bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Influence of the Lime and Peanut Dry Cake Amend Pb Contaminated Soil with Pakchoi
Authors: Liu Jun , Nie Jin Xia
Published: August 2013

In order to study the soil amend agent how to suppress the function of the vegetables absorb Pb, the Pb was added in the experimental soil in pakchoi pot, The lime and peanut dry cake were added to the experimental soil as modifier, and the varying concentrate of modifiers, lead effect on pakchoi biomass and lead accumulate were discussed in this paper. Through the determination of Pb content of aboveground and underground part of pakchoi by ICP, the lime and peanut dry cake can resist lead absorption were proved, and the lime achieved better inhibitory effect of the two. By analyzed the BCF of two parts of pakchoi, two types of modifiers had proved can reduce the pakchoi BCF of Pb in the soil. The lime was more efficient than the peanut dry cake on reducing BCF of Pb.
The Optimization of Operation Parameters of Microfiltration Membrane System
Authors: Liu Qi Feng , Wang Qi , Yan Shao Hui , Zhao Ji
Published: August 2013

The sustainable flux in dead-end mode of MF membrane filtration was confirmed in this study. Analytic results show that when flux above which an irreversible deposit (fouling) appears. The sustainable flux is dependent on the hydrodynamics and system properties (pH, ionic strength, membrane characteristics, particle characteristics, etc) and position along the membrane. Below the sustainable flux, tiny fouling is observed. In addition, the optimal pre-coagulation condition was found based on the maximum turbidity and organic remove rate.
Wastewater Treatment of Pulp and Papermaking Industry by Heterogeneous Fenton Fluid-Bed Reactor
Authors: Yu Jun , Li Gang , Zhang Yan Hao , Gao Lei , He Bo
Published: August 2013

The effluent from biochemical treatment of pulp and paper making wastewater treated by heterogeneous Fenton fluid-bed reactor was evaluated. The results showed that in the condition of COD 350mg/L, and the optimum conditions of pH at 3, FeSO4 2.5mmol/L, H2O2 3.4mmol/L, and reaction time at 20 minutes, the removal efficiencies of COD and color are more than 85% and 90%, respectively. The best drug dosing ratio of heterogeneous Fenton fluid-bed reactor has positive relations with COD of raw water, and the mole ratio of COD, FeSO4, and H2O2 is 6.4:0.74:1.
Research on Cadmium Adsorption-Desorption Dynamics of Biochar
Authors: Zhang Zhen Yu , Meng Jun , Dang Shu , Gao Ming Chao , Che Wen Fu
Published: August 2013

This research studies the effect of cadmium adsorption-desorption kinetics with different pyrolysis temperature biochar. The biochar which derived from rice husk at 300°C, 400°C, 500°C temperature for 30 minutes were added into Cd2+ solutions of 0.5 mg/L, 2.5 mg/L and 5 mg/L respectively. The optimal model of cadmium adsorption desorption kinetic behavior is the Level 1 dynamic equation. Indicates the increasing Cd2+ adsorption ability of biochar with pyrolysis temperature rising. Biochar also shortens adsorption process at relatively low Cd2+ initical concentrations.
Research on Species Selection for Vegetation Restoration on Uninhabited Islands - Take China’s Qiaoliangshan Island as Example
Authors: Yu Miao , Wu Jin Chao
Published: August 2013

In recent years, China’s island ecology has been destroyed seriously, so ecological recovery of islands is an urgent task. Qiaoliangshan Island is a typical island in China that suffers from ecological problems after land ecology is destroyed by human beings. This paper introduces general situation of Qiaoliangshan Island, researches on species selection for vegetation ecological recovery on Qiaoliangshan Island and aims to provide a reference for ecological recovery of Chinese islands.
Study on the Dust-Retention Capacity Resulting from Greenbelt of the Main Roads in Xuchang
Authors: Zheng Jing Gang
Published: August 2013

With the acceleration of urbanization, dust composed of solid particles has become one of the major air pollutants in urban areas. The dust-retention capacity and its spatial distribution of 8 greenbelt types are discussed. The results show that the dust-retention capacity of Cedrus deodara is the highest, and the total dust-retention capacity is (2.85±0.28) g/m2, in contrast, only (0.48±0.04) g/m2 for Ligustrum quihoui. Moreover, the dust-retention capacity of outside of 7 greenbelt types is higher than that of inside, except Osmanthus fragrans. The dust-retention capability of outside indicates an order of lower section, middle section and upper section, and an order of middle section, lower section and upper section of inside.
Validation of CALPUFF Applicability within Urban Area
Authors: Dong Long Xiang , Zuo Hong Chao , Dong Wen Cheng
Published: August 2013

An atmospheric tracer dispersion study known as Urban Meteorological and Tracer Experiment was carried out in Yuzhong County, Gansu province in northwest of China, during October of 2011. By using the observational data, the applicability of CALPUFF model based on Gaussian formula was verified within urban area. The results show that (i) CALPUFF model can reasonably reflect the actual observations on the whole, and the high value centers of tracer concentration was changed with wind direction over the urban canopy layer. (ii) The simulated plume central axis has a bias of 10-15° with observations, and the simulation error is very much big at the single point, especially at the ground.
Numerical Simulation of Magnetic Field and Photocatalysis Coupling Swage Treatment Reactor
Authors: Wu Chun Du , Jiang Zhi Hui , Xie Qing Jie
Published: August 2013

