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Novel strategy of nitrogen removal from domestic wastewater using pilot Orbal oxidation ditch

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Journal of Environmental Sciences 2006年第5期18卷 833-839页

作者： GAO Shou-you peng yong-zhen WANG Shu-ying YAN Jun School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China. College of Environmental and Energy Engineering Beijing University of Technology Beijing 100022 China

A pilot-scale Orbed oxidation ditch was operated for 17 months to optimize nitrogen removal from domestic wastewater of average COD to total nitrogen ratio of 2.7, with particular concern about the roles of dissolved oxygen （DO）, mixed liquor suspended solids （MLSS） and return activated sludge （RAS） recycle ratio. Remarkable simultaneous nitrification and denitrification （SND） was observed and mean total nitrogen （TN） removal efficiency up to 72.1% was steadily achieved, at DO concentration in the out, middle and inner channel of 0.1, 0.4 and 0.7 mg/L, respectively, with an average M LSS of 5.5 g/L and RAS recycle ratio of 150%. Although the out channel took the major role in TN removal, the role of middle channel should never be ignored. The denitrification potential could be fully developed under low DO, high MLSS with adequate RAS ratio. The sludge settleability was amazingly improved under low DO operation mode, and some explanations were tried. In addition, a scries of simplified batch tests were done to determine whether novel microorganisms could make substantial contribution to the performance of nitrogen removal. The results indicated that the SND observed in this Orbal oxidation ditch was more likely a physical phenomenon.

关键词： nitrogen removal simultaneous nitrification and denitrification low DO MLSS novel bacterial

Applying real-time control to enhance the performance of nitrogen removal in CAST system

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Journal of Environmental Sciences 2005年第5期17卷 736-739页

作者： WANG Shao-po peng yong-zhen WANG Shu-ying GAO Shou-you Key Laboratory of Beijing for Water Quality Scienee and Water Environment Recovery Engineering Beijing University of Technology Beijing 100022 China College of Municipal and Envionmental Engineering. Harbin Institute of Technology Harbin 150008 China

A bench-scale reactor（72 L） red with domestic sewage, was operated more than 3 months with three operation modes： traditional mode, modified mode and real-time control mode, so as to evaluate effects of the operation mode on the system performance and to develop a feasible control strategy. Results obtained from fixed-time control study indicate that the variations of the pH and oxidation-reduction potential（ORP） profiles can represent dynamic characteristics of system and the cycle sequences can be controlled and optimized by the control points on the pH and ORP profiles. A control strategy was, therefore, developed and applied to real-time control mode. Compared with traditional mode, the total nitrogen（TN） removal can be increased by approximately 16% in modified mode and a mean TN removal of 92% was achieved in real-time control mode. Moreover, approximately 12.5% aeration energy was saved in real- time control mode. The result of this study shows that the performance of nitrogen removal was enhanced in modified operation mode. Moreover, the real-time control made it possible to optimize process operation and save aeration energy.

关键词： cyclic activated sludge technology biological nitrogen removal real-time control oxidation-reduction potential(ORP)

Characteristics of anoxic phosphors removal in sequence batch reactor

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Journal of Environmental Sciences 2007年第7期19卷 776-782页

作者： WANG Ya-yi PAN Mian-li YAN Min peng yong-zhen WANG Shu-ying College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310014 China. Key Lab of Beijing for Water Quality Science Beijing University of Technology Beijing 100022 China Biotech Institute Hangzhou Huadong Medicine Group Co. Ltd Hangzhou 310011 China

The characteristics of anaerobic phosphorus release and anoxic phosphorus uptake were investigated in sequencing batch reactors using denitrifying phosphorus removing bacteria （DPB） sludge. The lab-scale experiments were accomplished under conditions of various nitrite concentrations （5.5, 9.5, and 15 mg/L） and mixed liquor suspended solids （MLSS）（1844, 3231, and 6730 mg/L）. The results obtained confirmed that nitrite, MLSS, and pH were key factors, which had a significant impact on anaerobic phosphorus release and anoxic phosphorus uptake in the biological phosphorous removal process. The nitrites were able to successfully act as electron acceptors for phosphorous uptake at a limited concentration between 5.5 and 9.5 mg/L. The denitrification and dephosphorous were inhibited when the nitrite concentration reached 15 mg/L. This observation indicated that the nitrite would not inhibit phosphorus uptake before it exceeded a threshold concentration. It was assumed that an increase of MLSS concentration from 1844 mg/L to 6730 mg/L led to the increase of denitrification and anoxic P-uptake rate. On the contrary, the average P-uptake/N denitrifying reduced from 2.10 to 1.57 mg PO4^3--P/mg NO3^--N. Therefore, it could be concluded that increasing MLSS of the DEPHANOX system might shorten the reaction time of phosphorus release and anoxic phosphorus uptake. However, excessive MLSS might reduce the specific denitrifying rate. Meanwhile, a rapid pH increase occurred at the beginning of the anoxic conditions as a result of denitrification and anoxic phosphate uptake. Anaerobic P release rate increased with an increase in pH. Moreover, when pH exceeded a relatively high value of 8.0, the dissolved P concentration decreased in the liquid phase, because of chemical precipitation. This observation suggested that pH should be strictly controlled below 8.0 to avoid chemical precipitation if the biological denitrifying phosphorus removal capability is to be studied accurately.

