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Enhancing treatment efficiency of swine wastewater by effluent recirculation in vertical-flow constructed wetland

Journal of Environmental Sciences 2006年第2期18卷 221-226页

作者： HE Lian-sheng LIU Hong-liang XI Bei-dou ZHU Ying-bo Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute of Geographical Science and Natural Resource Research Chinese Academy of Sciences Beijing 100101 China

Livestock wastewater has been a major contributor to Chinese cultural eutrophication of surface waters. Constructed wetlands are under study as a best management practice to treat wastewater from dairy and swine operations, but the removal efficiency of pollutants is relatively low. Enhancing the treatment efficiency of livestock wastewater by effluent recirculation was investigated in a pilot-scale vertical-flow constructed wetland. The wetland system was composed of downflow and upflow stages, on which narrow-leaf Phragmites communis and common reed Phragraites Typhia are planted, respectively; each stage has a dimension of 4 m^2 （2 m × 2 m）. wastewater from facultative pond was fed into the system intermittently at a flow rate of 0.4 m^3/d. Recirculation rates of 0, 25%, 50%, 100% and 150% were adopted to evaluate the effect of the recirculation rate on pollutants removal. It shows that with effluent recirculation the average removal efficiencies of NH4-N, biological oxygen demand （BOD5） and suspended solids（SS） obviously increase to 61.7%, 81.3%, and 77.1%, respectively, in comparison with the values of 35.6%, 50.2%, and 49.3% without effluent recirculation. But the improvement of TP removal is slight, only from 42.3% to 48.9%. The variations of NH4-N, dissolved oxygen（DO） and oxidation-reduction potential（ORP） of inflow and outflow reveal that the adoption of effluent recirculation is benefi- cial to the formation of oxide environment in wetland. The exponential relationships with excellent correlation coefficients （R2 〉0.93） are found between the removal rates of NH4-N and BOD5 and the recirculation rates. With recirculation the pH value of the outflow decreases as the alkalinity is consumed by gradually enhanced nitrification process. When recirculation rate is kept constant 100%, the ambient temperature appears to affect NH4-N removal, but does not have significant influence on BOD5 removal.

关键词： vertical-flow constructed wetland swine wastewater effluent recirculation recirculation rate nitrification

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Simultaneous removal of nitrogen and phosphorus from swine wastewater in a sequencing batch biofilm reactor

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Chinese Journal of Chemical Engineering 2015年第1期23卷 303-308页

作者：海热提何一群王晓慧李媛 Center of Environmental Science and Technology Beijing University of Chemical Technology

In this study, the performance of a sequencing batch biofilm reactor(SBBR) for removal of nitrogen and phosphorus from swine wastewater was evaluated. The replacement rate of wastewater was set at 12.5% throughout the experiment. The anaerobic and aerobic times were 3 h and 7 h, respectively, and the dissolved oxygen concentration of the aerobic phase was about 3.95 mg·L-1. The SBBR process demonstrated good performance in treating swine wastewater. The percentage removal of total chemical oxygen demand(COD), ammonia nitrogen(NH4+-N), total nitrogen(TN), and total phosphorus(TP) was 98.2%, 95.7%, 95.6%, and 96.2% at effluent concentrations of COD85.6 mg·L-1, NH4+-N 35.22 mg·L-1, TN 44.64 mg·L-1, and TP 1.13 mg·L-1, respectively. Simultaneous nitrification and denitrification phenomenon was observed. Further improvement in removal efficiency of NH4+-N and TN occurred at COD/TN ratio of 11:1, with effluent concentrations at NH4+-N 18.5 mg·L-1and TN 34 mg·L-1, while no such improvement in COD and TP removal was found. Microbial electron microscopy analysis showed that the filler surface was covered with a thick biofilm, forming an anaerobic–aerobic microenvironment and facilitating the removal of nitrogen, phosphorus and organic matters. A long-term experiment(15 weeks) showed that stable removal efficiency for N and P could be achieved in the SBBR system.

关键词： Sequencing batch biofilm reactor swine wastewater Simultaneous nitrogen and phosphorus removal

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Simultaneous determination of three classes of antibiotics in the suspended solids of swine wastewater by ultrasonic extraction,solid-phase extraction and liquid chromatography-mass spectrometry

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Journal of Environmental Sciences 2011年第10期23卷 1729-1737页

作者： Xun Pan Zhimin Qiang Weiwei Ben Meixue Chen Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

This work describes a systematic approach to the development of a method for simultaneous determination of three classes of veterinary antibiotics in the suspended solids （SS） of swine wastewater, including five sulfonamides, three tetracyclines and one macrolide （tiamulin）. The entire procedures for sample pretreatment, ultrasonic extraction （USE）, solid-phase extraction （SPE）, and liquid chromatography-mass spectrometry （LC-MS） quantification were examined and optimized. The recovery efficiencies were found to be 76%-104% for sulfonamides, 81%-112% for tetracyclines, and 51%--64% for tiamulin at three spiking levels. The intra-day and inter-day precisions, as expressed by the relative standard deviation （RSD）, were below 17%. The method detection limits （MDLs） were between 0.14 and 7.14 μg/kg, depending on a specific antibiotic studied. The developed method was applied to field samples collected from three concentrated swine feeding plants located in Beijing, Shanghai and Shandong province of China. All the investigated antibiotics were detected in both SS and liquid phase of swine wastewater, with partition coefficients （logKd） ranging from 0.49 to 2.30. This study demonstrates that the SS can not be ignored when determining the concentrations of antibiotics in swine wastewater.