A new reactor was designed. It based on magnetic field and photocatalytic technology which have the ability to improve the swage treatment effect. It was improved and optimized according to combining photocatalysis with the magnetic field that could strengthen photocatalysis process. The modified k-ε equation model was used to simulate the wastewater velocity in the reactor. Results show that in the reaction zone,the fluid appeared circulation and the turbulence intensity was strong,which had advantage of increasing the contact of photocatalytic materials and organic molecules for improving the magnetic field and photocatalysis coupling reactive efficiency.
Optimization of the Preparation of Mercaptoacetyl Chitosan and its Flocculating Performance
Authors: Zhang Cui Ling , Zhang Ming Yue , Chang Qing
Published: August 2013

The optimum preparation conditions of the macromolecule flocculant-mercapto-acetyl chitosan (MAC) using orthogonal experiment were investigated, and its performances were tested by using the wastewater containing turbidity and/or heavy mental ions such as copper, cadmium, mercury, nickel ions as the target in different pH value in detail. The experimental results show that: (1)The optimal preparation conditions of MAC are as follows:the mass ratio of m (chitosan):m (mercaptoacetic acid) is 1:1, pH value is 5.0, and the reaction time is 3.5 h. (2)The selectivity order of different heavy metal ions by MAC is Cd2+>Cu2+>Ni2+ for the same experimental conditions. (3)With the increasing in pH value the removal efficiency of Cu2+ by MAC was enhanced. (4) The removal efficiencies of heavy mental ions were greatly promoted by the cooperation effects for the water sample containing turbidity causing substances.
Studies on the Combined Removal of the Fine Particulate Matter and Mercury from Coal-Fired Flue Gas
Authors: Lv Jian Yi , Cao Li Yuan , Tao Ya
Published: August 2013

This paper elaborates the formation, distribution, migration and transformation of mercury and particulate matter, also some of the existing removal process methods. Using the mass balance method calculates the mercury content of coal-fired product. According to the result, we can targeted design a strong practicality, feasibility joint removal process to fine particulate matter and mercury of the thermal power plant.
Study on Denitrification Technology Improvement of a Coal-Fired Power Plant
Authors: Yin Lian Qin , Mao Shu Dong , Ji Hai Hong , Zhang Shan Shan
Published: August 2013

The nitrogen oxides emission concentration of a coal-fired units exceeded national standards. This paper analyzed the problem of the denitrification equipment, the denitrification process was transformed with low NOX combustion and hybrid SNCR&SCR denitrification technique, according to the existing denitrification technology. The nitrogen emission concentration of the coal-fired units reach the current national emission standards after transformation.
The Comparison Study on the Performance of Centrifugal Atomizer
Authors: Ding You Qing
Published: August 2013

High speed rotating centrifugal atomizer is the key equipment for the flue gas processing. The centrifugal high-speed atomizer is running at high speed, it makes micron liquid-drop in order that chemical reaction happened between micron drop and harmful gas. Its function has direct impact to the emission produced from WTE(waste to energy) plant. The different driving form affects the atomizers stability of high speed movement, atomization effect and the running life directly. For a long time, the transmission quality of belt drive or direct coupling drive is one of the focus issues. Based on the high speed centrifugal atomizer, this paper introduces the two commonly used driving forms of the atomizer, and compares their performance through the experiments. Key words: atomizer, WTE, experiment
The Problems and Countermeasures of Maintaining Wet Desulphurization in Power Coal-Fired Plant
Authors: Zhang Xue Ying , Zhou Xiao Xiang , Dong Xue Feng
Published: August 2013

Based on the study of the maintaining of wet desulphurization installments in coal-fired power plant, similar problems have been found in maintaining process. including desulphurization absorption tower, mist eliminator, slurry circulating pump, gas duct, flue damper. The corresponding countermeasures have been proposed.
Studies on the Interaction between Imidacloprid and Bovine Serum Albumin by Spectrometry
Authors: Guo Rui Xin , Wang Zhi Liang , Hu Zhi Jun , Li Guo Ling , Chen Jian Qiu
Published: August 2013

The binding studies of imidacloprid to bovine serum albumin (BSA) were investigated by UV-Vis absorption spectrum, fluorescence spectrum and synchronous fluorescence spectrometry. Under the simulative physiological conditions, fluorescence data revealed the presence of a single class of binding site on BSA and the dynamic quenching constants () were 6.851×104 L.mol-1 and 5.813×104 L.mol-1 at 310 and 315 K, respectively, proving the mode of action of imidacloprid with BSA as a static quenching. In addition, according to the Vant Hoff equation, ΔGθ <0 showed="" the="" combination="" of="" imidacloprid="" and="" bsa="" was="" a="" spontaneous="" process="" h="" sup="">θ <0 and="" s="" sup="">θ> 0, indicated an electrostatic interaction process. At the same time, synchronous fluorescence spectrum of BSA could tell us whether the conformation of BSA was changed by imidacloprid.
Thermal Pollution Prediction in the Coastal Areas of the Houshi Power Plant in China
Authors: Zhu Mu Lan , Cai Long Yan , Cao Wen Zhi
Published: August 2013

The thermal discharge from the Houshi power plant in China has been increased continuously with the increase in power supply. In order to understand the waste heat pollution conditions in the coastal areas of the Houshi power plant, we proposed a modified Princeton Ocean Model (POM) model to conduct three-dimensional numerical simulations for heat transport in the coastal areas of the plant. The proposed model has been verified to be valid in our previous study. This study employed the verified model to predict heat transport under the future operational conditions of the power plant with a thermal discharge of 217m3/s. The prediction results indicate that a larger area of waters near the plant outfall will have a temperature rise larger than 4°C, and this area of temperature rise is close to the water intake of the power plant. Besides, the heat accumulation phenomena will be serious in the depth direction and this will bring great influence to marine ecological environment, especially to benthic organisms. It is suggested that some measures are necessary to reduce temperature rise in the coastal areas of the Houshi power plant in the future.
Estimation Total Algae Biomass of Xinyun Lake and Analysis of the Benefits for Utilization of Organic Fertilizer from Algae
Authors: Ye Chang Bing , Luo Wei Jia , Li Wen Chao , Wu Yu Mei
Published: August 2013

