首页|Disentangling microbial coupled fillers mechanisms for the permeable layer optimization process in multi-soil-layering systems
Disentangling microbial coupled fillers mechanisms for the permeable layer optimization process in multi-soil-layering systems
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The multi-soil-layering(MSL)systems is an emerging solution for environmentally-friendly and cost-effective treatment of decentralized rural domestic wastewater.However,the role of the seemingly simple permeable layer has been overlooked,potentially holding the break-throughs or directions to addressing suboptimal nitrogen removal performance in MSL sys-tems.In this paper,the mechanism among diverse substrates(zeolite,green zeolite and bio-logical ceramsite)coupled microorganisms in different systems(activated bacterial powder and activated sludge)for rural domestic wastewater purification was investigated.The re-moval efficiencies performed by zeolite coupled with microorganisms within 3 days were 93.8％for COD,97.1％for TP,and 98.8％for NH4+-N.Notably,activated sludge showed bet-ter nitrification and comprehensive performance than specialized nitrifying bacteria pow-der.Zeolite attained an impressive 89.4％NH4+-N desorption efficiency,with a substantive fraction of NH4+-N manifesting as exchanged ammonium.High-throughput 16S rRNA gene sequencing revealed that aerobic and parthenogenetic anaerobic bacteria dominated the reactor,with anaerobic bacteria conspicuously absent.And the heterotrophic nitrification-aerobic denitrification(HN-AD)process was significant,with the presence of denitrifying phosphorus-accumulating organisms(DPAOs)for simultaneous nitrogen and phosphorus removal.This study not only raises awareness about the importance of the permeable layer and enhances comprehension of the HN-AD mechanism in MSL systems,but also provides valuable insights for optimizing MSL system construction,operation,and rural domestic wastewater treatment.
Rural domestic wastewaterMulti-soil-layering(MSL)systemHeterotrophic nitrification-aerobicdenitrification(HN-AD)Nitrogen and phosphorus removalMicrobial evolution
Daxin Sun、Chuanping Feng、Yongheng Zhan、Bingbing Deng、Duoduo Mei、Nan Chen、Weiwu Hu
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School of Water Resources and Environment,MOE Key Laboratory of Groundwater Circulation and Environmental Evolution,China University of Geosciences(Beijing),Beijing 100083,China
Journal Center,China University of Geosciences(Beijing),Beijing 100083,China
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