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Optimization of phosphorus removal in uniFed SBR system for domestic wastewater treatment

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Frontiers of Environmental Science & Engineering 2010年第4期4卷 475-481页

作者： Xuguang TANG Shuying WANG yongzhen peng Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing University of TechnologyBeijing 100124China

The characteristic of phosphorus removal andappropriate change of the traditional operation modes wereinvestigated in UniFed sequencing batch reactor (SBR)laboratory-scale apparatus (40 L), treating actual domesticwastewater with low ratios of C/N (2.57) and C/P (30.18),providing theoretical basis for actual application ofwastewater treatment plant. UniFed SBR system with itsunique operation mode had the distinct superiority ofphosphorus removal. On this occasion, the effect ofvolumetric exchange ratio (VER) and the method ofinfluent introduction for phosphorus removal were *** the carbon source became the limiting factor tophosphorus release, the higher the VER, the lower thephosphorus concentration in the effluent. Three differentinfluent patterns, including one-time filling, four-timefilling, and continuous filling with the same quantity ofwastewater could increase the release rate of anaerobicphosphorus from 0.082 to 0.143 mg·P·(L·min)-1. Appropriatechange of the traditional operation modes couldoptimize the efficiency of phosphorus removal. When thefeed/ decant time was extended from 2 h to 4 h, thephosphorous removal efficiency increased from 59.93% to88.45% without any external carbon source. In the mode ofalternation of anoxic-aerobic (A/O) condition, phosphorousremoval efficiency increased from 55.07% to 72.27%clearly. The carbon source in the influent can be usedadequately, and denitrifying phosphorus removal wascarried out in anoxic stage 2 (A2). This mode was optimalfor the treatment of actual domestic wastewater with lowC/N and C/P ratios.

关键词： UniFed sequencing batch reactor(SBR) phosphorus removal volumetric exchange ratio(VER) alternation of anoxic-aerobic(A/O) domestic wastewater

Achieving partial nitrification by inhibiting the activity of Nitrospira-like bacteria under high-DO conditions in an intermittent aeration reactor

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Journal of Environmental Sciences 2017年第6期29卷 71-78页

作者： peng Bao Shuying Wang Bin Ma Qiong Zhang yongzhen peng Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Engineering Research Center of BeijingBeijing University of TechnologyBeijing 10024China

It is generally accepted that a low dissolved oxygen （DO） concentration is more beneficial for achieving partial nitrification than high-DO. In this study, partial nitrification was not established under low-DO conditions in an intermittent aeration reactor for treating domestic wastewater. During the operational period of low-DO conditions （DO： 0.3 ± 0.14 rag/L）, stable complete nitrification was observed. The abundance of Nitrospira-like bacteria, which were the major nitrite-oxidizing bacteria, increased from 1.03 x 10^6 to 2.64 x 10^5 cells/mL. At the end of the low-DO period, the batch tests showed that high-DO concentration （1.5, 2.0mg/L） could inhibit nitrite oxidation, and enhance ammonia oxidation. After switching to the high-DO period （1.8 ± 0.32 mg/L）, partial nitrification was gradually achieved. Nitrospira decreased from 2.64 x 10^6 to 8.85 x 10^5 cells/mL. It was found that suddenly switching to a high-DO condition could inhibit the activity and abundance of Nitrospira-like bacteria, resulting in partial nitrification.

关键词： Partial nitrificationDissolved oxygenNitrospira Bioreactors

Advanced nitrogen and phosphorus removal in A^(2)O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 474-480页

作者： Jianhua WANG yongzhen peng Yongzhi CHEN Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

A laboratory-scale anaerobic-anoxic-aerobic process(A^(2)O)with a small aerobic zone and a bigger anoxic zone and biologic aerated filter(A^(2)O-BAF)system was operated to treat low carbon-to-nitrogen ratio domestic *** A^(2)O process was employed mainly for organic matter and phosphorus removal,and for *** BAF was only used for nitrification which coupled with a settling tank Compared with a conventional A^(2)O process,the suspended activated sludge in this A^(2)OBAF process contained small quantities of nitrifier,but nitrification overwhelmingly conducted in *** the system successfully avoided the contradiction in sludge retention time(SRT)between nitrifying bacteria and phosphorus accumulating organisms(PAOs).Denitrifying phosphorus accumulating organisms(DPAOs)played an important role in removing up to 91%of phosphorus along with nitrogen,which indicated that the suspended activated sludge process presented a good denitrifying phosphorus removal *** average removal efficiency of chemical oxygen demand(COD),total nitrogen(TN),total phosphorus(TP),and NH_(4)^(+)-N were 85.56%,92.07%,81.24%and 98.7%*** effluent quality consistently satisfied the national first level A effluent discharge standard of *** average sludge volume index(SVI)was 85.4 mL·g^(-1)additionally,the volume ratio of anaerobic,anoxic and aerobic zone in A^(2)O process was also investigated,and the results demonstrated that the optimum value was 1:6:2.