Combined with the sample monitoring of our research and the previous studies of algae growth kinetics,the total algae biomass of Xinyun Lake that can been gathered and removed was fast estimated as 1218800m3/a. Based on the research work about the result of organic fertilizer from algae paste, the internal pollution load reductions of COD, NH4-N and available phosphorus were estimated as 13163.04t, 1018.91t and 146.26t, respectively, in 2012. At last, the environmental benefit, economic benefit and social benefit of organic fertilizer from algae were analyzed, and all of them were very significant.
Size and Composition of Ambient Particulates in the Yueguangshan-Tunnel, Taiwan
Authors: Lu Mei Fang , Huang Mei Chuan , Cheng Kuang Hung , Lin Jim Jui Min
Published: August 2013

The aim of this study is to investigate the characteristics of size distribution and chemical composition of ambient particulates inside a tunnel. Inside the tunnel, the average concentration of PM2.5and PM2.5-10was 479 and 444 μg/m3respectively. The average mass-size distribution showed a trimodal distribution (25-30, 4.0-5.0, and 2.5, PM2.5-10, and PM>10were 25%, 40%, and 35% of the total suspended particulates. Because of the poor air ventilation inside the tunnel, the particulates accumulate inside the tunnel. The dominated species of PM2.5were EC (average concentration 122.91 μg/m3, 25.78%), OC (47.68 μg/m3, 10.53%), SO42-(37.42 μg/m3, 8.24%), and NO3-(35.01 μg/m3, 7.95%), and were EC ( 131.77 μg/m3, 29.87%), OC (53.74 μg/m3, 12.15%), SO42-(31.35 μg/m3, 7.11%), and NO3-(28.10 μg/m3, 6.42%) for PM2.5-10. Results from this study showed that the concentrations of coarse particulate matter and several metals are apparently dominated by re-suspended matter rather than emissions from vehicles, e.g., Al, Ca, and Fe. Therefore, ambient particulate matter is caused by not only vehicle exhaust emission but also dusty roads and traffic-generated dust.
A Novel Biofilm Carrier-Artificial Aquatic Mats vs a Common Biofilm Carrier of Carbon Fiber: Effect on Water Quality and Phosphorus Releasing
Authors: Wang Jin Hua , Chen Jian Zhen , Lu Hai Ying , Fang Yan Ming , Yang Lin Zhang , Wu Yong Hong
Published: August 2013

Microbial biofilm plays a major role in aquatic ecosystems by acting as an important food source for fish and other aquatic creatures as well as a refuge for microorganisms. With this in mind, promoting bacterial biofilm formation on a matrix or a carrier is an important low cost strategy in keeping water ecosystem balance. In industrial wastewater processes, many biofilm carriers are built according to the microbial biofilm principle with the homophylic carrier used to treat the contaminative nature water bodies being absent. So we developed a novel biofilm carrier made from high polymer for in situ biofilm technology to improve natural water bodies and named the new carrier device as Artificial Aquatic Mats (AAMs). An investigation to research such device was performed in order to determine the influence of this novel photoautotrophic biofilms carrier on the changes of water quality and phosphorus (P) forms in sediments and to compare the effects of AAMs and carbon fiber carriers (CFC) treatment. Transparency of water appears to possibly be enhanced by the treatments of AAMs and CFC by inhibiting the harmful algae growth for allelopathy. Experimental results revealed, in a same projective area, the transparency cleaned by AAMs increased faster than that of CFC. Both devices had a certain positive effect on decreasing total phosphorus (TP) of water. In the control, there was a persistent large variationnot only the occurrence of algae blooms but also in the changes of both total P (TP) and P form concentrations in the sediments. TP concentrations in sediments of AAMs treatment remained higher than the CFC treatments throughout the experiment. With the exception of the Labile-P, the change in trend lines of all of the P forms in the two treatments did not deviate from one another. Organic matter (OM) was the most important P sink because the contributions of OM were well correlated with the TP and Labile-P. Statistical analysis in Ca-P and Residual-P showed that the AAMs-treatment could more prevent phosphorus from releasing from sediment into water column than that of CFC-treatment.
Adsorption of Chromium (VI) from Aqueous Solution by Agricultural Waste Derived Activated Carbon
Authors: Zhang Hua , Zhang Xue Hong , Zhu Yi Nian , Yuan Shou Rui
Published: August 2013

Activated carbon prepared from grapefruit peel, an agricultural solid waste by-product, has been used for the adsorption of Cr(VI) from aqueous solution. The effects of adsorbent dosage, pH and temperature on adsorption of Cr(VI) were investigated. The maximum adsorption yield was obtained at the initial pH of 3. The dynamical data fit very well with the pseudo-second-order kinetic model and the calculated adsorption capacities (23.98, 24.33 and 24.81 mg/g) were in good agreement with experiment results at 20°C, 30°C and 40 °C for the 100 mg/L Cr(VI) solution. The Freundlich model (R2 values were 0.9198-0.9871) fitted adsorption data better than the Langmuir model. The calculated parameters confirmed the favorable adsorption of Cr(VI) on the activated carbon prepared from grapefruit peel.
Control Technology of PM2.5 in Coal-Fired Power Plant and Experiment on Dedusting Performance of Typical Filters to PM2.5
Authors: Zhang Ying Shuai , Wang Chun Yu , Wang Lei , Cheng Jin Wu , Qiao Kai
Published: August 2013

