Sustainable treatment of nitrate-containing wastewater by an autotrophic hydrogen-oxidizing bacterium  

作　　者：Yi-Zhen Chen Li-Juan Zhang Ling-Yun Ding Yao-Yu Zhang Xi-Song Wang Xue-Jiao Qiao Bao-Zhu Pan Zhi-Wu Wang Nan Xu Hu-Chun Tao 

机构地区：[1]Key Laboratory for Heavy Metal Pollution Control and Reutilization,School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen,518055,Guangdong,China [2]College of Health Science and Environmental Engineering,Shenzhen Technology University,Shenzhen,518118,Guangdong,China [3]State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China,Xi'an University of Technology,Xi'an,710048,Shaanxi,China [4]Department of Civil and Environmental Engineering,Virginia Polytechnic Institute and State University,Manassas,20147,Virginia,USA

出　　处：《Environmental Science and Ecotechnology》2022年第1期53-59,共7页环境科学与生态技术（英文）

基　　金：the Shenzhen Fundamental Research Programs(JCYJ20180503182122539,JCYJ20180503182130795,and GXWD20201231165807007-20200810165349001);the National Natural Science Foundation of China(51939009).

摘　　要：Bacteria are key denitrifiers in the reduction of nitrate(NO_(3)^(-)N),which is a contaminant in wastewater treatment plants(WWTPs).They can also produce carbon dioxide(CO_(2))and nitrous oxide(N2O).In this study,the autotrophic hydrogen-oxidizing bacterium Rhodoblastus sp.TH_(2)0 was isolated for sustainable treatment of NO_(3)^(-)N in wastewater.Efficient removal of NO_(3)^(-)N and recovery of biomass nitrogen were achieved.Up to 99%of NO_(3)^(-)N was removed without accumulation of nitrite and N2O,consuming CO_(2)of 3.25 mol for each mole of NO_(3)^(-)N removed.The overall removal rate of NO_(3)^(-)N reached 1.1 mg L^(-1)h^(-1)with a biomass content of approximately 0.71 g L^(-1)within 72 h.TH20 participated in NO_(3)^(-)N assimilation and aerobic denitrification.Results from 15N-labeled-nitrate test indicated that removed NO_(3)^(-)N was assimilated into organic nitrogen,showing an assimilation efficiency of 58%.Seventeen amino acids were detected,accounting for 43%of the biomass.Nitrogen loss through aerobic denitrification was only approximately 42%of total nitrogen.This study suggests that TH_(2)0 can be applied in WWTP facilities for water purification and production of valuable biomass to mitigate CO_(2)and N_(2)O emissions。

关 键 词：WASTEWATER NITRATE Hydrogen-oxidizing bacteria Autotrophic assimilation Aerobic denitrification 

分 类 号：X70[环境科学与工程—环境工程]