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Occurrence and Roles of Comammox Bacteria in Water and Wastewater Treatment Systems:A Critical Review

Engineering 2022年第10期17卷 196-206页

作者： Naga Raju Maddela Zhihao Gan Yabing meng Fuqiang Fan fangang meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China Departamento de Ciencias Biológicas Facultad de Ciencias de la SaludUniversidad Técnica de ManabíPortoviejo 130105Ecuador Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510006China

Nitrogen removal is a critical process in water treatment plants(WIPs)and wastewater treatment plants(WWTPs).The recent discovery of a novel bacterial process,complete ammonia oxidation(comammox,CMX),has refuted a century-long perception of the two-step conversion of NH3to NO3-.Compared with canonical nitrifiers,CMX bacteria offer undeniable advantages,such as a high growth yield propensity and adaptability to nutrient-and growth-limiting conditions,which collectively draw attention to validate the aptness of CMX bacteria to wastewater treatment.As there has been no comprehensive review on the relevance of CMX bacteria for sustainable water and wastewater treatment,this review is intended to discuss the roles and applications of CMX in the removal of nitrogen and pollutants from water and wastewater.We took into account insights into the metabolic versatilities of CMX bacteria at the clade and subclade levels.We focused on the distribution of CMX bacteria in engineered systems,niche differentiation,co-occurrence and interactions with cano nical nitrifiers for a better understanding of CMX bacteria in terms of their ecophysiology.Conceptualized details on the reactor adaptability and stress response of CMX bacteria are provided.The potential of CMX bacteria to degrade micropollutants either directly or co-metabolically was evaluated,and these insights would be an indispensable advantage in opening the doors for wider applications of CMX bacteria in WWTPs.Finally,we summarized future directions of research that are imperative in improving the understanding of CMX biology.

关键词： Comammox bacteria Wastewater treatment Nitrogen removal Micropollutant degradation Reactor operation

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Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale anaerobic/anoxic/aerobic municipal sewage treatment plant

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 107-120页

作者： Hongcan Cui Ronghua Xu Zhong Yu Yuanyuan Yao Shaoqing Zhang fangang meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China

Understanding the structures and dynamics of bacterial communities in activated sludge(AS)in full-scale wastewater treatment plants(WWTPs)is of both engineering and ecological significance.Previous investigations have mainly focused on the AS communities of WWTP aeration tanks,and the differences and interactions between the communities in anaerobic and anoxic tanks of the AS system remain poorly understood.Here,we investigated the structures of bacterial communities and their inter-connections in three tanks(anaerobic,anoxic,and aerobic)and influent from a full-scale WWTP with conventional anaerobic/anoxic/aerobic(A/A/O)process over a year to explore their functionality and network differentiation.High-throughput sequencing showed that community compositions did not differ appreciably between the different tanks,likely due to the continuous sludge community interchange between tanks.However,network analysis showed significant differences in inter-species relationships,OTU topological roles,and keystone populations in the different AS communities.Moreover,the anoxic network is expected to be more unstable and easily affected by environmental disturbance.Tank-associated environmental factors,including dissolved oxygen,pH,and nutrients,were found to affect the relative abundance of functional genera(i.e.,AOB,NOB,PAOs,and denitrifiers),suggesting that these groups were more susceptible to environmental variables than other bacteria.Therefore,this work could assist in improving our understanding of tank-associated microbial ecology,particularly the response of functional bacteria to seasonal variations in WWTPs employing A/A/O process.

关键词： Activated sludge Bacterial community Tank-dependence Network association Functional bacteria

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Core activated sludge communities are influenced little by immigration:Case study of a membrane bioreactor plant

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Journal of Environmental Sciences 2021年第4期33卷 244-255页

作者： Shaoqing Zhang fangang meng School of Civil Engineering Guangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China