People pay more and more attention on the fine particle pollution in the air with the improvement of environmental awareness. Coal-fired power plant is an important source of the fine particle emissions. The principles of three dedusting methods applied in coal-fired power plants were explained, which were electrostatic precipitator, bag deduster and composite electrostatic-bag precipitator. In addition, PM2.5 removal efficiency of three dedusting methods was analyzed and discussed based on the test results. The experiment, with the AFC-131test rig, was carried out on dedusting performance of typical filters, to study the effect of pressure drop of filters on the emission characteristics of PPS filter material of different processing technology and posttreatment.
Discussion of the Simultaneous Nitrogen and Phosphorus Removal Mechanism
Authors: Xiao Jing Ni , Zheng Li Na , Zhang Lei , Zhang Han Min , Yang Feng Lin
Published: August 2013

The phosphorus uptake rate characteristics have been investigated in different electron acceptor conditions (NO3-, O2, O2 and NO3- coexisting). The sludge was transferred from CAS, AO MBR, AOA MBR, A2O MBR or the A, B tank of MUCT-MBR systems. The results show that the phosphorus uptake rate (SPUR) have the same rule for the sludge in different electron acceptors, that is NSPUR (NO3- as the electron acceptor) <ASPUR (O2 as the electron acceptor) <TSPUR (both O2 and NO3- as the electron acceptors). There exists the aerobic denitrifying phosphorus removal process in mixed electron acceptor system. And this process shows a positive correlation with the ability of denitrifying phosphorus removal improved. The higher ability of denitrifying phosphorus uptake the sludge have, the faster nitrate consumption rate could be shown through the phosphorus uptake process under the condition of in O2 and NO3- coexisting. That is TSDNR（AO）<TSDNR（AOA）<TSDNR（A2O）. The relationship between the nitrate consumption rates is ASDNR (only O2 exist) <TSDNR (TP and O2 coexist) <NSDNR (only TP exist). The phosphorus removal mechanism might include three parts: the aerobic phosphorus uptake, the anoxic denitrifying phosphorus uptake and the aerobic denitrifying phosphorus uptake.
Effect of Flue Gas Pollution Control Devices on Mercury Emission from Coal-Fired Power Plants
Authors: Shi Ying Jie , Deng Shuang , Zhang Fan , Zhang Chen , Cao Qing , Liu Yu , Shu Xin Qian
Published: August 2013

Coal-fired power plant is one of the largest sources of mercury emitted into the atmosphere artificially. In the paper, more intensive investigations were performed in 27 power plants for observing distribution of mercury at all the effluents. Mass balance of mercury was figured out from the emission data and analysis results of mercury at all the in- and out-streams. The results show that, concentrations of mercury emitted from stack gas equipped with air pollution control devices (APCDs) range between 0.6734 and 14.4312μg/m3 with coal mercury content lower than 0.20mg/kg. FGD gypsum mercury is about 2~10 times as that of in coal. The average mercury removal efficiency by ESP is only about 29.36% while ESP +wFGD and dry-FGD+FF about 68.72% and 81.51% separately. Therefore, it is necessary to enhance the existing APCDs, wash and mix coal to Hg co-removal for coal-fired power plants.
Sucrose Transporter Gene AtSUC4 Regulates Sucrose Distribution and Metabolism in Response to Salt Stress in Arabidopsis thaliana
Authors: Gong Xue , Liu Ming Li , Wang Che , Zhang Li Jun , Liu Wei
Published: August 2013

Sporadic reports indicated that salt stress induced the expression of sucrose transporter genes, and sucrose transporters (SUCs or SUTs) as the important carriers are responsible for the loading, unloading and distribution of sucrose, but the study that SUCs are involved in sucrose distribution and metabolism under salt stress at the whole-plant level has not been reported to date. AtSUC4, as the unique member of low affinity/high capacity SUT4-clade inArabidopsis thaliana, may play an important role in plant stress tolerance. Here, through analyzing two homozygous mutation lines ofAtSUC4(Atsuc4-1andAtsuc4-2), we found salt stress induced higher sucrose, fructose and glucose content in shoots and lower sucrose, fructose and glucose content in roots of these mutants compared with the wild-type (WT), resulting in an imbalance of sucrose distribution and fructose and glucose accumulation changes of sucrose metabolitesat the whole-plant level. Our results indicated thatAtSUC4is involved in salt stress tolerance by the regulation of sucrose distribution and metabolism.
Experiment on Removal Efficiency of Dust Particle Using a Ventilation Test House
Authors: Lv Yang , Kurihara Genta , Yoshino Hiroshi
Published: August 2013

Dust particle which includes corpses and feces of the mite, animal dander, cockroaches, and mould spores can reach the lung of human and then trigger asthma disease easily. In this research, experimental studies were carried out in order to examine particle removal efficiency in a room with two ventilation systems: a ceiling exhaust system and a slit exhaust system. The results indicated that there was no clear relationship between removal efficiency and two different outlet locations. Also, from the results after the decay, the particle count in the case of the ceiling exhaust was higher than that in the case of the slit exhaust.
Experimental Research on the Advanced Treatment of Printing and Dyeing Wastewater by Compounded Biological Filtration Equipment
Authors: Fan Ling Fei , Wang Juan , Fan Di
Published: August 2013

