Enhanced nitrogen removal from low strength anaerobic membrane bioreactor(AnMBR)permeate using complete nitrification and partial denitrification-anammox processes

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外文摘要：In this study,an anaerobic membrane bioreactor coupled with a complete nitrification and partial denitrification-anammox process(AnMBR-NF-PDA)was developed to efficiently remove both chemical oxygen demand(COD)and nitrogen.Precise control of raw water ratios was utilized to adjust the ratio of COD/NO3--N,resulting in maximum nitrogen removal efficiency of 90.14％at a ratio of 3.44.Initially,specific anammox activity(SAA)increased with the proportion of raw water,peaking at 17.83 mg-N/(g-VSS·d)in stage Ⅱ before decreasing.This variation was attributed to the significant presence of filamentous bacteria,especially"Acinetobacter"(13.58％-31.59％),which facilitated nitrite generation,supporting the nitrous oxide hypothesis in partial denitrification processes and enabling cross-feeding with AnAOB.Additionally,the average particle size of granular sludge increased from 300 to 528 pm under the influence of filamentous bacteria.Metagenomic analysis revealed an upsurge in genes associated with partial denitrification(NarG and NapA)as the COD/NO3-N ratio rose.The abundance of genes closely correlated with anammox(Hzs and Hdh)peaked during stage Ⅱ,indicating the beneficial role of filamentous bacteria in the stable conversion of nitrite in PDA system.This study offers valuable insights into optimizing the synergistic metabolism and granulation processes involving filamentous bacteria and AnAOB,thereby laying the groundwork for the practical application of AnMBR coupled with anammox processes in wastewater treatment.

外文关键词：

AnammoxAnaerobic membrane bioreactorCod/No3--NFilamentous bacteria

作者：

Jingwei Fu、Zhaoyang Hou、Hexiang Zhao、Qian Li、Rong Chen、Yu-You Li

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作者单位：

Key Laboratory of Environmental Engineering,Shaanxi Province,Xi'an University of Architecture and Technology,Xi'an 710055,China

Hualu Engineering & Technology Co.,Ltd.,Xi'an 710000,China

International Science & Technology Cooperation Center for Urban Alternative Water Resources Development,Key Laboratory of Northwest Water Resource,Environment and Ecology,MOE,Xi'an University of Architecture and Technology,Xi'an 710055,China

Department of Civil and Environmental Engineering,Graduate School of Engineering,Tohoku University,Sendai Miyagi 980-8579,Japan

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出版年：

2024

DOI：

10.1007/s11783-024-1915-1

环境科学与工程前沿

高等教育出版社

环境科学与工程前沿

影响因子：0.545

ISSN：2095-2201

年,卷(期)：2024.18(12)