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Study on Piggery Anaerobic Fermentation Slurry Treated by Anoxic/Oxic Process 被引量:3
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作者 李卓坪 牛明芬 +1 位作者 刘知远 侯迎 《Agricultural Science & Technology》 CAS 2009年第6期155-158,共4页
[Objective] The aim of this study was to provide a fast, stable and efficient piggery wastewater processing technology. [Method] The start-up process was studied through the experiment of piggery anaerobic fermentatio... [Objective] The aim of this study was to provide a fast, stable and efficient piggery wastewater processing technology. [Method] The start-up process was studied through the experiment of piggery anaerobic fermentation slurry treated by Anoxic/Oxic (A/O) reactor. The process was divided into two stages: at the first stage, dominant micro flora were cultivated in Anoxic and Oxic reaction tanks respectively; at the second stage. Anoxic and Oxic reaction tanks were initiated jointly to gradually enhance water load and continued to cultivate and domesticate microorganisms, and finally the start-up process was completed. [ Result] The results showed that return mixture ratio and return sludge ratio was 2 and 1 respectively when the temperature reached 32 ±2 ℃. However. when aeration rate of Oxic reaction amounted to 0.5 m^3/h, the re- moval rate of COD and NH4^+ -H were 89.87% and 89.31% respectively through practical operation within 50 days, which indicated that the start- up process through A/O reactor was successful. Conclusion This study can provide a scientific basis and reference for innocuous technique of piggery anaerobic fermentation slurry treatment. 展开更多
关键词 Piggery wastewater anoxic/Oxic (A/O) reactor COD NH4^+ -H
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Kinetics model of aerobic phase in hybrid anoxic-oxic process
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作者 孙慧丽 陈志强 +1 位作者 姜涛 吕炳南 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第2期161-165,共5页
Kinetics models of COD degradation,biomass growth of the anoxic-oxic ( A/O) system as well as NH3-N degradation in aerobic phase were presented according to the mass balance theory,reaction-diffusion theory and Fick l... Kinetics models of COD degradation,biomass growth of the anoxic-oxic ( A/O) system as well as NH3-N degradation in aerobic phase were presented according to the mass balance theory,reaction-diffusion theory and Fick law. Then these models were testified by comparson with experimental results. It is demonstrated that the variation trends of theoretical and experimental values for COD degradation and biomass growth are similar. The deviation rate between theoretical and experimental values is always under 20% even it increases along with the fluctuation of influent organic loading. In terms of NH3-N degradation,nitrification can also be well simulated by the model as the substrates of influent are sufficient. It indicates that the model can accurately reflect the reaction in hybrid A/O process. Models presented herein provide a theoretical basis for the design, operation and control of hybrid A/O process. 展开更多
关键词 hybrid anoxic-oxic process aerobic phase anoxic phase kinetics model testify
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Real-time control of aerobic/anoxic digestion for waste activated sludge
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作者 张艳萍 彭永臻 +1 位作者 王淑莹 汪苹 《Journal of Beijing Institute of Technology》 EI CAS 2011年第1期138-142,共5页
Experiments were conducted to study the performance characters of aerobic/anoxic (A/ A) digestion of sludge at 30± 1 ℃, while the sludge retention time (SRT) was kept 16 d. The varia tions of oxidation redu... Experiments were conducted to study the performance characters of aerobic/anoxic (A/ A) digestion of sludge at 30± 1 ℃, while the sludge retention time (SRT) was kept 16 d. The varia tions of oxidation reduction potential (Eh ) and pH were continuously monitored during the A/A di gestion and the conversions of ammonium and nitrate were investigated. Important features on both Eh and pH profiles were identified to develop process control strategy. Since the feature point on Eh profile where d2 Eh/dt^2 =0 is very stable during anoxic cycle, it can be used to determine the end of denitrification. The end of nitrification can be identified according to dpH/dt = 0. A real-time control strategy of A/A digestion of sludge was developed and tested with pH and Eh as control parameters. It is shown that the performance of the real-time control strategy is better than that of a fixed time control strategy. While the real time controlled A/A digestion system can achieve a similar volatile suspended solids (VSS) destruction efficiency of 35.2 % as a continuously aerated system, it im proves the supernatant quality in a shorter aeration time(7. 75 d for a 20 d period). 展开更多