In this study, we discussed the advanced treatment process of printing and dyeing wastewater with the patented compounded biological filtration equipment (ZL200610069538.3). The experimental samples were collected from the second effluents of a printing and dyeing wastewater treatment plant. With the experiments of four single factors and the dynamic process under four optimum parameters values, discussions were taken in terms of the effects of PFS dosing quantity, hydraulic loading, filter materials volume ratio, and gas water ratio on COD, chromaticity and ammonia nitrogen respectively. The experimental results indicated that the optimum parameter values were PFS dosing quantity of 25mg/L, hydraulic loading of 0.4m3/ (m2·h), filter materials volume ratio (biological carbon over biological zeolite) of 1.2:1, gas water ratio of 4:1 respectively. When influents values ranges of COD, chromaticity and ammonia nitrogen were 90-110mg/L, 60-80times and 3-8mg/L respectively, the effluents of COD, chromaticity and ammonia nitrogen were less than 46mg/L, 10times and 1 mg/L respectively, which could meet the National Standard of Recycling and Miscellaneous Usages of Municipal Sewage on COD, chromaticity and ammonia nitrogen requirements.
Influence of Sulfide to Nitrate Ratios on Denitrifying Sulfide Removal and Elemental Sulfur Reclamation from Wastewater Containing High Organic Carbon Concentration
Authors: Gao Shuang , Yuan Ye , Chen Chuan , Wang Ai Jie
Published: August 2013

This study evaluated the effect of sulfide to nitrate (S/N) ratios on elementary sulfur biotransformation in a simultaneous autotrophic and heterotrophic denitrifying sulfide removal (DSR) process, at a carbon to nitrate (C/N) ratio of 3/1. Four groups of batch tests were conducted at S/N ratios of 5/2, 5/5, 5/6 and 5/8, respectively. Results showed a low accumulation of elementary sulfur. Elementary sulfur was first obtained by the oxidizing of sulfide through DSR process and then was reduced back to sulfide with the interaction of surplus acetate. The highest elementary sulfur transformation rates at S/N ratios of 5/2, 5/5, 5/6 and 5/8 were 47.1%, 94.7%, 94.0% and 93.5%, respectively. It can be concluded from analysis of the stoichiometric proportion of the bio-chemical reactions that the proportion of acetate consumed in DSR process to the whole acetate consumption in the first 6 hours were no more than 50%, indicating a low efficiency of DSR process under high concentration of organic carbons, except for the condition under S/N of 5/6, during which period the highest proportion can be as much as 85.6%. Given the elemental sulfur transformation rate and the acetate consumption proportion in DSR process, it can be concluded that adjusting the ratio of sulfide to nitrate at an appropriate level (around 5/6) would be an appropriate strategy for higher elemental sulfur transformation.
Magnesium Removal from Liquors of Laterite Leaching
Authors: Liu Kui , Chen Xing Xin
Published: August 2013

In this study, magnesium removal through reaction of alkaline liquors and magnesium cation in liquors of laterite leaching was investigated. Basic magnesium carbonate and magnesium carbonate with high filtration properties were obtained at 70°C or above, whereas magnesium hydrate colloid existed in the products at temperatures below 70°C, resulting in the difficulty of product filtration. When the molar ratio of Na2CO3 to Mg2+ was 2.25:1, the reaction temperature was 90-100°C and the reaction time was 30min, nearly 100% magnesium was removed from liquors.
NOx Storage-Reduction with CO over Combined Catalysts
Authors: Xiao Jian Hua , Li Xue Hui , Wang Le Fu
Published: August 2013

The combined catalysts Mn/Ba/Al2O3-Pt/Ba/Al2O3and Mn/Ba/Al2O3+Pt/Ba/Al2O3for NOxstorage-reduction were investigated. Mn/Ba/Al2O3indicated high activity of NO oxidation and NOxstorage in the oxidation-storage reaction and certain reduction activity in the storage-reduction reaction. The combination of Pt/Ba/Al2O3with Mn/Ba/Al2O3could enhance the activity of NOxstorage-reduction under dynamic lean-rich burn conditions. Compared to Pt/Ba/Al2O3catalyst, although the Pt content decreased half over Mn/Ba/Al2O3-Pt/Ba/Al2O3and Mn/Ba/Al2O3+Pt/Ba/Al2O3, the NOxconversion increased 9.4% and 6.3% at 350 °C. The pollutions such as NOxand CO could be eliminated effectively over two combined catalysts with low Pt content under dynamic lean-rich burn conditions.
On the Accumulating Characteristics of Nuclide Sr in Comnyzacanadensis (L.) Cronq, the Hyper-Accumulator Plant
Authors: Zhang Yu , Tao Zong Ya
Published: August 2013

Studying and screening nuclide hyper-accumulator plants and their planting methods for rapid and effective radioactive decontamination in the environment is the vital study content of the environmental radioactive pollution rehabilitation and control. Taking Comnyzacanadensis (L.) Cronq as experimental material, this study measures and analyzes the accumulating characteristics of nuclide Sr in Comnyzacanadensis (L.) Cronq by treating them with SrCl2 of various concentrations and applying the technology of pot culture to imitate the natural environment polluted by radioactive nuclide Sr. The results show that as the concentration of SrCl2 increases, the accumulation of Sr in Comnyzacanadensis (L.) Cronq also increases; when the concentration of SrCl2 content reaches a maximum level of 200mg/Kg, the SrCl2 content of the above-ground part shows its highest level of 0.709mg/g DW, while the SrCl2 content of foot end 0.201mg/g DW. The experiment results indicate that Comnyzacanadensis (L.) Cronq has the basic characteristics of Sr Hyper-accumulator, due to the fact that the accumulated amount of S in its above-ground part is larger than that of R in its foot end, i.e. S/R >1.
Preparation of Modified Corncobs by Citric Acid and Study on the Adsorption of Cr (VI)
Authors: Pan Qing Shan , Liu Wei , Ma Mei Gui , Yan He Ping , Zhou Bo , Huang Du Shu , Wang Bao Sen , Wu Na , Shi Ling , Xu Shi Juan
Published: August 2013