关键词： Anoxic zone and biologic aerated filter(A^(2)OBAF)system domestic wastewater with low carbon-tonitrogen ratio advanced nitrogen and phosphorus removal denitrifying phosphorus removal

Achieving nitritation at low temperatures using free ammonia inhibition on Nitrobacter and real-time control in an SBR treating landfill leachate

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Journal of Environmental Sciences 2015年第4期27卷 157-163页

作者： Hongwei Sun yongzhen peng Shuying Wang Juan Ma Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology School of Environmental and Municipal Engineering Lanzhou Jiaotong University

Free ammonia（FA） inhibition on nitrite-oxidized bacteria（NOB） and real-time control are used to achieve nitrogen removal from landfill leachate via nitrite pathway at low temperatures in sequencing batch reactor. The inhibition of FA on NOB activity during the aerobic period was prolonged using real-time control. The degree of nitrite accumulation was monitored along with variations of the ammonia-oxidizing bacteria and NOB population using fluorescence in situ hybridization techniques. It is demonstrated that the end-point of ammonia oxidization is detected from the on-line measured dissolved oxygen,oxidization–reduction potential, and p H signals, which could avoid the loss the FA inhibition on NOB caused by excess aeration. At low temperature（13.0–17.6°C）, the level of nitrite pathway rapidly increased from 19.8% to 90%, suggesting that nitritation was successfully started up at low temperature by applying syntrophic association of the FA inhibition and real-time control, and then this high level of nitrite pathway was stably maintained for as long as 233 days. Mechanism analysis shows that the establishment of nitritation was primarily the result of predominant ammonia-oxidizing bacteria developed in the nitrifying bacteria population compared to NOB. This was mainly due to a gradual reduction of nitrite amount that is available to provide energy for the growth of NOB,eventually leading to the elimination of NOB from the bacterial clusters in sequencing batch reactor sludge system.

关键词： Landfill leachate Nitritation Low temperature Free ammonia Inhibition AOB and NOB

Start-up of PN-anammox system under low inoculation quantity and its restoration after low-loading rate shock

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Frontiers of Environmental Science & Engineering 2021年第2期15卷 169-179页

作者： Guoliang Zhang Liang Zhang Xiaoyu Han Shujun Zhang yongzhen peng National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Engineering Research Center of BeijingBeijing University of TechnologyBeijing 100124China Research and Development Center of Beijing Drainage Group Technology Beijing 100124China

Partial nitritation(PN)-anaerobic ammonium oxidation(anammox)is a promising pathway for the biological treatment of ***,the destruction of the system caused by excessive accumulation of nitrate in long-term operation remains a *** this study,PNanammox was initialized with low inoculation quantity in an air-lift *** nitrogen removal rate of 0.71 kgN/(m^(3)·d)was obtained,which was far higher than the seed sludge(0.3 kgN/(m^(3)·d)).Thereafter,excess nitrate build-up was observed under low-loading conditions,and recovery strategies for the PN-anammox system were *** results suggest that increasing the nitrogen loading rate as well as the concentration of free ammonium failed to effectively suppress the nitrite oxidation bacteria(NOB)after the PN-anammox system was ***,effluent back-flow was added into the reactor to control the up-flow *** a result,an aggressive discharge of sludge that promoted the synergetic growth of functional bacteria was achieved,leading to the successful restoration of the PN-anammox *** partial nitritation and anammox activity were in balance,and an increase in nitrogen removal rate up to 1.07 kgN/(m^(3)·d)was obtained with a nitrogen removal efficiency of 82.4%after ***,the proportion of granular sludge(over 200 mm)increased from 33.67%to 82.82%.Ammonium oxidation bacteria(AOB)along with anammox bacteria were enriched in the granular sludge during the recovery period,which was crucial for the recovery and stable operation of the PN-anammox system.

关键词： PN-anammox Granular sludge Excess nitrate build-up Recovery strategy for partial nitrification Aggressive discharge of sludge

Sludge fermentation liquid addition attained advanced nitrogen removal in low C/N ratio municipal wastewater through short-cut nitrification-denitrification and partial anammox

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Frontiers of Environmental Science & Engineering 2021年第2期15卷 107-116页

作者： Shengjie Qiu Jinjin Liu Liang Zhang Qiong Zhang yongzhen peng National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Engineering Research Center of BeijingBeijing University of TechnologyBeijing 100124China

Biological nitrogen removal of wastewater with low COD/N ratio could be enhanced by the addition of wasted sludge fermentation liquid(SFL),but the performance is usually limited by the introducing *** this study,the process of using SFL was successfully improved by involving anammox *** municipal wastewater with a low C/N ratio of 2.8–3.4 was treated in a sequencing batch reactor(SBR).The SBR was operated under anaerobic-aerobic-anoxic(AOA)mode and excess SFL was added into the anoxic *** short-cut nitrification was achieved after 46d and then anammox sludge was *** the stable period,effluent total inorganic nitrogen(TIN)was less than 4.3 mg/L with removal efficiency of 92.3%.Further analysis suggests that anammox bacteria,mainly affiliated with Candidatus_Kuenenia,successfully reduced the external ammonia from the SFL and contributed approximately 28%–43%to TIN ***,this study suggests anammox could be combined with SFL addition,resulting in a stable enhanced nitrogen biological removal.

