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Search Results: 1 - 10 of 18435 matches for " Peng Yongzhen "
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Nitrogen removal via nitrite from municipal landfill leachate

WU Lina,PENG Chengyao,ZHANG Shujun,PENG Yongzhen,

环境科学学报(英文版) , 2009,
Abstract: A system consisting of a two-stage up-flow anaerobic sludge blanket (UASB),an anoxic/aerobic (A/O) reactor and a sequencing batch reactor (SBR),was used to treat landfill leachate.During operation,denitrification and methanogenesis took place simultaneously in the first stage UASB (UASB1),and the effluent chemical oxygen demand (COD) was further removed in the second stage UASB (UASB2).Then the denitrification of nitrite and nitrate in the returned sludge by using the residual COD was accomplished in the A/O reactor,and ammonia was removed via nitrite in it.Last but not least,the residual ammonia was removed in SBR as well as nitrite and nitrate which were produced by nitrification.A system consisting of a two-stage UASB and an A/O reactor was used to achieve the stable short-cut nitrification in the first stage (60 d).The effluent of stage one was treated by SBR in the second stage (60 d).The results over 120 d were as follows: when the total nitrogen (TN) concentration of influent leachate was about 2500 mg/L and the ammonia nitrogen concentration was about 2000 mg/L,the short-cut nitrification with 85%-90% nitrite accumulation was achieved stably in the A/O reactor.The TN and ammonia nitrogen removal efficiencies of the system were 98% and 97%,respectively.The residual ammonia,nitrite and nitrate which were produced by nitrification in the A/O reactor could be washed out almost completely in SBR.The TN and ammonia nitrogen concentrations of final effluent were about 39 mg/L and 12 mg/L,respectively.
Review of biological nitrogen removal enhancement technologies and processes under low C/N ratio

PENG Yongzhen,MA Bin,

环境科学学报 , 2009,
Abstract: Considering the shortage of organic materials for biological nitrogen removal from wastewater under low C/N ratios, two methods are proposed in order to achieve high efficiency of biological nitrogen removal:.making full use of the carbon source and reducing the requirement of carbon source. To make full use of carbon sources, modified biological nitrogen removal process are introduced, including the anoxic/oxic step feeding process and the pulsed SBR process. To reduce the carbon source requirement in biol...
Nitrogen removal in sequencing batch reactor
Wang Fuzhen,Peng Yongzhen,Yu Erjie,Li Baikun,
Wang Fuzhen
,Peng Yongzhen,Yu Erjie,Li Baikun,Chen Aifeng

环境科学学报(英文版) , 1994,
Abstract: This article introduces biodenittification rule of several operation in SBR system. Theresults show that sequencing aeration in SBR meets the needs of oxic and anoxic conditions ofbio-denitrification, and it is a promising bio-denitrification technique. It is the first discover thatduring the treatment of brewery wastewater, when the brewery wastewater is added in the activatedsludge, its denitrinfication rate is faster than methyl alcohol added. This experimental result has greatsignificance. It is suggested that adding original brewery wastewater shall be first considered inbio-denitrification of several kinds of wastewater. Altenlative operation of aeration and mixation,namely nitnfication and denitnfication, has high denitnfication efficiency.
Denitrifying phosphorus removal in A2/O process

Peng Yi,Peng Yongzhen,Wu Changyong,

环境工程学报 , 2008,
Abstract: Anaerobic-anoxic-oxic (A2/O) process is a simple wastewater treatment process that can achieve both nitrogen and phosphorus removal. However, some inherent contradictions, for example, substances competition and SRT problems, make it very difficult to raise the nutrients removal efficiency when treating low C/N ratio wastewater. As a new developed technology, denitrifying phosphorus removal can solve those contradictions to a certain extent, even treating low C/N ratio wastewater. The aims of this work are to exhibit the technique principle of denitrifying phosphorus removal and the latest research in A2/O process with denitrifying phosphorus removal. Some operational strategies are also included to give a total presentation of A2/O process with denitrifying phosphorus removal. The main developmental trends of denitrifying phosphorus removal in A2/O are also discussed here.
Effect of wastewater COD/N ratio on aerobic nitrifying sludge granulation and microbial population shift

Lei Wu,Chengyao Peng,Yongzhen Peng,Lingyun Li,Shuying Wang,Yong Ma,

环境科学学报(英文版) , 2012,
Abstract: The effect of COD/N ratio on the granulation process and microbial population succession was investigated. Four identical sequencing batch reactors, R1, R2, R3 and R4, were operated with various initial COD/N ratios ranging from 0/200 to 800/200 (m/m). Ethanol was fed as the source of COD. Aerobic granules were successfully cultivated in R2 and R3, operating with the COD/N ratio of 200/200 and 400/200, respectively. Scanning electron microscope observations indicated that short rod-shaped and spherical bacteria were dominant in R2, while granules produced in R3 were surrounded with a large amount of filamentous bacteria. The average specific nitritation rate in R2 and R3 were 0.019 and 0.008 mg N/(mg MLVSS.hr), respectively. Fluorescence in situ hybridization results demonstrated that nitrifying bacteria population was enriched remarkably in R2. It indicated that nitrification ability and nitrifying bacteria population were enriched remarkably at low COD/N ratio. However, no granules were formed in R1 and R4 which might attribute to either limited or excessive extracellular polymeric substances production. This study contributed to a better understanding of the role of COD/N ratio in nitrifying sludge granulation.
Nitrous oxide production during nitrogen removal from domestic wastewater in lab-scale sequencing batch reactor

