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)  

作　　者：Xiaoyang Fan Yili Wang Daxin Zhang Yajie Guo Shihui Gao Enrui Li Huaili Zheng 

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

出　　处：《Journal of Environmental Sciences》2020年第5期73-84,共12页环境科学学报（英文版）

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 

分 类 号：X703[环境科学与工程—环境工程]