首页|Revealing the intrinsic mechanisms for accelerating nitrogen removal efficiency in the Anammox reactor by adding Fe(Ⅱ)at low temperature

Revealing the intrinsic mechanisms for accelerating nitrogen removal efficiency in the Anammox reactor by adding Fe(Ⅱ)at low temperature

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Fe(Ⅱ)is an essential trace element for anaerobic ammonium oxidation bacteria(AAOB)metabolism,and can improve the nitrogen removal efficiency of anaerobic ammonia oxidation(Anammox).Here we oper-ated two identical expanded granular sludge bed(EGSB)reactors at low temperature(15±3 ℃)for 154 days.Reactor 1(R1)received additional Fe(Ⅱ)(0.12mmol/L)during the late startup phase,while reactor 0(R0)served as the control and did not receive extra Fe(Il).Nitrogen removal in R1 became stable at 55 d of operation,ten days earlier than R0.The nitrogen removal rate(NRR)of R1 was 1.64kg N m-3 d-1 and its TN removal rate was as high as 89％,while R0 only reached 75％.The addition of Fe(Ⅱ)was fur-ther beneficial to aggregation and stability of the granular sludge,and the used sludge of both reactors showed enrichment for AAOB populations compared to the inoculum,for instance,increased abundance of Candidatus-Kuenenia and in particular of Candidatus-Brocadia(from 0.17％to 10.10％in R0 and 7.79％in R1).Diverse microbial species and complex microbial network structure in R1 compared to R0 promoted the coupled denitrogenation by Anammox,dissimilatory nitrate reduction to ammonium(DNRA),nitrate-dependent Fe oxidation(NDFO),and ferric ammonium oxidation(Feammox).In addition,the microbial community in R1 was more resistant to short-term low temperature(2-7 ℃)starvation,illustrating a further positive effect of adding Fe(Ⅱ)during the startup phase of an Anammox reactor.

Ambient low temperatureAnammoxFe(Ⅱ)Extracellular polymeric substancesMicrobial communityMicrobial network analysis

Linjing Li、Wenlai Xu、Jianyong Ning、Yaping Zhong、Chuyue Zhang、Jiane Zuo、Zhicheng Pan

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State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection,Chengdu University of Technology,Chengdu 610059,China

National Postdoctoral Research Station,Haitian Water Group,Chengdu 610213,China

Laboratory of Municipal Wastewater Treatment Technology in Sichuan Province,Chengdu 610213,China

National Enterprise Technology Center,Haitian Water Group,Chengdu 610213,China

Water Safety and Water Pollution Control Engineering Technology Research Center in Sichuan Province,Chengdu 610213,China

State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China

Institute of Environment and Ecology,Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China

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2024

10.1016/j.cclet.2023.109243

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(8)