关键词 aerobic/anoxic digestion real time control waste activated sludge volatile suspendedsolids(VSS) reduction
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Electricity Generation Performance of Microbial Fuel Cell Embedded in Anaerobic-Anoxic-Oxic Wastewater Treatment Process
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作者 Bowei Li Wenbo Dong +2 位作者 Bojie Liu Beizhen Xie Hong Liu 《Journal of Biosciences and Medicines》 2015年第9期32-37,共6页
Microbial fuel cell (MFC) embedded in anaerobic-anoxic-oxic (A2/O) process has positive effects on wastewater treatment, which can enhance the efficiencies of pollutants’ removal, along with electricity production. B... Microbial fuel cell (MFC) embedded in anaerobic-anoxic-oxic (A2/O) process has positive effects on wastewater treatment, which can enhance the efficiencies of pollutants’ removal, along with electricity production. But the electricity generation performance and its optimization of MFC embedded in A2O process still needs to be further investigated. In this study, in order to optimize the contaminants removal and electricity production of the MFC-A2/O reactor, a lab-scale corridor-style MFC-A2/O reactor, which could simulate the practical A2/O biological reactor better, was designed and operated. The removal efficiencies of chemical oxygen demand, total nitrogen and total phosphorus were continuously monitored so as the electricity generation. In addition, the influences of the structural parameters’ changes of MFC on the output voltage, including electrode material, the directly connected area and the distance between electrodes, were also studied. The results elucidated that the effluent quality of A2/O reactor could be improved when MFC was embedded, and all the investigated structural factors were closely related to the electricity generation performance of MFC to some extent. 展开更多
关键词 MICROBIAL Fuel Cell Anaerobic-anoxic-Oxic MFC-A2/O reactor Directly CONNECTED Area The Distance between ELECTRODES
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Characteristics of extracellular fluorescent substances of aerobic granular sludge in pilot-scale sequencing batch reactor 被引量:8
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作者 涂响 苏本生 +1 位作者 李小宁 竺建荣 《Journal of Central South University》 SCIE EI CAS 2010年第3期522-528,共7页
The aerobic granular sludge was cultivated in a pilot-scale sequencing batch reactor (SBR), and some of the granules were stored at 8 ℃ for 150 d. Extracellular polymeric substances (EPS) of sludge samples were e... The aerobic granular sludge was cultivated in a pilot-scale sequencing batch reactor (SBR), and some of the granules were stored at 8 ℃ for 150 d. Extracellular polymeric substances (EPS) of sludge samples were extracted and analyzed during the granulation and storage process. The results show that the contents of protein and EPS increase along with the granulation process, while polysaccharides remain almost unchanged. The content of protein in EPS is almost two-fold larger than that of polysaccharides in granular sludge cultivated with municipal wastewater. Moreover, some of the granules disintegrate during storage, corresponding to the decrease of protein contents in EPS. Three peaks are identified in three-dimensional excitation emission matrix (EEM) fluorescence spectra of the EPS in the aerobic granules. Two peaks (A and B) are attributed to the protein-like fluorophores, and the third (peak C) is related to visible fulvic-like substances. Peak A gradually disappears during storage, while a new peak related to ultraviolet fulvic acid (peak D) is formed. The formation and the stability of aerobic granules are closely dependent on the quantity and composition of EPS proteins. Peak C has no obvious changes during granulation, while the fulvic-like substances present an increase in fluorescence intensities during storage, accompanied with an increase in structural complexity. The fulvie-like substances are also associated with the disintegration of the aerobic granules. 展开更多
关键词 aerobic granules extracellular polymeric substances (EPS) protein fulvic acid sequencing batch reactor (SBR) excitation emission matrix fluorescence spectroscopy
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Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes:Effect of number of stages and bioreactor type 被引量:1