The modified corncobs was prepared by using citric acid. Conditions of preparation, the effects of pH, initial concentrations of Cr (VI) and adsorption time to adsorption of Cr (VI) was studied. Results show that when citric acid concentration at 3molL-1, heating treatment temperature at 160°C, the treatment time at 2h, the modified corncobs had a high adsorption of Cr (VI). At room temperature, Cr (VI) initial concentration at 10 mgL-1, medium aqueous solution pH at 2.5, adsorption time at 150min, the absorption rate of modified corncobs for Cr (VI) was 96.13%, higher than absorption rate of ordinary corncobs for 22.83%.
Studies on Effect of NH4+-N on Indole Removal by Using the Laccase and the Laccase / ABTS Mediator System
Authors: Ren Da Jun , Bao Xin , Liu Li Hua , Xu Qin , Zhang Shu Qin , Wu Gao Ming
Published: August 2013

NH4+-N was choiced as an influence factor for analysis the effect on the laccase activity from the white rot fungus Pleurotus ostreatus and indole degradation. The experiments were performed with different NH4+-N concentration, with a focus on the indole degradation by laccase in the presence of 2,2-Azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) or not. Results showed that NH4+-N had a positive effect on laccase activity and also enhanced the degradation of indole. Meanwhile, NH4+-N was oxidized to NO2-.
Study on a New Technology of Flue Gas Desulfurization in Sintering Process
Authors: Wang Su Ping , Bi Xue Gong , Weng De Ming
Published: August 2013

In this paper, a new technology of sintering flue gas desulfurization is proposed. The principle is that some kind of additives is introduced into feed mix, the additives decompose into NH3in sintering process during heating, the NH3reacts with SO2gas to form ammonium sulphate solid particles, the particles are captured as dust by ESP, so the removal of SO2in sintering flue gas is achieved. The study results show that the concentration of SO2in sintering flue gas decreases gradually with the increase of additive amount, when the specific quantity of additive is 3.02kg per ton mix, the decreasing rate of SO2is up to 81.33%(mass). Since sintering dust must be recycled as raw materials, in order to solve the problem of flue gas SO2concentration is gradually increasing, the approach of increasing the amount of additive can be taken, or the dust is separately treated for sulfur removal before being used as raw sintering material. The new approach of reducing SO2emission in sintering flue gas has advantages of low investment, small occupation area and low operation cost. Moreover, the additive is inexpensive and readily available, so sintering cost is not increased obviously.
Study on Disposing Landscape Water with Polyaluminum Ferric Chloride Composite Flocculants
Authors: Ye Xia , Xu Mei , Wang Jian , Yang Feng Zhen
Published: August 2013

The flocculation effect of poly aluminum ferric chloride (PAFC), diatomit and poly(dimethyldiallyl ammonium chloride) (HCA) which was used alone or cooperated with each other, on the water treatment of the urban landscape waters in Cangzhou was studied. The effect factors included the dosage and proportion of flocculent, the pH and sedimentation time. The experiment results showed that the effect of PAFC cooperating with diatomit or HCA was better than that of the single one. The optimum mass concentration ratio of PAFC to diatomit was 1: 4, a lower mass concentration benefited the removal of turbidity. The turbidity removal effect of PAFC+HCA is the best, with the optimum mass concentration of PAFC 35mg/L, HCA 0.5mg/L ,the best pH=8~9 and the sedimentation time of 1.5 hour, the removal ratio of turbidity was as high as 94%.
Study on the Stability of Potassium Ferrate
Authors: Lan Shan Hong , Ma Ping , Wan Yong Dong , Wu Xiu Wen
Published: August 2013

The effects of potassium ferrate initial concentration, pH and inorganic salt addition on the stability of potassium ferrate were studied. The results showed that the higher the potassium ferrate initial concentration was, the poor of its stability was. The stability of potassium ferrate improved with the increase of pH. The stability of potassium ferrate got worse with the addition of inorganic salt including sodium silicate, sodium molybdate and sodium phosphate, and the law of the influence of pH on the stability of potassium ferrate was broken.
Synergy Remediation of PBDEs Contaminated Soil by Electric-Magnetic Method
Authors: Wu Chun Du , Yao Yi Fan , Xie Qing Jie
Published: August 2013

An electrokinetic and magnetic remediation system of polybrominated diphenyl ethers (PBDEs) contaminated soil was built in the laboratory. The characteristics of BDE15 migration under non-uniform electric field and uniform magnetic field were investigated. The results indicated that current and temperature in the soil reached the maximum values 100mA and 14°C respectively in 6h; the moisture content of soil near the cathode and anode was higher than in the middle position; pH values of soil increased gradually from the anode to the cathode and acid-base interface was in the soil area between 3cm from anode and 5 cm from anode; BDE15 mainly enriched in the area 5cm from the anode and reached 22.69μg·g-1.
Tangxian Jidong Cement Co., Ltd. SNCR DeNOx Engineering Practice
Authors: Ling Shao Hua , Jing Chang Yong , Ma Jing , Zhang Li Juan
Published: August 2013

Tang xian in Hebei Jidong Cement Co., Ltd. flue gas denitrification treatment works, the project uses ammonia as a reducing agent SNCR DeNOx technology. A detailed explanation of the the SNCR process characteristics and system configuration, The analysis for actual operating results of the engineering. The results show: After treatment NOx concentration is less than 200 mg/Nm3, Denitrification efficiency reach 72.82%, Ammonia slip less than 0.9mg/Nm3, Engineering put into operation, About a year reduces emission NOx 1430 tons.
Additions of Enzymes Accelerant in Fishing-Boat Fuels of Diesel Engine Exhaust Emissions Experiment
Authors: Yang Tsun Lirng , Li Mao Yuan
Published: August 2013