关键词： antibiotics swine wastewater suspended solids ultrasonic extraction solid-phase extraction mass spectrometry

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Sorption behavior of tetracyclines on suspended organic matters originating from swine wastewater

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Journal of Environmental Sciences 2018年第3期30卷 144-152页

作者： Yaoyin Lou Zhi-Long Ye Shaohua Chen Xin Ye Yujun Deng Jianqiao Zhang Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China University of Chinese Academy of Sciences Beijing 100049 China

Tetracyclines（TCs） discharged from livestock wastewater have aroused public concerns due to their pharmacological threats to ecosystems and human health. As an important medium in the wastewater, suspended organic matters（SOMs） play vital roles in antibiotics transport and degradation. However, limited information has been reported in the relevant literature. This study investigated TCs sorption behavior on SOM, withdrawn from swine wastewater. High TCs sorption capacities were detected, with the maximum values ranging from 0.337 to 0.679 mg/g. Increasing p H and temperature led to the decline of sorption capacity. Results from three-dimensional excitation–emission matrix fluorescence spectroscopy and Fourier transform infrared spectrometry revealed that amide and carboxyl groups were the main functional groups for TCs adsorption. The interactions between SOM and TCs were clarified as predominated by hydrogen-bonding and cation-exchange in acid conditions, and electrostatic repulsion in neutral or alkaline conditions. Adsorption kinetics modeling was conducted, and a satisfactory fitting was achieved with the Freundlich equation. These results indicated that the adsorption process was a rather complex process, involving a combination of cation-exchange and hydrogen-bonding. The results will provide a better understanding of the capability of SOM for TCs transport and abatement in the wastewater treatment process.

关键词： Tetracycline Suspended organic matters Adsorption swine wastewater

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New concept of contaminant removal from swine wastewater by a biological treatment process

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Frontiers in Biology 2009年第4期4卷 402-413页

作者： Meixue CHEN Rong QI Wei AN Heqing ZHANG Yuansong WEI Yiqi ZHOU State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Pollution from concentrated animal feeding operations(CAFOs)are the most serious pollution source in China now,and swine wastewater contains high concentrations of nutrients such as chemical oxygen demand(COD),biochemical oxygen demand 5(BOD 5),ammonium,and emergent contaminants related to public *** processes are the most popular treatment methods for COD and ammonium *** the low operation cost,easy maintenance and high removal rate of contaminants in recent years,nitrogen removal via nitrite and real-time control processes using oxidation-reduction potential(ORP)and/or pH as parameters to control the aerobic and anaerobic cycles of a system has received much attention for animal wastewater *** the biological treatment process,the emergent contaminants such as estrogen,antibiotics,and disinfec-tion reagents have been the focus of research recently,and degradation bacteria and resistance bacteria have also been extracted from activated *** microbial analysis technique is also advancement in the field of biodegrada-tion bacteria and resistance *** of these advance-ments in research serve to improve wastewater treatment and decrease environmental hazards,especially for using manure as a fertilizer source for crop production.

关键词： contaminants swine wastewater biological treatment

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swine wastewater Treatment with Struvite Precipitation Technology

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Agricultural Science & Technology 2012年第6期13卷 1346-1349页

作者：岳建华环境保护部华南环境科学研究所广东广州510655

[Objective] This study aimed to determine the optimal technical parameters for the swine wastewater treatment by struvite precipitation. [Method] Central composite design （CCD） and response surface method （RSM） were employed to study the effects of struvite precipitation on removing the ammonia nitrogen in the swine wastewater. Quadratic model was developed to describe the mathematical relationships between the investigated factors of pH value, reaction time, magnesium to nitrogen molar ratio （Mg/P）, nitrogen to phosphorus molar ratio （N/P）, the investigated indicators of NH 4 -N removal efficiency and residual PO 4 3 -P concentration. Contour overlay plot was proposed to predict the optimal experimental conditions with the NNH 4 -N removal efficiency of 75% and residual PO 4 3-P concentration of 3.0 mg/L as the desired values. [Result] At pH of 10.0, mixing time of 30 min, Mg/N of 1.11, N/P of 1.14, the NH 4 -N removal efficiency （Y 1 ） was the maximum of 79.0% , and the residual PO 4 3-P concentration （Y 2 ） at this time was 0.35 mg/L. The verification test of the optimal conditions proved that the verification data and model predictions agreed well. [Conclusion] The optimized parameters for the chemical struvite precipitation used to treat swine wastewater with central composite experimental design and response surface method are scientific, rational and efficient.