LIU Xiuhong,PENG Yi,WU Changyong,AKIO Takigawa,PENG Yongzhen,

环境科学学报(英文版) , 2008,
Abstract: The production of N2O during nitrogen removal from real domestic wastewater was investigated in a lab-scale aerobic-anoxic sequencing batch reactor with a working volume of 14 L.The results showed that the total N2O-N production reached higher than 1.87 mg/L,and up to 4% of removed nitrogen was converted into N2O.In addition,N2O led to a much higher greenhouse effect than CO2 during aerobic reaction phase,this proved that N2O production could not be neglected.The N2O-N production during nitrification Was 1.85 mg/L,whereas,during denitrification,no N2O was produced,nitrification was the main source of N2O production during nitrogen removal.Furthermore,during denitrification,the dissolved N2O at the end of aeration Was found to be further reduced to N2.Denitrification thus had the potential of controlling N2O production.
Electrochemical dechlorination of chloroform in neutral aqueous solution on palladium/foam-nickel and palladium/polymeric pyrrole film/foam-nickel electrodes
SUN Zhirong,LI Baohu,HU Xiang,SHI Min,HOU Qingnan,PENG Yongzhen,
SUN Zhirong
,LI Baohu,HU Xiang,SHI Min,HOU Qingnan,PENG Yongzhen

环境科学学报(英文版) , 2008,
Abstract: Electrochemical dechlonnafion of chloroform in neutral aqueous solution was investigated using palladium-loaded electrodes at ambient temperature.Palladium/foam-nickel (Pd/foam-Ni) and palladium/polymeric pyrrole film/foam-nickel (Pd/PPy/foam-Ni)composite electrodes which provided catalytic surface for reductive dechiorination of chloroform in aqueous solution were prepared using an electrodepositing method.Scanning electron microscope (SEM) micrographs showed that polymeric pyrrole film modified the electrode-surface characteristics and resulted in the uniform dispersion of needle-shaped palladium particles on foam-Ni supporting electrode.The experimental results of dechlorination indicated that the removal efficiency of chloroform and current efficiency in neutral aqueous solution on Pd/PPy/foam-Ni electrode could be up to 36.8% and 33.0% at dechlorination current of 0.1 mA and dechlorination time of 180 rain,which is much higher than that of Pd/foam-Ni electrode.
Biofilm formation and startup of nitrification biological aeration filter

Wang Jianhu,Chen Yongzhi,Peng Yongzhen,

环境工程学报 , 2010,
Abstract: 近年来,曝气生物滤池广泛应用于污水硝化过程中,硝化型曝气生物滤池应运而生。采用快速排泥挂膜法和自然挂膜法相结合的复合挂膜法,考察了进水是否含有机物对硝化型曝气生物滤池挂膜的影响。在19℃、HRT=55 min、出水DO=8 mg/L、进水NH+4-N约为50 mg/L的条件下,两滤池挂膜启动时间差异较大,进水不含有机物的1#滤池挂膜成功仅需18 d,当其运行稳定时NH+4-N的去除率达到100%;而进水含有机物的2#滤池挂膜成功需24 d,当其运行稳定时,COD和NH+4-N去除率分别为84.6%和91.2%。此结果表明,与含有机物的实际生活污水相比,采用不含有机物的模拟生活污水启动硝化型曝气生物滤池挂膜启动时间可缩短6 d,这主要是由于异氧菌产率系数比硝化菌大。
Degradation characters of aerobic/anoxic sludge digestion

Zhang Yanping,Peng Yongzhen,

环境工程学报 , 2009,
Abstract: A batch experiment was conducted using two self-made reactors to compare aerobic/anoxic digestion with aerobic digestion.Some degradation characters during sludge digestion such as the volatile solid(VS) reduction,the change of pH and alkalinity,COD and nitrogen concentration in supernatant were investigated.Results showed that VS reduction rate of aerobic/anoxic digestion could achieve to 38.2% after 16 days' digestion at normal temperature,which was satisfied with the standard of sludge stabilization.At t...
A/O pilot-scale nitrogen removal process treating domestic wastewater Ⅱ. The study of system characteristics and SND

MA Yong,PENG Yongzhen,YU Deshuang,

环境科学学报 , 2006,
Abstract: The COD, ammonia and total nitrogen (TN) removal efficiency were studied in the paper at low DO concentration in a pilot-scale A/O nitrogen removal plant treating domestic wastewater. The experimental results showed that the COD and ammonia removal efficiency reach 85% and 92%, respectively. Because of the low influent COD/TN ratio (2.93), the average TN removal efficiency was only 64%, while TN removal efficiency could be increased by 12% with the nitrite accumulation ratio increased from 15% to 85%. A good correlation of ammonia removal efficiency, nitrification rate and TN removal efficiency was found. Simultaneous nitrification and denitrification (SND) with nitrite at low DO level could be realized, which contributed to 5%~12% TN nitrogen removal based on nitrogen mass balance. The SND would be damaged with the DO increased, and the mechanism of SND with nitrite was presented.
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