The exhaust from diesel engines consists of a large quantity of toxic substances, including NOx,CO2, CO, SOx, particulate matter (PM), and HC compounds from incomplete combustion. In this study, enzyme fuel additive was added to Class A fishing vessel fuel in different proportions in an experiment to measure the changes in the content of air pollutants emitted from the combustion of fuel in a single-cylinder diesel engine power generator. The specimen used in this study was a Class A fishing vessel fuel under the national policy of subsidizing fishermen in fuel consumption blended with enzyme fuel additive. In this experiment, a Class A fishing vessel fuel was used as the controlled specimen to compare three different types of diesel additive available from the market and the fuels blended with enzyme. A diesel engine power generator was used in the experiment to observe the emission of gas pollutants from the engine operated with different formulas of fuels under the same loading conditions. A gas pollutant analyzer was used to observe the content of gas pollutants and their influence on air pollution.
Impact of Humic Acid on the Charge Behavior and Coagulation of TiO2 Nanoparticles Suspension
Authors: Gong Feng , Zhang Li Zhu , Wang Li
Published: August 2013

In order to understanding of the fate and transport of TiO2 nanoparticles (Nps) in the water treatment process, this study focused on the impact of humic acid (HA) on the aggregation and charge behavior of TiO2 Nps, and investigated the removability of TiO2 Nps stabilized by HA during the coagulation process. Malvern Zetasizer nanoZS measured the changes of size and zeta potential of HA capped TiO2 Nps (HA-TiO2). Uv-vis spectrometer examined the aggregation behavior of TiO2 and HA-TiO2 NPs at different pH value. Jar tests were conducted to evaluate the removal efficiency of TiO2 NPs. HA adsorbed on the surface of TiO2 Nps could decrease the zeta potential values and enhance the stability of TiO2 Nps. TiO2 Nps could be effectively removed by aluminum sulfate (AS) under favorable condition. HA could influence the removal of TiO2 Nps during the coagulation processes. Low concentration of HA rejected the removal efficiency of TiO2 Nps, however, high concentration of HA promoted removing effectiveness.
Study on Excess Sludge Reduction in Quiescent Condition
Authors: Xie Min , Huang Cong , Liu Xiao Bo
Published: August 2013

The cell dissolved effect of acid and alkali lysis on excess sludge, as well as the influence factors including pH, temperature, time and other factors were examined in this work. Under the optimal experimental conditions of pH=12, T=60°C, t=2h, the results showed that the contents of soluble protein, soluble total sugar, soluble chemical oxigen demand (SCOD) in the organic material dissolved out increased obviously. Therefore, the sludge reduction efficiency was remarkable.
Efficient Removal of Cd2+ by the Mesoporous Silica Functionalized by APTES
Authors: Cai Xiao Feng , Ji Kang Wei , Wu Wan Hao , Hou Jie , Hao Shi You
Published: August 2013

Amino-functionalized mesoporous silica (AFMS) with high amino loading, high surface area, and large pore size was synthesized using the anionic surfactant N-lauroylsarcosine sodium (Sar-Na) as template and 3-aminopropyltriethoxysilane (APTES) as co-structure directing agent (CSDA). The synthesized AFMS was characterized by N2adsorption-desorption, TEM and elemental analyzer. The results of the removal of Cd2+from aqueous solution showed that the pH value of aqueous solution affected the removal efficiency of Cd2+greatly, and that unary adsorption isotherm of Cd2+on the AFMS was well described by the Sips isotherm model, in which the adsorption capacity was 2.43 mmol/g for Cd2+, much higher than the literature data.
Effects of Anthropogenic on Karst Groundwater Geohydrochemistry in an Urbanized Area
Authors: Lan Jia Cheng , He Qiu Fang , Hu Ning , Wang Peng , Ren Kun , Chen Xue Bin
Published: August 2013

Laolongdong Underground River used to be important drinking water source, but the water quality has been deteriorated since 1990s and the underground river becomes a sewer nowadays because of anthropogenic and urbanization influence. In order to find out the impacts of water-bedrock interaction, domestic sewage and agricultural activities on groundwater, the chemical characteristics of the groundwater were monitored each month to research the contamination sources and the contributed factors. The result shows that the groundwater is characterized as the HCO3-SO4-Ca type, which implys that groundwater geochemistry is controlled by middle and lower Triassic carbonate rocks. Moreover, the concentrations of K+, Na+, Cl-, and PO43-reveale an increasing trend and NO3-deceasing from 2008 to 2012. According to general contamination sources, the data implys that urbanization process and land use changing caused karst ground water pollution process and contaminations convert from agriculture effort to sewage and animal feces effort.
Modeling Copper Transport in Saturated Sandy Loam Column
Authors: Ji Shu Hua , Wu Mei Ling
Published: August 2013

Through the soil column experiments, the migration behavior of heavy metal copper ions in saturated sandy loam is analyzed, and it is found that the inflow solution with high concentration is conducive to the migration of copper ions. In the meantime, the software package of CXTFIT is utilized to conduct fitting for the outflow dynamics of copper ions with deterministic equilibrium model and non-equilibrium two-zone model, and predict the changing process of copper ion concentration at the different depths of soil column over the time. The results show that in the indoor saturated homogeneous conditions, the simulation accuracy of fitting parameters that applied deterministic equilibrium model is higher than that used the non-equilibrium two-zone model. Moreover, the influence of fixed water on the copper ion migration can be ignored.
Removal Mechanisms for Pharmaceuticals and Personal Care Products (PPCPs) in Water by NF/RO Membranes
Authors: Huang Zhong Hua , Liu Zheng Li , Zhu Li Jun , Akbar Guli Mira
Published: August 2013