Microbial immigrants arriving with influent wastewater may influence activated sludge(AS)ecosystems.However,the extent to which immigration impacts AS communities is still debated.To explore the intensity of immigration impact,we used sequencing technology to track the raw wastewater and AS communities from a membrane bioreactor plant over a 12-month period.We first distinguished core populations from peripheral ones in both raw wastewater and AS based on their occurrence frequency and abundance.The results showed that core OTUs(≥80%occurrence frequency)made up a large fraction(>90%)of total sequences,while peripheral OTUs composed the majority of all detected OTUs but merely occupied a few sequences.A significant difference in core communities between the influent and AS was found,as well as between the compositions of core and peripheral populations.Additionally,the persistent functional bacteria of AS,although not numerically dominant,accounted for 96.24%of the total sequences related to nutrient turnover,suggesting the presence of a small number of longstanding and core functional bacteria in the AS ecosystem.Importantly,64%of the 5188 OTUs in AS,which accounted for 91.51%of the sequences,exhibited positive growth rates,which suggested that their apparent abundances were due to growth within the plant,not from immigration.Taken together,these results demonstrated that the impact of influent populations on core AS communities was limited.Overall,this work provides quantitative insights into the impact of immigration,which is expected to advance our understanding of the AS community assembly.

关键词： Membrane bioreactor Activated sludge Core community Active population Immigration impact

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Selective elimination of chromophoric and fluorescent dissolved organic matter in a full-scale municipal wastewater treatment plant

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Journal of Environmental Sciences 2017年第7期29卷 150-161页

作者： Xiaofang Yang Zhongbo Zhou Maddela Naga Raju Xiaoxuan Cai fangang meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275China Lijiao Wastewater Treatment Plant Cuangzhou 510275China

Effluent organic matter（Ef OM） from municipal wastewater treatment plants potentially has a detrimental effect on both aquatic organisms and humans.This study evaluated the removal and transformation of chromophoric dissolved organic matter（CDOM） and fluorescent dissolved organic matter（FDOM） in a full-scale wastewater treatment plant under different seasons.The results showed that bio-treatment was found to be more efficient in removing bulk DOM（in term of dissolved organic carbon,DOC） than CDOM and FDOM,which was contrary to the disinfection process.CDOM and FDOM were selectively removed at various stages during the treatment.Typically,the low molecular weight fractions of CDOM and protein-like FDOM were more efficiently removed during bio-treatment process,whereas the humic-like FDOM exhibited comparable decreases in both bio-treatment and disinfection processes.Overall,the performance of the WWTP was weak in terms of CDOM and FDOM removal,resulting in enrichment of CDOM and FDOM in effluent.Moreover,the total removal of the bulk DOM（P 〈 0.05） and the protein-like FDOM（P 〈 0.05） displayed a significant seasonal variation,with higher removal efficiencies in summer,whereas removal of CDOM and the humic-like FDOM showed little differences between summer and winter.In all,the results provide useful information for understanding the fate and transformation of DOM,illustrating that sub-fractions of DOM could be selectively removed depending on treatment processes and seasonality.

关键词： Municipal wastewater Dissolved organic matter EEM spectroscopy UV–vis absorbance Process dependency

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Genome-resolved metagenomic analysis reveals different functional potentials of multiple Candidatus Brocadia species in a full-scale swine wastewater treatment system

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 13-25页

作者： Yabing meng Depeng Wang Zhong Yu Qingyun Yan Zhili He fangang meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production Changsha 410125China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

The increasing application of anammox processes suggests their enormous potential for nitrogen removal in wastewater treatment facilities.However,the functional potentials and ecological differentiation of cooccurring anammox species in complex ecosystems have not been well elucidated.Herein,by utilizing functional reconstruction and comparative genome analysis,we deciphered the cooccurring mechanisms of four Candidatus Brocadia species that were spontaneously enriched in a full-scale swine wastewater treatment system.Phylogenetic analysis indicated that species SW172 and SW745 were closely related to Ca.Brocadia caroliniensis and Ca.Brocadia sapporoensis,respectively,whereas the dominant species SW510 and SW773,with a total average abundance of 34.1%,were classified as novel species of the genus Ca.Brocadia.Functional reconstruction revealed that the novel species SW510 can encode both cytochrome cd1-type nitrite reductase and hydroxylamine oxidase for nitrite reduction.In contrast,the detected respiratory pentaheme cytochrome c nitrite reductase and acetate kinase genes suggested that SW773 likely reduced nitrite to ammonium with acetate as a carbon source.Intriguingly,the presence of genes encoding urease and cyanase indicated that both novel species can use diverse organic nitrogen compounds in addition to ammonia and nitrite as substrates.Taken together,the recovery and comparative analysis of these anammox genomes expand our understanding of the functional differentiation and cooccurrence of the genus Ca.Brocadia in wastewater treatment systems.

