剩余污泥有机质资源回收利用原位驱动晚期垃圾渗滤液深度脱氮——一种具有显著能源优势的创新生物技术  

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

作　　者：Fangzhai Zhang Shang Ren Haoran Liang Zhaozhi Wang Ying Yan Jiahui Wang Yongzhen Peng 

机构地区：[1]National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Engineering Research Center of Beijing,Beijing University of Technology,Beijing 100124,China

出　　处：《Engineering》2024年第3期120-132,共13页工程（英文）

基　　金：supported by the Beijing Natural Science Foundation (8222040);Key Program of National Natural Science Foundation of China (52131004);Young Elite Scientists Sponsorship Program by China association for science and technology (CAST,YESS20220508);Young Elite Scientists Sponsorship Program by Beijing Association for Science and Technology (BAST,BYESS2023183);Innovation and Entrepreneurship Leading Team Project in Guangzhou (CYLJTD-201607);Key Research and Developmental Program of Shandong Province (2020CXGC011404);Cultivating Fund of Faculty of Environment and Life,Beijing University of Technology (PY202302).

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(NO_(2)^(-)-N=(1196.9±184.2)mg·L^(-1))of the PN/DN-SBR,along with concentrated WAS(volatile solids(VSs)=(15119.8±2484.2)mg·L^(-1)),is fed into an anoxic reactor for fermentation coupling denitrification process(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 secondary denitrification in the post anoxic stage.After 175 d operation,an average of 19350.6 mg chemical 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.

关 键 词：Waste activated sludge Bioresource recovery Simultaneous treatment of wastewater and sludge Mature landfill leachate Free nitrous acid 

分 类 号：X703[环境科学与工程—环境工程]