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作者 Banafsheh Azimi Elham Abdollahzadeh-Sharghi Babak Bonakdarpour 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第11期228-239,共12页
In this study,the effect of number of stages and bioreactor type on the removal performance of a sequential anaerobic-aerobic process employing activated sludge for the treatment of a simulated textile dyeing wastewat... In this study,the effect of number of stages and bioreactor type on the removal performance of a sequential anaerobic-aerobic process employing activated sludge for the treatment of a simulated textile dyeing wastewater containing three commercial reactive azo dyes was considered.Two stage processes performed better than one stage ones,both in terms of overall organic and color removal,as well as the higher contribution of anaerobic stage to the overall removal performance,thereby making them a more energy efficient option.The employment of a moving bed sequencing batch biofilm reactor,which uses both suspended and attached biomass,for the implementation of the anaerobic stage of the process,was compared with a sequencing batch reactor that only employs suspended biomass.The results showed that,although there was no meaningful difference in biomass concentration between the two bioreactors,the latter reactor had better performance in terms of chemical oxygen demand(COD)removal efficiency and rate and color removal rate.Further exploratory tests revealed a difference between the roles of suspended and attached bacterial populations,with the former yielding better color removal whilst the latter had better COD removal performance.The sequential anaerobic–aerobic process,employing an aerobic membrane bioreactor in the aerobic stage resulted in COD and color removal of 77.1±7.9%and 79.9±1.5%,respectively.The incomplete COD and color removal was attributed to the presence of soluble microbial products in the effluent and the autoxidation of dye reduction metabolites,respectively.Also,aerobic partial mineralization of the dye reduction metabolites,was experimentally observed. 展开更多
关键词 WASTEWATER ANaerobic aerobic Anaerobic moving bed sequencing batch biofilm reactor Anaerobic sequencing batch reactor aerobic membrane bioreactor
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ATP content and biomass activity in sequential anaerobic/aerobic reactors 被引量:1
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作者 陈红 《Journal of Zhejiang University Science》 EI CSCD 2004年第6期727-732,共6页
Specific ATP content of volatile solids was measured to characterize the sludge activity in a sequential anaerobic/aerobic wastewater treatment system, with an upflow anaerobic sludge blanket (UASB) reactor and a thre... Specific ATP content of volatile solids was measured to characterize the sludge activity in a sequential anaerobic/aerobic wastewater treatment system, with an upflow anaerobic sludge blanket (UASB) reactor and a three-phase aerobic fluidized bed (AFB) reactor. The wastewater COD level was 2000-3000 mg/L in simulation of real textile wastewater. The ATP content and the specific ATP contents of volatile solids at different heights of the UASB reactor and those of the suspended and immobilized biomass in the AFB reactor were measured. In the UASB reactor, the maximum value of specific ATP (0.85 mg ATP/g VS) was obtained at a hydraulic retention time (HRT) 7.14 h in the blanket solution. In the AFB reactor, the specific ATP content of suspended biomass was higher than that of immobilized biomass and increased with hydraulic retention time reaching a maximum value of 1.6 mg ATP/g VS at hydraulic retention time 4.35 h. The ATP content of anaerobes in the UASB effluent declined rapidly under aerobic conditions following a 2nd-order kinetic model. 展开更多
关键词 ATP Biomass activity Sequential anaerobic/aerobic UASB reactor AFB reactor
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Characteristics of aerobic granules grown on glucose a sequential batch shaking reactor
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作者 CAIChun-guang ZHUNan-wen +2 位作者 LIUJun-shen WANGZhen-peng CAIWei-min 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第4期624-626,共3页
Aerobic heterotrophic granular sludge was cultivated in a sequencing batch shaking reactor(SBSR) in which a synthetic wastewater containing glucose as carbon source was fed. The characteristics of the aerobic granules... Aerobic heterotrophic granular sludge was cultivated in a sequencing batch shaking reactor(SBSR) in which a synthetic wastewater containing glucose as carbon source was fed. The characteristics of the aerobic granules were investigated. Compared with the conventional activated sludge flocs, the aerobic granules exhibit excellent physical characteristics in terms of settleability, size, shape, biomass density, and physical strength. Scanning electron micrographs revealed that in mature granules little filamentous bacteria could be found, rod-shaped and coccoid bacteria were the dominant microorganisms. 展开更多