关键词： Anammox Candidatus Brocadia Functional potential Cooccurring mechanisms Swine wastewater treatment facilities

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Comprehensive comparison of delta-and wye-connected autotransformer applied to 12-pulse rectifier

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Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 135-145页

作者： fangang meng Lei GAO Wei YANG Shiyan YANG Department of Electrical Engineering and Automation Harbin Institute of TechnologyHarbinChina

12-pulse rectifier is extensively used in high power rectification, and the delta-connected autotransformer and wye-connected autotransformer are its two most popular phase-shift transformers. This paper compares the 12-pulse rectifiers using the two transformers via calculating the input line current, load voltage, kVA ratings of the two autotransformer, kVA ratings of the auxiliary magnetic devices. From the viewpoint of power quality of AC mains and DC side, the two 12-pulse rectifiers are the same. The kVA rating of the IPR in the two 12-pulse rectifiers are equal, and the kVA rating of the ZSBT in the two 12-pulse rectifier are also equal to each other, under the same load power. However, the kVA of the deltaconnected autotransformer is less than that of the wyeconnected autotransformer under the same load power.Some experimental results are shown to validate the correctness of the theoretical analysis.

关键词： Multi-pulse rectifier(MPR) Delta-connected autotransformer Wye-connected autotransformer kVA rating Inter-phase reactor(IPR) Zero-sequence blocking transformer(ZSBT)

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Prevention and Control of Iodine Deficiency Disorders—China,1995–2020

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China CDC weekly 2020年第20期2卷 345-349页

作者： Peng Liu Lijun Fan fangang meng Xiaohui Su Shoujun Liu Hongmei Shen Dianjun Sun Centre for Endemic Disease Control Chinese Center for Disease Control and PreventionHarbin Medical UniversityHarbinHeilongjiangChina

Basic Information about Iodine Deficiency Disorders Iodine is an essential micronutrient for the human body and an important raw material for the synthesis of thyroid hormones.Thyroid hormones maintain the basic activities of the body and have different effects on almost all systems of the body by promoting growth and development,participating in brain development,regulating metabolism,and impacting most organs and system functions.

关键词： functions maintain synthesis

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基于碳减排的厌氧氨氧化脱氮工艺应用及强化调控进展

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环境工程技术学报 2024年第2期14卷 389-397页

作者：陈子健周忠波孟凡刚广州行政学院西南大学资源环境学院中山大学环境科学与工程学院

随着我国“双碳”目标的提出和水处理行业提标改造的重点落在生物脱氮,污水处理厂从关注满足排放许可限制转向实现碳中和、能量自给及资源回收。厌氧氨氧化(Anammox)技术凭借无需外加有机碳源、占地面积小、污泥产量少以及脱氮效率高等... 详细信息

随着我国“双碳”目标的提出和水处理行业提标改造的重点落在生物脱氮,污水处理厂从关注满足排放许可限制转向实现碳中和、能量自给及资源回收。厌氧氨氧化(Anammox)技术凭借无需外加有机碳源、占地面积小、污泥产量少以及脱氮效率高等节能降耗与碳减排优势,代表着未来污水生物脱氮的发展方向。基于已有研究成果,梳理对比了传统脱氮与Anammox反应的发展历程;重点综述了新兴短程硝化耦合Anammox(PN-A)工艺、短程反硝化耦合Anammox(PD-A)工艺和甲烷型反硝化耦合Anammox(DAMO-Anammox)工艺在城市主流工况的应用进展;详细探讨了主流Anammox工艺面临低温、进水负荷不均和光照等环境因素冲击时,可施行的“侧流污泥补充至主流”“侧流污水间歇性补充至主流”“驯化生物膜颗粒”等内源性以及外源性的强化调控策略及内在机制;最后围绕分子生物学技术、材料科学、数字信息技术和管理政策,对加快Anammox生物脱氮技术的创新发展与推广应用进行了展望。

