicken manure and pig manure by BSFL. When the proportion of adding is 15%, the conversion rate of BSFL is the highest, which is 19.74% and 19.25%, respectively.
Study on the Improvement Path of Water Environment Quality -- A Case Study of Tianjin
Authors: Yang Yuhong , Bao Jingling , Song Bingkui , Li Ran
Published: March 2020

In recent years, although the water environment quality of Tianjin has improved, there are still some problems such as poor water environment quality, shortage of water resources and weak water ecological function. Based on the analysis of the current situation of water environment in Tianjin, this study analyzes the existing problems and puts forward the implementation path matrix of water environment protection, which can reduce water environment pollution.