关键词： Sludge fermentation liquid Municipal wastewater Advanced nitrogen removal Short-cut nitrification Partial anammox

Effect of wastewater COD/N ratio on aerobic nitrifying sludge granulation and microbial population shift

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Journal of Environmental Sciences 2012年第2期24卷 234-241页

作者： Lei Wu Chengyao peng yongzhen peng Lingyun Li Shuying Wang Yong Ma Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology Beijing 100124 China

The effect of COD/N ratio on the granulation process and microbial population succession was *** 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 *** granules were successfully cultivated in R2 and R3,operating with the COD/N ratio of 200/200 and 400/200,*** 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 *** average specific nitritation rate in R2 and R3 were 0.019 and 0.008 mg N/（mg ***）,*** in situ hybridization results demonstrated that nitrifying bacteria population was enriched remarkably in *** indicated that nitrification ability and nitrifying bacteria population were enriched remarkably at low COD/N ***,no granules were formed in R1 and R4 which might attribute to either limited or excessive extracellular polymeric substances *** study contributed to a better understanding of the role of COD/N ratio in nitrifying sludge granulation.

关键词： aerobic granules COD/N ratio sequencing batch reactor nitrification performance microbial population shift

New perspectives in free nitrous acid (FNA) uses for sustainable wastewater management

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 161-168页

作者： Zhiqiang Zuo Min Zheng Tao Liu yongzhen peng Zhiguo Yuan National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Engineering Research Center of BeijingBeijing University of TechnologyBeijing 100124China Australian Centre for Water and Environmental Biotechnology The University of QueenslandSt.LuciaQLD 4072Australia Water Research Centre School of Civil and Environmental EngineeringUniversity of New South WalesSydneyNew South Wales 2052Australia Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China School of Energy and Environment City University of Hong KongHong Kong 999077China

The biocidal effects of free nitrous acid (FNA) have found applications in multiple units in an urban wastewater system, including sewer networks, wastewater treatment processes, and sludge treatment processes. However, these applications are associated with chemical costs as both nitrite and acid are needed to produce FNA at the required levels. The recent discovery of novel acid-tolerant ammonia oxidizers offers the possibility to produce FNA from domestic wastewater, enabling the development of next-generation FNA-based technologies capable of achieving self-sustaining FNA production. In this study, we focus on the concept of in situ FNA generation facilitated by acid-tolerant ammonia oxidizers and highlight the multiple benefits it creates, after a brief review of the historical development of FNA-based technologies. We will discuss how wastewater systems can be made more energy-efficient and sustainable by leveraging the potential of acid-tolerant ammonia oxidizers.

关键词： Free nitrous acid Acid-toler antammonia oxidizer In situ generationl Wastewater management

Simultaneous removal of hydrogen sulfide and volatile organic sulfur compounds in off-gas mixture from a wastewater treatment plant using a two-stage bio-trickling filter system

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 153-165页

作者： Shihao Sun Tipei Jia Kaiqi Chen yongzhen peng Liang Zhang National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology and Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Beijing University of TechnologyBeijing 100124China

Simultaneous removal of hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) in off-gas mixture from a wastewater treatment plant (WWTP) is difficult due to the occasional inhibitory effects of H2S on VOSC degradation. In this study, a two-stage bio-trickling filter (BTF) system was developed to treat off-gas mixture from a real WWTP facility. At an empty bed retention time of 40 s, removal efficiencies of H2S, methanethiol, dimethyl sulfide, and dimethyl disulfide were 90.1, 88.4, 85.8 and 61.8%, respectively. Furthermore, the effect of lifting load shock on system performance was investigated and results indicated that removal of both H2S and VOSCs was slightly affected. Illumina Miseq sequencing revealed that the microbial community of first-stage BTF contained high abundance of H2S-affinity genera including Acidithiobacillus (51.43%), Metallibacterium (25.35%), and Thionomas (8.08%). Analysis of mechanism demonstrated that first stage of BTF removed 86.1% of H2S, mitigating the suppression on VOSC degradation in second stage of BTF. Overall, the twostage BTF system, an innovative bioprocess, can simultaneously remove H2S and VOSC.

关键词： Odor Two-stage bio-trickling filter process Bio-trickling filter Hydrogen sulfide Volatile organic sulfur compound