关键词：污水处理厂厌氧氨氧化(Anammox) 碳减排技术强化调控生物脱氮

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Taxonomic and functional variations in the microbial community during the upgrade process of a full-scale landfill leachate treatment plant-from conventional to partial nitrification-denitrification

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 17-28页

作者： Binbin Sheng Depeng Wang Xianrong Liu Guangxing Yang Wu Zeng Yiqing Yang fangang meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China Guangzhou Environmental Protection Investment Group Co. Guangzhou 510330China School of Life Sciences and Biopharmaceutics Guangdong Pharmaceutical UniversityGuangzhou 510006China

Because of the low access to biodegradable organic substances used for denitrification,the partial nitrification-denitrification process has been considered as a low-cost,sustainable alternative for landfill leachate treatment.In this study,the process upgrade from conventional to partial nitrificationdenitrification was comprehensively investigated in a full-scale landfill leachate treatment plant(LLTP).The partial nitrification-denitrification system was successfully achieved through the optimizing dissolved oxygen and the external carbon source,with effluent nitrogen concentrations lower than 150 mg/L.Moreover,the upgrading process facilitated the enrichment of Nitrosomonas(abundance increased from 0.4%to 3.3%),which was also evidenced by increased abundance of amoA/B/C genes carried by Nitrosomonas.Although Nitrospira(accounting for 0.1%-0.6%)was found to stably exist in the reactor tank,considerable nitrite accumulation occurred in the reactor(reaching 98.8 mg/L),indicating high-efficiency of the partial nitrification process.Moreover,the abundance of Thauera,the dominant denitrifying bacteria responsible for nitrite reduction,gradually increased from 0.60%to 5.52%during the upgrade process.This process caused great changes in the microbial community,inducing continuous succession of heterotrophic bacteria accompanied by enhanced metabolic potentials toward organic substances.The results obtained in this study advanced our understanding of the operation of a partial nitrification-denitrification system and provided a technical case for the upgrade of currently existing full-scale LLTPs.

关键词： Landfill leachate Process upgrade Partial nitrification-denitrification Bacterial community Metagenomics

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Photochemical alteration of biogenic particles in wastewater effluents

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Chinese Science Bulletin 2014年第28期59卷 3659-3668页

作者： Xiaofang Yang Zengquan Li fangang meng Zhigang Wang Li Sun SYSU-HKUST Research Center for Innovative Environmental Technology (SHRCIET) School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Department of Atmospheric Science School of Environmental Science and Engineering Sun Yat-sen University

Biogenic particles discharged by wastewater treatment plants play important roles in receiving water because of the large specific surface area and good mobility of the particles. In this study, the changes induced in biogenic particles by natural sunlight were investigated to understand the phototransformation of the particles in the receiving waters. The results showed that photoexposure resulted in significant decreases in the sizes of the biogenic particles but that photoexposure did not impact the zeta potentials. In addition, the photodissolution of biogenic particulate organic matter(POM) led to the generation of biogenic dissolved organic matter(DOM). Characterization using excitation–emission matrix(EEM) spectroscopy showed that photoexposure changed both the shapes and the intensities of the EEM spectra of the biogenic POM; the regions of the T1 and T2 peaks were susceptible to photoexposure. Modeling by parallel factor analysis(PARAFAC) decomposed the EEMs of the biogenic POM into four valid components, i.e., terrestrial or microbial humic-like substances, tryptophan-like proteins, tyrosinelike proteins and hydrophobic proteins. The humic-like substances in the biogenic POM from the effluents were subject to lower decreases(17.0 % and 11.6 %).Throughout the entire incubation time, the PARAFAC components in the biogenic DOM were dominated by elimination mechanisms rather than by production through photodissolution of the biogenic POM.

关键词：生物颗粒废水排放光化学有机物质污水处理厂聚甲醛蛋白质比表面积

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