关键词 aerobic granulation sequential batch reactor granule characteristics
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Biological Nitrogen and COD Removal of Nutrient-Rich Wastewater Using Aerobic and Anaerobic Reactors
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作者 Florante A. MAGNAYE Pag-asa D. GASPILLO Joseph L. AURESENIA 《Journal of Water Resource and Protection》 2009年第5期376-380,共5页
A preliminary study on nitrogen and organic removal efficiency of a lab-scale system using aerobic and an-aerobic reactors was performed. A simulated wastewater containing elevated levels of nitrogen was used. This pa... A preliminary study on nitrogen and organic removal efficiency of a lab-scale system using aerobic and an-aerobic reactors was performed. A simulated wastewater containing elevated levels of nitrogen was used. This paper aims to compare the efficiency of aerobic and anaerobic reactors in achieving nitrogen and chemical oxygen demand (COD) removal of nutrient-rich wastewater. It also presents the start-up experi-mentation conducted on simulated wastewater using two different reactors configured as aerobic and anaero-bic. Start-up experiments were carried out using a 5-liter acrylic aerobic reactor and a 4-liter flask anaerobic reactor containing activated sludge taken from De La Salle University (DLSU) wastewater treatment plant as a source of inoculum. Simulated wastewater was continuously fed to the two reactors and the time course of biomass growth was monitored by measuring the biomass concentration represented by mixed liquor volatile solids (MLVS). The time course of organic pollutant reduction by measuring the chemical oxygen demand (COD) was conducted until steady state condition was reached. On the other hand, COD and nitrogen tests such as Ammonia nitrogen (NH3-N), Nitrite nitrogen (NO2--N), Nitrate nitrogen (NO3--N) were also per-formed using 5 batch aerobic reactors containing different concentrations of wastewater and a single batch anaerobic reactor to see the effect of different feed concentrations in the removal of nitrogen. Preliminary results showed that 98% reduction in COD was obtained in aerobic reactor, as supported by increasing con-centration of MLVS, with a hydraulic retention time (HRT) of 5 hours after 11 days while 34% reduction in COD was obtained in anaerobic reactor with the same HRT after 14 days. 展开更多
关键词 COD MLVS HRT aerobic ANaerobic reactors
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Function of anaerobic portion in a conventional sequencing batch reactor
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作者 Yu Hangqing School of Civil & Structural Engineering,Nanyang Technological University,639798,SingaporeGu Guowei Song Lepin School of Environmental Engineering,Tongji University,Shanghai 200092,China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1997年第1期27-39,共13页
The performance of SBRs treating two kinds of wastewater(synthetic wastewater con- taining polyvinyl alcohol and effluent from a coke-plant wastewater treatment system)was investi- gated in this study,in order to exam... The performance of SBRs treating two kinds of wastewater(synthetic wastewater con- taining polyvinyl alcohol and effluent from a coke-plant wastewater treatment system)was investi- gated in this study,in order to examine the exact function of anaerobic portion in a conventional SBR.The set up of 4-or 8-hour anaerobic mixing period in a SBR's cycle did not benefit for PVA degradation.While an anaerobic reactor seeded with anaerobic sludge could partly hydrolyse and acidify PVA into readily-degradable intermediates.During the anaerobic fill period of an SBR treat- ing the effluent from a coke-plant wastewater treatment system,the organic concentration was re- duced to certain extent due to the adsorption of activated sludge and dilution of the mixed liquor from the previous cycle.Parts of readily-degradable organics in the influent were utilised by denitri- fiers as carbon source.The biomass in a conventional SBR was alternatively imposed to aerobic and anaerobic conditions in its operating cycle,the environmental conditions needed for anaerobic hy- drolization and acidification of refractory organics could not occur in such an SBR. 展开更多
关键词 sequencing batch reactor(SBR) anaerobic(aerobic)fill polyvinyl alcohol(PVA)degradation coke-plant wastewater.