关键词： biological phosphorus removal nitrite MLSS pH denitrifying phosphorus removing bacteria (DPB) anaerobic-anoxic processes

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

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Journal of Environmental Sciences 2007年第9期19卷 1043-1048页

作者： ZHU Gui-bing peng yong-zhen WU Shu-yun WANG Shu-ying XU Shi-wei School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Belting 100085 China. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology Beijing 100022 China Beijing Drainage Group Co. Ltd. Beijing 100038 China

The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under different influent substrate concentrations and aeration flow rates. Biological occurrence of simultaneous nitrification and denitrification was verified in the aspect of nitrogen mass balance and alkalinity. The experimental results also showed that there was a distinct linear relationship between simultaneous nitrification and denitrification and DO concentration under the conditions of low and high aeration flow rate. In each experimental run the floc sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.

关键词： biological nitrogen removal dissolved oxygen floc size simultaneous nitrification and denitrification step feeding process

Achieving and maintaining biological nitrogen removal via nitrite under normal conditions

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Journal of Environmental Sciences 2005年第5期17卷 794-797页

作者： CUI You-wei peng yong-zhen GAN Xiang-qing YE Liu WANG Ya-yi College of Environmental and Energy Engineering Beijing University of Technology Beijing 100022 China Department of Chemistry Fuling Normal University Chongqing 408003 China School of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310014 China

The principal aim of this paper is to develop an approach to realize stable biological nitrogen removal via nitrite under normal conditions. Validation of the new method was established on laboratory-scale experiments applying the sequencing batch reactor（SBR） activated sludge process to domestic wastewater with low C/N ratio. The addition of sodium chloride（NaCI） to influent was established to achieve nitrite build-up. The high nitrite accumulation, depending on the salinity in influent and the application duration of salt, was obtained in SBRs treating saline wastewater. The maintenance results indicated that the real-time SBRs can maintain stable nitrite accumulation, but conversion from shorter nitrification-denitrification to full nitrification-denitrification was observed after some operation cycles in the other SBR with fixed-time control. The presented method is valuable to offer a solution to realize and to maintain nitrogen removal via nitrite under normal conditions.

关键词： nitrite accumulation salt selective inhibition real-time control of nitrification biological nitrogen removal via nitrite nitrite-oxidizers ammonium-oxidizers

Organic matter and concentrated nitrogen removal by shortcut nitrification and denitrification from mature municipal landfill leachate

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Journal of Environmental Sciences 2007年第6期19卷 647-651页

作者： ZHANG Shu-jun peng yong-zhen WANG Shu-ying zhenG Shu-wen GUO Jin College of Environmental and Energy Engineering Beijing University of Technology Beijing 100022 China

An UASB＋Anoxic/Oxic （A/O） system was introduced to treat a mature landfill leachate with low carbon-to-nitrogen ratio and high ammonia concentration. To make the best use of the biodegradable COD in the leaehate, the denitrifieation of NOx^--N in the reeireulation effluent from the elarifier was carried out in the UASB. The results showed that most biodegradable organic matters were removed by the denitrifieation in the UASB. The NH4^＋-N loading rate （ALR） of A/O reactor and operational temperature was 0.28- 0.60 kg NH4^＋-N/（m^3-d） and 17-29℃ during experimental period, respectively. The short-cut nitrification with nitrite accumulation efficiency of 90%-99% was stabilized during the whole experiment. The NH4^＋-N removal efficiency varied between 90% and 100%. When ALR was less than 0.45 kg NH4^＋-N/（m^3.d）, the NH4^＋-N removal efficiency was more than 98%. With the influent NH4^＋-N of 1200-1800 mg/L, the effluent NH4^＋-N was less than 15 mg/L. The shortcut nitrification and denitrifieation can save 40% carbon source, with a highly efficient denitrifieation taking place in the UASB. When the ratio of the feed COD to feed NH4^＋-N was only 2-3, the total inorganic nitrogen （TIN） removal efficiency attained 67%-80%. Besides, the sludge samples from A/O reactor were analyzed using FISH. The FISH analysis revealed that ammonia oxidation bacteria （AOB） accounted for 4% of the total eubaeterial population, whereas nitrite oxidation bacteria （NOB） accounted only for 0.2% of the total eubaeterial population.

