Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study  

作　　者：Xin Hu Hong Yang Xiaoyue Fang Xuyan Liu Jiawei Wang Xiaotong Wang Yongsheng Bai Bojun Su 

机构地区：[1]Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering,Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China [2]Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Beijing 100044,China [3]Hebei GEO University,Shijiazhuang 050031,China [4]Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources,Hebei University of Architecture,Zhangjiakou 075000,China [5]School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China [6]Beijing Drainage Group Co.Ltd.,Beijing 100022,China

出　　处：《Journal of Environmental Sciences》2025年第5期529-539,共11页环境科学学报(英文版)

基　　金：supported by Beijing Municipal Commission of Education(No.Z161100004516015);the Open Project Program of Hebei Center for Ecological and Environmental Geology Research(No.JSYF-202304).

摘　　要：As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively researched.However,achieving stable PNinmunicipalwastewater has always been challenging.In this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦C.The nitrogen removal performance and associated pathways,shifts in the microbial community as well as sludge yield were investigated.The results were as follows:the effluent TN and COD were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any othermeasures.The primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic denitrification.High-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial communities.In addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg COD.This study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关 键 词：Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield 

分 类 号：X70[环境科学与工程—环境工程]