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Performance of Sequencing Biofilm Batch Reactor(SBBR) under Micro-aerobic Condition for Aniline-Contaminated Wastewater Treatment
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作者 祁佩时 陈洪一 刘云芝 《Journal of Donghua University(English Edition)》 EI CAS 2014年第3期325-329,共5页
The performance of sequencing biofilm batch reactor( SBBR) under micro-aerobic condition for aniline-contaminated wastewater treatment was investigated in this study. Dissolved oxygen( DO) and aniline concentrations w... The performance of sequencing biofilm batch reactor( SBBR) under micro-aerobic condition for aniline-contaminated wastewater treatment was investigated in this study. Dissolved oxygen( DO) and aniline concentrations were selected as the operating variables to analyze,model,and optimize the process. In order to analyze the process,5 dependent parameters,chemical oxygen demand( COD),aniline,ammonium,total nitrogen( TN),and total phosphorous( TP) removal as the process responses were studied. From the results, increase in DO concentration could promote the removal of COD,aniline,ammonium,and TN,while increase in aniline concentration has a slightly negative impact on the removal of pollutants. The optimum DO concentration was found to be 0. 4-0. 5 mg /L. The removal efficiencies for COD,aniline,ammonium,and TN at the optimum point( DO concentration0. 5 mg /L,aniline concentration 11 mg /L) were 95. 84%,100%,75. 72%,and 45. 39%,respectively. The oxidative deamination was the main degradation method for aniline under micro-aerobic condition. Simultaneously nitrification-denitrification( SND)process performed under micro-aerobic condition and about 20%-40% nitrogen was removed by SND. 展开更多
关键词 ANILINE micro-aerobic condition sequencing biofilm batch reactor(SBBR) dissolved oxygen(DO) concentration
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Removal of nitrogen and phosphorus in a combined A^2/O-BAF system with a short aerobic SRT 被引量:15
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作者 DING Yong-wei WANG Lin +1 位作者 WANG Bao-zhen WANG Zheng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第6期1082-1087,共6页
A bench-scale anaerobic/anoxic/aerobic process-biological aerated filter (A^2/O-BAF) combined system was carded out to treat wastewater with lower C/N and C/P ratios. The A^2/O process was operated in a short aerobi... A bench-scale anaerobic/anoxic/aerobic process-biological aerated filter (A^2/O-BAF) combined system was carded out to treat wastewater with lower C/N and C/P ratios. The A^2/O process was operated in a short aerobic sludge retention time (SRT) for organic pollutants and phosphorus removal, and denitrification. The subsequent BAF process was mainly used for nitrification. The BAF effluent was partially returned to anoxic zone of the A^2/O process to provide electron acceptors for denitrification and anoxic P uptake. This unique system formed an environment for reproducing the denitdfying phosphate-accumulating organisms (DPAOs). The ratio of DPAOs to phosphorus accumulating organisms (PAOs) could be maintained at 28% by optimizing the organic loads in the anaerobic zone and the nitrate loads