Organics Recovery from Waste Activated Sludge In-Situ Driving Efficient Nitrogen Removal from Mature Landfill Leachate:An Innovative Biotechnology with Energy Superiority

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外文摘要：The sustainable recovery and utilization of sludge bioenergy within a circular economy context has drawn increasing attention,but there is currently a shortage of reliable technology.This study presents an innovative biotechnology based on free nitrous acid(FNA)to realize sustainable organics recovery from waste activated sludge(WAS)in-situ,driving efficient nitrogen removal from ammonia rich mature landfill leachate by integrating partial nitrification,fermentation,and denitrification process(PN/DN-F/DN).First,ammonia((1708.5±142.9)mg·L-1)in mature landfill leachate is oxidized to nitrite in the aerobic stage of a partial nitrification coupling denitrification(PN/DN)sequencing batch reactor(SBR),with nitrite accumulation ratio of 95.4％±2.5％.Then,intermediate effluent(NO2--N-(1196.9±184.2)mg·L-1)of the PN/DN-SBR,along with concentrated WAS(volatile solids(VSs)-(15 119.8±2484.2)mg·L-1),is fed into an anoxic reactor for fermentation coupling denitrification pro-cess(F/DN).FNA,the protonated form of nitrite,degrades organics in the WAS to the soluble fraction by the biocidal effect,and the released organics are utilized by denitrifiers to drive NOx-reduction.An ultra-fast sludge reduction rate of 4.89 kg.m-3·d-1 and nitrogen removal rate of 0.46 kg·m-3·d-1 were realized in the process.Finally,F/DN-SBR effluent containing organics is refluxed to PN/DN-SBR for sec-ondary denitrification in the post anoxic stage.After 175 d operation,an average of 19 350.6 mg chem-ical oxygen demand organics were recovered per operational cycle,with 95.2％nitrogen removal and 53.4％sludge reduction.PN/DN-F/DN is of great significance for promoting a paradigm transformation from energy consumption to energy neutral,specifically,the total benefit in equivalent terms of energy was 291.8 kW·h·t-1 total solid.

外文关键词：

Waste activated sludgeBioresource recoverySimultaneous treatment of wastewater and sludgeMature landflll leachateFree nitrous acid

作者：

Fangzhai Zhang、Shang Ren、Haoran Liang、Zhaozhi Wang、Ying Yan、Jiahui Wang、Yongzhen Peng

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作者单位：

National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Engineering Research Center of Beijing,Beijing University of Technology,Beijing 100124,China

基金：

Beijing Natural Science FoundationKey Program of National Natural Science Foundation of ChinaYoung Elite Scientists Sponsorship Program by China association for science and technologyYoung Elite Scientists Sponsorship Program by China association for science and technologyYoung Elite Scientists Sponsorship Program by Beijing Association for Science and TechnologyYoung Elite Scientists Sponsorship Program by Beijing Association for Science and TechnologyInnovation and Entrepreneurship Leading Team Project in GuangzhouKey Research and Developmental Program of Shandong ProvinceCultivating Fund of Faculty of Environment and Life,Beijing University of Technology

项目编号：

822204052131004CASTYESS20220508BASTBYESS2023183CYLJTD-2016072020CXGC011404PY202302

出版年：

2024

DOI：

10.1016/j.eng.2023.03.005

工程(英文)

CSTPCDEI

ISSN：2095-8099

年,卷(期)：2024.34(3)