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Effects of acid,acid-ZVI/PMS,Fe(Ⅱ)/PMS and ZVI/PMS conditioning on the wastewater activated sludge(WAS)dewaterability and extracellular polymeric substances(EPS)

查看全文 作　　者：Xiaoyang [1]Fan;Yili [1,2]Wang;Daxin [1]Zhang;Yajie [1]Guo;Shihui [1]Gao;Enrui [1]Li;Huaili [3]Zheng 高影响力作者 机构地区：[1]College of Environmental Science and Engineering,Beijing Key Lab for Source Control Technology of Water Pollution,Beijing Forestry University,Beijing 100083,China;[2]Jinyun Forest Ecosystem Research Station,Beijing Forestry University,Beijing 100083,China;[3]Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment,State Ministry of Education,Chongqing University,Chongqing 400045,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2020年第32卷第5期,共12页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.51678035 and 51478041) 摘　　要：The effects of four conditioning approaches:Acid,Acid-zero-valent iron(ZVI)/peroxydisulfate(PMS),Fe(Ⅱ)/PMS and ZVI/PMS,on wastewater activated sludge(WAS)dewatering and organics distribution in supernatant and extracellular polymeric substances(EPS)layers were investigated.The highest reduction in bound water and the most WAS destruction was achieved by Acid-ZVI/PMS,and the optimum conditions were pH 3,ZVI dosage 0.15 g/g dry solid(DS),oxone dosage 0.07 g/g DS and reaction time 10.6 min with the reductions in capillary suction time(CST)and water content(Wc)as 19.67%and 8.49%,respectively.Four conditioning approaches could result in TOC increase in EPS layers and supernatant,and protein(PN)content in tightly bound EPS(TB-EPS).After conditioning,organics in EPS layers could migrate to supernatant.Polysaccharide(PS)was easier to migrate to supernatant than PN.In addition,Acid,Acid-ZVI/PMS or Fe(Ⅱ)/PMS conditioning promoted the release of some polysaccharides containing ring vibrations v P=O,v C-O-C,v C-O-P functional groups from TB-EPS.ESR spectra proved that both radicals of SO4-·and·OH contributed to dewatering and organics transformation and migration.CST value of WAS positively correlated with the ratios of PN/PS in LB-EPS and total EPS,while it negatively correlated with TOC,PN content and PS content in TB-EPS,as well as PS content in supernatant and LB-EPS.BWC negatively correlated to zeta potential and TOC value,PN content,and HA content in supernatant. 关 键 词：Conditioning approaches Acid-ZVI/PMS Wastewater activated sludge DEWATERABILITY EPS Radicals Correlation
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