into the anoxic zone in the A^2/O process. The aerobic phosphorus over-uptake and discharge of excess activated sludge was the main mechanism of phosphorus removal in the combined system. The aerobic SRT of the A^2/O process should meet the demands for the development of aerobic PAOs and the restraint on the nitrifiers growth, and the contact time in the aerobic zone of the A^2/O process should be longer than 30 min, which ensured efficient phosphorus removal in the combined system. The adequate BAF effluent return rates should be controlled with 1--4 mg/L nitrate nitrogen in the anoxic zone effluent of A^2/O process to achieve the optimal nitrogen and phosphorus removal efficiencies. 展开更多
关键词 nitrogen and phosphorus removal denitrifying phosphorus removal denitrifying phosphorus accumulating organisms (DPAOs) anaerobic/anoxic/aerobic process (A^2/O) biological aerated filter (BAF) aerobic sludge retention time (SRT)
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Molecular characterization of bacterial community in aerobic granular sludge stressed by pentachlorophenol 被引量:4
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作者 LIU, He LI, Guangwei +1 位作者 LI, Xiufen CHEN, Jian 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第10期1243-1249,共7页
To characterize the effects of pentachlorophenol (PCP) on the performance and microbial community of aerobic granular sludge in sequencing batch reactor (SBR), the web-based terminal restriction fragment length polymo... To characterize the effects of pentachlorophenol (PCP) on the performance and microbial community of aerobic granular sludge in sequencing batch reactor (SBR), the web-based terminal restriction fragment length polymorphism (T-RFLP) and real-time PCR (RT- PCR) techniques were used to explore the bacterial community structure. When PCP increased from 0 to 50 mg/L, the COD removal rate changed little, while the ammonia removal rate dropped from 100% to 64.9%. The results of molecular characterization showed t... 展开更多
关键词 aerobic granular sludge bacterial community real-time PCR terminal restriction fragment length polymorphism sequencing batch reactor pentachlorophenol (PCP)
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A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage 被引量:1
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作者 Lin Cao Rong Sun +5 位作者 Wenyi Dong Hongjie Wang Zhongyi Dai Xue Wang Jin Xie Hua Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第2期758-768,共11页
To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was developed.The reactor was used to treat actual domestic sewage and th... To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was developed.The reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone(R zone)was investigated during the long-term operation.The best performance was obtained at the R zone’s Oxidation-Reduction Potential(ORP)of-50±30 mV and hydraulic residence times(HRT)of 1.2 hr.The average effluent COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N of the R-MAO process were 18.0±2.3,7.5±0.6,1.0±0.5 and 4.6±0.4 mg/L,respectively,with the corresponding removal efficiency of COD,TN and NH_(4)^(+)-N were 92.9%±1.0%,84.1%±1.5% and 