Effects of alkalinity on interaction between EPS and hydroxy-aluminum with different speciation in wastewater sludge conditioning with aluminum based inorganic polymer flocculant

查看全文 作　　者：Weijun [1,2]Zhang;Mingyue [1]Tang;Dandan [1]Li;Peng [3]Yang;Shiwei [4]Xu;Dongsheng [1]Wang

机构地区：[1]School of Environmental Studies,China University of Geosciences,Wuhan 430074,China;[2]Hubei Provincial Engineering Research Center of Systematic Water Pollution Control,Wuhan 430074,China;[3]School of Civil and Architecture Engineer,Northeast Electric Power Uniuersity,Jilin 132012,China;[4]CECEP Engineering Technology Research Institution,Beijing 100082,China

出　　处：《Journal of Environmental Sciences》索引2021年第33卷第2期,共12页

基　　金：the National Natural Science Foundation of China(Nos.51678546 and 41630318);the Chinese Universities Scientific Fund of China University of Geosciences(Wuhan);the Major Science and Technology Program for Water Pollution Control and Treatment(No.2018 ZX 07110004)。 摘　　要：Extracellular polymeric substances(EPS)form a stable gel-like structure to combine with water molecules through steric hindrance,making the mechanical dewatering of wastewater sludge considerably difficult.Coagulation/flocculation has been widely applied in improving the sludge dewatering performance,while sludge properties(organic fraction and solution chemistry conditions)are highly changeable and have important effects on sludge flocculation process.In this work,the alkalinity effects on sludge conditioning with hydroxy-aluminum were comprehensively investigated,and the interaction mechanisms between EPS and hydroxy-aluminum with different speciation were unraveled.The results showed that the effectiveness of hydroxy-aluminum conditioning gradually deteriorated with increase in alkalinity.Meanwhile,the polymeric hydroxy-aluminum(Al 13)and highly polymerized hydroxy-aluminum(Al 30)were hydrolysed and converted into amorphous aluminum hydroxide(Al(OH)3),which changed the flocculation mechanism from charge neutralization and complexing adsorption to hydrogen bond interaction.Additionally,both Al 13 and Al 30 showed higher binding capacity for proteins and polysaccharides in EPS than monomeric aluminum and Al(OH)3.Al 13 and Al 30 coagulation changed the secondary structure of proteins in EPS,which caused a gelation reaction to increase molecular hydrophobicity of proteins and consequently sludge dewaterability.This study provided a guidance for optimizing the hydroxy-aluminum flocculation conditioning of sludge with high solution alkalinity. 关键词：Coagulation/flocculation Hydroxy-aluminum Hydrolysis reaction Extracellular polymeric substances

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Effects of alkalinity on interaction between EPS and hydroxy-aluminum with different speciation in wastewater sludge conditioning with aluminum based inorganic polymer flocculant

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