关键词： Struvite precipitation Response surface method swine wastewater

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Technology Rogress of swine wastewater Treatment from Large-Scale Pig Farms

Technology Rogress of Swine Wastewater Treatment from Large-...

引用

2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Yang Liwei Huang Tinglin Zhou Yuexi Wang Haiyan Zhang Zhaoyue PangZhaohui School of Environmental and Municipal Engineering Xi'an University of Architecture & Technology Environmental Science and Engineering College Chang'an University Research Center of Water Pollution Control Technology Chinese Research Academy of Environmental Sciences

For the large-scale swine wastewater with the characteristics of high concentration of organic matter,suspended solids and more high ammonia nitrogen,odor,complex pollution ingredient and large emissions,combined with Chinese national conditions,adapting conditions and characteristic of the three of back-to-field mode,ecological processing mode and bio-processing mode are ***,it is proposed that the development direction and main problems of the current swine wastewater treatment.

关键词： Intensive Pig Farms swine wastewater Land Spreading Mode Ecological Treatment Mode Biological Treatment Mode

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Design,application and verification of a novel system utilizing bacteria and microalgae to treat swine farm wastewater and produce value-added biomass

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International Journal of Agricultural and Biological Engineering 2023年第4期16卷 222-230页

作者： Xin Zhen Yali Li Jingwen Qiang Manyu Tang Wei Hua Wanqing Wang Shuang Wu Phil Perkins Roger Ruan Yanling Cheng College of Biochemical Engineering Beijing Union UniversityBeijing 100023China Beijing Key Laboratory of biomass waste resource utilization Beijing 100023 China Solaster LLC NashvilleTN 37210USA Center for Biorefining and Department of Bioproducts and Biosystems EngineeringUniversity of MinnesotaSaint PaulMN 55108USA

swine farm wastewater is extremely harmful to the environment if not treated before it is *** this study,a system was developed and optimized for testing the high levels of organic matter in swine farm wastewater utilizing a microalgae/bacteria co-culture combined with a novel closed-loop extraction and dilution ***,the system produces biomass that also could be harvested and used in value-added *** efficacy of biomass as a biofertilizer was demonstrated by using a model plant of *** addition,the analysis of biomass indicates that it also has potential as a source for *** a 20-d cultivation period,a yield of biomass was achieved to 2.063 g/L of *** highest removal rates recorded in steady state conditions were:13.8 mg/L·d of Total Nitrogen(TN);11.5 mg/L·d of Ammonia Nitrogen(NH_(4)^(+)-N);24.8 mg/L·d of Chemical Oxygen Demand(COD);and 16.9 mg/L·d of Total Phosphorus(TP).After cultivation,the composition of the biomass was analyzed on a dry basis;the major components were protein(44.9%),lipids(24.6%),carbohydrates(19.9%),Chlorophyll-A(2.75%),Chlorophyll-B(1.66%),and carotenoids(0.57%).This biomass was diluted with water(5%by weight)and used as a biofertilizer to grow *** results showed that the average root and stem lengths of Arabidopsis were 43.0%and 55.0%longer compared to those of the control ***,the number of leaves and the maximum leaf length increased by 30.2%and 39.7%;and the fresh and dry leaf weights increased by 44.0%and 33.7%,*** results demonstrate the efficacy of this system for treating swine farm wastewater whilst simultaneously producing a value-added microalgae/bacteria *** paper also demonstrated the use of biomass as a fertilizer for cultivating a value-added crop and,based on the compositional analyses,propose that the biomass could be used as a raw material for biofuel production due to its high lipid content of 24.6%.By cons

关键词： bacteria-microalgae swine wastewater environmental impact value-added biomass biofertilizer

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PERFORMANCE OF A PILOT SCALE WETLAND BIOFILTER FOR TREATMENT OF PIG SLURRY

PERFORMANCE OF A PILOT SCALE WETLAND BIOFILTER FOR TREATMENT...

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第4届流域管理和城市供水国际会议

作者： HE Lian-sheng~1 LIU Hong-liang~(1,2) Zhu Yingbo~3 1.Department of Environmental Science and Engineering,Tsinghua University,Beijing,100084,China 2.Chinese Research Academy of Environmental Science,Beijing,100012,China 3.Institute of Geographical Science and Natural Resource Research,CAS.Beijing,100101,China

Animal wastewater has been a major contributor to the eutrophication of surface waters.A small,pilot scalewetland biofilter(WB)system was developed to showcase and evaluate WB as a pig slurry treatment *** systemconsi... 详细信息

关键词： Wetland biofilter swine wastewater Nitrification Pretreatment Intermittent aeration

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