97.5%±1.1%.Compared to the sole MAO system,the TN removal efficiency of the R-MAO increased by 10.1%.Besides,under the optimal conditions,the contribution of the R zone in the R-MAO that removal COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N were 0.36,0.15,0.032 and 0.82 g/day.High-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae(5.20%),OLB8(1.04%)and Ottowia(1.03%)played an important role in denitrification in the R zone.This study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment. 展开更多
关键词 Advanced nitrogen removal Multistage anoxic/aerobic process Sludge regeneration zone(R zone) Microbial community
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新型多格室粪便堆肥反应器设计与试验
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作者 刘建伟 葛静芸 +1 位作者 田洪钰 史世强 《中国农机化学报》 北大核心 2024年第1期223-228,共6页
针对常规粪便堆肥反应器进料自动化程度不高、堆肥效率低和产物质量差的问题,设计并构建出一种“连续进料—反应—出料”运行模式的新型多格室粪便堆肥反应器。对反应器的通风单元、加热单元进行优化设计,并以厕所粪便为处理对象,进行... 针对常规粪便堆肥反应器进料自动化程度不高、堆肥效率低和产物质量差的问题,设计并构建出一种“连续进料—反应—出料”运行模式的新型多格室粪便堆肥反应器。对反应器的通风单元、加热单元进行优化设计,并以厕所粪便为处理对象,进行反应器运行性能试验。试验结果表明,经反应器堆肥处理后,粪便臭味减弱、颜色由棕黄色变为棕褐色,堆料高温期(≥50℃)维持在6 d以上,反应器不同运行阶段堆肥产品的种子发芽指数分别为104%、81%和128%,表明堆肥成品已实现完全腐熟和无害化。堆肥产品总养分、有机质和种子发芽指数均达到相关要求。 展开更多
关键词 多格室堆肥反应器 厕所粪便 好氧堆肥 反应器 资源化
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Effect of nitrate concentration on filamentous bulking under low level of dissolved oxygen in an airlift inner circular anoxic-aerobic incorporate reactor 被引量:2
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作者 Yiming Su Yalei Zhang +1 位作者 Xuefei Zhou Ming Jiang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第9期1736-1744,共9页
This laboratory research investigated a possible cause of filamentous bulking under low level of dissolved oxygen conditions (dissolved oxygen value in aerobic zone maintained between 0.6-0.8 mgO2 /L) in an airlift ... This laboratory research investigated a possible cause of filamentous bulking under low level of dissolved oxygen conditions (dissolved oxygen value in aerobic zone maintained between 0.6-0.8 mgO2 /L) in an airlift inner-circular anoxic-aerobic reactor. During the operating period, it was observed that low nitrate concentrations affected sludge volume index significantly. Unlike the existing hypothesis, the batch tests indicated that filamentous bacteria (mainly Thiothrix sp.) could store nitrate temporarily under carbon restricted conditions. When nitrate concentration was below 4 mg/L, low levels of carbon substrates and dissolved oxygen in the aerobic zone stimulated the nitrate-storing capacity of filaments. When filamentous bacteria riched in nitrate reached the anoxic zone, where they were exposed to high levels of carbon but limited nitrate, they underwent denitrification. However, when nonfilamentous bacteria were exposed to similar conditions, denitrification was restrained due to their intrinsic nitrate limitation. Hence, in order to avoid filamentous bulking, the nitrate concentration in the return sludge (from aerobic zone to the anoxic zone) should be above 4 mg/L, or alternatively, the nitrate load in the anoxic zone should be kept at levels above 2.7 mg NO-3N/g SS. 展开更多
关键词 anoxic-aerobic system low dissolved oxygen filamentous bulking low nitrate concentration nitrate-storing capacity
