A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage  

作　　者：Lin Cao Rong Sun Wenyi Dong Hongjie Wang Zhongyi Dai Xue Wang Jin Xie Hua Li 

机构地区：[1]School of Chemical Engineering,Huaqiao University,Xiamen 361021,China [2]State Key Laboratory of Urban Water Resource and Environment School of Environment,Harbin Institute of Technology,Harbin 150090,China [3]School of Civil and Environmental Engineering,Harbin Institute of Technology Shenzhen,Shenzhen 518055,China [4]Central and Southern China Municipal Engineering Design&Research Institute Co.,Ltd.,Wuhan 430010,China [5]Shenzhen Water Group Co.,Ltd.,Shenzhen 518000,China

出　　处：《Journal of Environmental Sciences》2023年第2期758-768,共11页环境科学学报（英文版）

基　　金：supported by a project of Shenzhen Science and Technology Plan (No. KCXFZ202002011006362);Project of Central and Southern China Municipal Engineering Design & Research Institute Co.,Ltd. (Technology Development 2019)

摘　　要：To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was developed.The reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone(R zone)was investigated during the long-term operation.The best performance was obtained at the R zone’s Oxidation-Reduction Potential(ORP)of-50±30 mV and hydraulic residence times(HRT)of 1.2 hr.The average effluent COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N of the R-MAO process were 18.0±2.3,7.5±0.6,1.0±0.5 and 4.6±0.4 mg/L,respectively,with the corresponding removal efficiency of COD,TN and NH_(4)^(+)-N were 92.9%±1.0%,84.1%±1.5% and 97.5%±1.1%.Compared to the sole MAO system,the TN removal efficiency of the R-MAO increased by 10.1%.Besides,under the optimal conditions,the contribution of the R zone in the R-MAO that removal COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N were 0.36,0.15,0.032 and 0.82 g/day.High-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae(5.20%),OLB8(1.04%)and Ottowia(1.03%)played an important role in denitrification in the R zone.This study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment.

关 键 词：Advanced nitrogen removal Multistage anoxic/aerobic process Sludge regeneration zone(R zone) Microbial community 

分 类 号：X799.3[环境科学与工程—环境工程]