Pharmaceuticals and personal care products (PPCPs) have been widely detected in aquatic environment in recent years; as emerging micro-pollutants, their influence on human health and ecological environment safety are of increasing concern. Membrane filtration is considered as the suitable separation method for PPCPs removal due to different removal mechanisms. This paper reviews the removal efficiency and removal mechanisms for PPCPs by NF/RO membranes.
Advanced Oxidation Treatment of Papermaking Wastewater by Homogeneous Fenton Reaction
Authors: He Hong Ping , Wu De Li
Published: August 2013

The quality of water from traditional two-stage biochemical treatment process of papermaking wastewater cannot meet the pollutants discharge standard of paper industry,therefore it is necessary to develop new advanced treatment processes to further treat the effluent. This paper adopts the homogeneous Fenton oxidation technology to treat the effluent from a secondary sedimentation tank of a papermaking factory by batch experiments. The optimum reaction conditions are H2O2dosage 6.54mmol/L, FeSO4.7H2O dosage 200mg/L, pH=3, t=1.5h and of all the experiments the dosage of polyacrylamide is 3ppm. The COD of the treated water is under 50mg/L and its removal rate can reach as high as 75.4%, the chroma almost falls to zero, the effluent meets the first grade of the national wastewater discharge standard. Therefore, the homogeneous Fenton is an effective alternative for papermaking wastewater advanced treatment, due to its high effect.
Aerobic Treatment of Poplar APMP Pulping Wastewater by Sequencing Batch Reactor (SBR)
Authors: Li Na , Niu Mei Hong , Ping Qing Wei , Zhang Jian , Shi Hai Qiang
Published: August 2013

In this paper, the poplar Alkaline Peroxide Mechanical Pulp (APMP) pulping wastewater was treated by the SBR. The pulping wastewater was from the processes of washing, soaking and defibrination. The COD of the pulping wastewater was 5671 mg/L and the BOD was 1862 mg/L. The B/C (biological oxygen demand/chemical oxygen demand) ratio of the pulping wastewater was 0.32, which indicated that the wastewater was suitable to be treated by biological methods. SBR technology was used to treat the pulping wastewater. After a series of experiments, the best conditions for the pulping wastewater was achieved as follows: time 6hrs, original pH about 8. Under these conditions the removal ratio of COD can reach 81.4% and that of BOD can reach 91.5%;but the removal ratio of the TSS and the Chromaticity were low, the removal ratio of TSS only reach 31.8%.
Laboratory Tests on Hydraulic Properties of Municipal Solid Waste
Authors: Song Li Hua
Published: August 2013

In order to analyze the hydraulic properties of municipal solid waste (MSW), laboratory tests on the soil-water characteristic curves of 6 groups of MSW samples with different void ratios and organic contents are performed by means of the unsaturated consolidation apparatus. The filter paper method is also employed to determine their soil-water characteristic curves. The distribution indexλof void size of the samples is analyzed. The results show that the air-entry value of the MSW samples is very small and about 1kPa, and it increases owing to the action of loading. The value ofλ decreases with the increase of the initial void ratio and increases with the increase of the organic content in the samples. For measuring the soil-water characteristic curves of MSW by means of the filter paper method, the values at high suction phase are more rational and significant.
Application of 16S rDNA Ribosomal RNA Approach for the Analysis and Identification of Bacterium in Granular Sludge
Authors: Deng Yao Jie , Song Wen Zhe , Chen Yuan Cai
Published: August 2013

Both Eubacteria and Archaea community diversity and dynamicity were studied during PCP-degrading micro-aerobic granular sludge cultivation using 16S rDNA ribosomal RNA approach. Main bands of DGGE were compared with sequences. The results showed that Eubacteria and Archaea community were closely related to uncultured microorganisms. There were aerobic, micro-aerobic and anaerobic bacterium in micro-aerobic granular sludge simultaneously. After granular sludge was domesticated by PCP, the dominant Eubacteria and Archaea for PCP degradation were related toProteobacteria, Sphingomonas, Methanogenic bacteriumand so on.
Preparation of Calcium Sulfate from Oil-Refining Acid Sludge by Neutralization Method
Authors: Nie Li Jun , Wu Shi Kui , Liu Yang Liu
Published: August 2013

For the purpose of recycling acid sludge of lubricant oil from refinery, on the conditions that the dilution factor is 20 and the actual addition amount of calcium carbonate and calcium hydroxide is respectively 1.15 and 1.1 times of the theoretical value, neutralization method is used to process acid sludge. By means of removing post-reaction organic phase, evaporating, drying, igniting at 650°C for 80 min, dissolving, crystallizing, calcium sulfate product is obtained. The conversion rate of SO42- in acid sludge is more than 75% in the product. The purified product meets the national quality standards for similar products.
Study on Electro-Catalytic Oxidation of Simulant Dye Wastewater Using Ti/SnO2-Sb2O3, Ti/SnO2-Sb2O3 /PbO2-Fe Anodes
Authors: Bao Dong Jie , Liu Zhan Meng , Li Jing
Published: August 2013

The Ti/SnO2-Sb2O3 and Ti/SnO2-Sb2O3/PbO2-Fe electrodes were prepared by thermal decomposition method. Using these two electrodes as anodes, two electro-catalytic oxidation processes were introduced to treat three simulant dye wastewaters, which respectively prepared by the dyes of acid orange II, alizarin red and methylene blue thrihydrate. The results show that these dyes with 100mg/L concentration were degraded by the optimal electrodes. When the current density was 75mA/cm2, the electrolyte concentration was 12g Na2SO4/L, and the degradation time was over 60 minutes, the removal ratio of acid orange II was around 80%, alizarin red was above 65%, and methylene blue thrihydrate was just 45% or so. The results that the removal rates of different dyes were different were explained based on the dyes chemistry structure. It was obtained that the chromophoric group of dye is more complex, the degradation process is more difficult.