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一体化厌氧-变级数缺氧/好氧循环流污水处理装置中试研究
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作者 姚望 蒋剑虹 +1 位作者 唐清畅 翟云波 《湖南师范大学自然科学学报》 CAS 北大核心 2024年第4期97-103,142,共8页
针对现有村镇污水处理技术与装备的不足,开发出适用于村镇污水处理的新型一体化厌氧-变级数缺氧/好氧循环流(A-(AO)_n)同步脱氮除磷、沉淀分离技术与装备,以长沙某污水提升泵站沉砂池的出水作为处理对象开展中试实验。对好氧区不同溶解... 针对现有村镇污水处理技术与装备的不足,开发出适用于村镇污水处理的新型一体化厌氧-变级数缺氧/好氧循环流(A-(AO)_n)同步脱氮除磷、沉淀分离技术与装备,以长沙某污水提升泵站沉砂池的出水作为处理对象开展中试实验。对好氧区不同溶解氧、填料填充比和分区进水条件下装置污水处理效能的变化进行研究,结果表明:当好氧区溶解氧控制在1.5~2.0 mg/L,好氧区填料填充比为30%时,装置的脱氮除磷效果最佳。在不外加碳源且不投加化学除磷药剂的条件下,出水水质优于《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。高通量测序结果显示,好氧区投加悬浮球填料后,系统中微生物总量和多样性明显提高,为系统中发生同步硝化反硝化(SND)现象创造了条件。 展开更多
关键词 生活污水 一体化设备 变级数缺氧/好氧循环流工艺 脱氮除磷
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好氧反硝化细菌Burkholderia sp.ZH8的脱氮特性与生物强化作用
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作者 李艳丽 杨垒 +3 位作者 张志昊 李玉彩 孟红艳 任勇翔 《中国环境科学》 EI CAS CSCD 北大核心 2024年第8期4282-4291,共10页
针对传统生物脱氮处理含氮废水工艺流程复杂、脱氮效率低的问题,从实验室运行稳定的生物滤池筛选得到一株好氧反硝化菌株ZH8,该菌株具有较强的异养硝化和好氧反硝化能力.通过形态学、生理生化特征及16S rDNA序列分析,鉴定菌株ZH8为伯克... 针对传统生物脱氮处理含氮废水工艺流程复杂、脱氮效率低的问题,从实验室运行稳定的生物滤池筛选得到一株好氧反硝化菌株ZH8,该菌株具有较强的异养硝化和好氧反硝化能力.通过形态学、生理生化特征及16S rDNA序列分析,鉴定菌株ZH8为伯克氏菌(Burkholderia sp.).单因素试验表明,好氧反硝化菌株ZH8的最佳培养条件为:碳源为丁二酸钠,C/N为15,温度为30℃,转速为160r/min和pH值为7~8.此外,菌株ZH8不仅能以NH_(4)^(+)-N、NO_(3)^(-)-N或NO_(2)^(-)-N分别为单一氮源进行生长,而且在混合氮源条件下也可实现同步硝化反硝化作用.通过全基因组分析,菌株ZH8的异养硝化脱氮为谷氨酸脱氢酶途径的铵同化过程,好氧反硝化途径为:NO_(3)^(-)-N→NO_(2)^(-)-N→NO→N_(2)O→N_(2),碳代谢途径包括三羧酸循环、乙醛酸循环、糖酵解和戊糖磷酸.在采用纯菌ZH8为菌种培养的生物膜反应器中,反应运行至8~15d即可完成挂膜,系统可维持高效稳定的脱氮性能,NH_(4)^(+)-N、NO_(3)^(-)-N及TN的去除率均可达到90%以上.该菌株为生物处理领域提供了新型菌种资源,能够有效处理含氮废水,具有实际应用价值. 展开更多
关键词 异养硝化 好氧反硝化 脱氮途径 生物强化 生物膜反应器
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好氧颗粒污泥快速成粒的影响因素及在连续流反应器研究进展
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作者 李轩杰 王文明 +3 位作者 张芷琪 李惠平 甘沛民 杨殿海 《应用化工》 CAS CSCD 北大核心 2024年第6期1372-1376,1397,共6页
从水力选择压、交替的盛宴-饥荒期间、接种污泥种类、微生物生长基质组成4个方面综述了影响好氧颗粒污泥的快速成粒因素。并结合以上因素综述了基于连续流反应器的好氧颗粒污泥培养的研究进展。介绍了现有AGS研究的局限性并对未来发展... 从水力选择压、交替的盛宴-饥荒期间、接种污泥种类、微生物生长基质组成4个方面综述了影响好氧颗粒污泥的快速成粒因素。并结合以上因素综述了基于连续流反应器的好氧颗粒污泥培养的研究进展。介绍了现有AGS研究的局限性并对未来发展方向提出建议。 展开更多
关键词 污水处理 好氧颗粒污泥 连续流反应器 快速成粒
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曝气方式对AFBBR处理污水过程中脱氮性能的影响
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作者 焦梦 刘晶晶 +1 位作者 孙小沛 任杰辉 《市政技术》 2024年第8期221-228,共8页
探索了曝气强度、曝气孔间距和曝气孔径对好氧流化床生物膜反应器(aerobic fluidized bed biofilm reactor,AFBBR)内污水脱氮效率、脱氮速率、微生物群落组成及脱氮功能微生物相对丰度的影响,揭示了不同曝气方式条件下污水脱氮机理。结... 探索了曝气强度、曝气孔间距和曝气孔径对好氧流化床生物膜反应器(aerobic fluidized bed biofilm reactor,AFBBR)内污水脱氮效率、脱氮速率、微生物群落组成及脱氮功能微生物相对丰度的影响,揭示了不同曝气方式条件下污水脱氮机理。结果表明,在曝气强度5.77 m^(3)/(h·m^(3))、曝气孔间距10 mm和曝气孔径0.27 mm条件下氨氮和总氮的去除率较高,可达到75.0%和70.6%;在曝气强度5.77 m^(3)/(h·m^(3))和曝气孔间距10 mm条件下标准氧传质效率(SOTE)和氧利用率(E)较高,且较小曝气孔径条件下氧气充氧性能较佳;曝气方式影响了同步硝化反硝化速率(SND)、硝化速率(NR)和反硝化速率(DNR),改变了脱氮效率及硝氮和亚硝氮质量浓度;在曝气孔间距10 mm和曝气孔径0.27 mm条件下SND、NR和DNR均达到最高,分别为78.8%、4.9×10^(-4)mg/(h·mg)和4.6×10^(-4)mg/(h·mg),而在曝气强度5.77 m^(3)/(h·m^(3))条件下仅DNR达到最大值;AFBBR系统中共检测出16种脱氮微生物,且反硝化细菌相对丰度显著高于氨氧化细菌和亚硝酸氧化细菌;合适的曝气方式通过形成合适的氧环境条件,提高了Proteobacteria门类中具有脱氮功能的微生物(反硝化细菌)丰度,实现了污水的高效脱氮。合适的曝气强度、曝气孔间距和曝气孔径设计有助于提高AFBBR系统的脱氮性能。 展开更多
关键词 曝气方式 AFBBR 污水 脱氮性能 微生物
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