关键词： mature landfill leachate UASB+A/O shortcut nitrification carbon source

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A/O生物脱氮工艺的反硝化动力学试验

中国环境科学 2006年第4期26卷 464-468页

作者：马勇彭永臻北京工业大学北京市水质科学与水环境恢复工程重点实验室北京100022

通过SBR反应器间歇试验,研究了投加外碳源后系统的反硝化潜力和反硝化速率的变化.结果表明,向原有淀粉废水中投加外碳源乙醇废液后,可以明显提高系统的反硝化速率和反硝化潜力,反硝化速率由0.74mg/(g?h)增加到2.11mg/(g?h),反硝化潜力由... 详细信息

通过SBR反应器间歇试验,研究了投加外碳源后系统的反硝化潜力和反硝化速率的变化.结果表明,向原有淀粉废水中投加外碳源乙醇废液后,可以明显提高系统的反硝化速率和反硝化潜力,反硝化速率由0.74mg/(g?h)增加到2.11mg/(g?h),反硝化潜力由5.6mg/L增加到16.2mg/L.脉冲投加淀粉废水进行缺氧反硝化间歇试验,可以获得系统污泥动力学信息,确定原水的反硝化潜力,并可估计城市污水处理厂的总反硝化潜力,因此可以预测获得最小出水硝酸氮浓度的控制策略.相对于COD/N,如果确定了系统反硝化潜力和污水水质能获得更多信息.

关键词：反硝化潜力 COD/N 反硝化速率反硝化动力学污水特性

Effects of low temperature on sludge settleability and nutrients removal performance treating domestic wastewater

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Journal of Harbin Institute of Technology(New Series) 2011年第5期18卷 55-60页

作者：彭赵旭彭永臻刘旭亮于振波柴同志 State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology College of Environment and Energy Engineering Beijing Institute of Technology

In order to investigate the effect of temperature on activated sludge systems,sludge settleability,nitrogen and phosphorus removal processes were investigated by changing temperature variation patterns using 4 sequencing batch reactors (SBR).The results showed that no matter temperature changes in the range of 15-22 ℃ (decrease or increase) gradually or sharply,it has little effect on nitrogen and phosphorus removal *** when temperature decreases to 12 ℃,biochemical reactions will be inhibitted *** least 1 sludge retention time (SRT) is needed for nitrification adapt to new temperature envirionment,and more time is necessary for phosphorus removal *** temperature increases from 12 ℃ to 22 ℃ sharply,nitrification process deteriorates seriously,but phosphorus removal process shows no *** addition,sludge settleability deteriorates when temperature changes sharply (decrease or increase),but the reasons are *** temperature decrease condition,it is mainly caused by the increase of accumulated extracellular polymeric substances (EPS).Under temperature increase condition,the loosing sludge flocs' configuration is the main *** should be pointed out that the filamentous bacteria content during the entire experiment keeps almost constant,and the sludge settleability variations are the reflection of the change of sludge physicochemical characteristics.

关键词： low temperature activated sludge SBR nitrogen and phosphorus removal sludge settleability

pH值对SBR生物反应器出水溶解态有机质含量与构成的影响

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环境科学 2008年第6期29卷 1538-1543页

作者：郭瑾彭永臻北京工业大学环境与能源工程学院水污染控制室北京100022

为探讨污水二级生化出水中有机物(EfOM)的构成特点和变化规律,采用配置生活污水,对不同pH值运行条件下,SBR生物反应器出水中的溶解态有机质(DOM)含量和构成进行了比较研究.结果表明,运行期间pH值的调节对SBR反应器出水DOM含量与构成的... 详细信息

为探讨污水二级生化出水中有机物(EfOM)的构成特点和变化规律,采用配置生活污水,对不同pH值运行条件下,SBR生物反应器出水中的溶解态有机质(DOM)含量和构成进行了比较研究.结果表明,运行期间pH值的调节对SBR反应器出水DOM含量与构成的影响均较大.初始pH为6.5的SBR反应器,pH值降低为6.0后,出水DOC由原来的4.0 mg.L-1不断升高,进一步提高pH值,能够起到一定的缓解作用;初始pH为8.0的SBR反应器,出水DOC从4.0 mg.L-1快速降低并保持在2mg.L-1左右,pH值降低为6.5后,DOC变化不大.单宁酸和蛋白质、碳水化合物、DNA等微生物代谢产物(SMPs)是出水DOM的主要组成部分,pH值对SMPs生成的影响是一个长期的过程,运行过程中降低pH值,造成出水SMPs含量不断升高.pH值对整个循环过程中溶解态有机物降解情况的影响,在厌氧阶段发挥了主要作用,较高pH值有利于厌氧阶段有机物的降解,而好氧阶段的有机物降解受pH值影响不大.

关键词：污水二级生化出水二级生化出水有机物 pH值微生物代谢产物蛋白质碳水化合物单宁酸 DNA