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

作     者：Weijun Zhang Mingyue Tang Dandan Li Peng Yang Shiwei Xu Dongsheng Wang Weijun Zhang;Mingyue Tang;Dandan Li;Peng Yang;Shiwei Xu;Dongsheng Wang

作者机构：School of Environmental StudiesChina University of GeosciencesWuhan 430074China Hubei Provincial Engineering Research Center of Systematic Water Pollution ControlWuhan 430074China School of Civil and Architecture EngineerNortheast Electric Power UniuersityJilin 132012China CECEP Engineering Technology Research InstitutionBeijing 100082China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2021年第33卷第2期

页      面：257-268页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

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) 

主　　题：Coagulation/flocculation Hydroxy-aluminum Hydrolysis reaction Extracellular polymeric substances 

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 ***/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 *** 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 *** results showed that the effectiveness of hydroxy-aluminum conditioning gradually deteriorated with increase in ***,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 ***,both Al 13 and Al 30 showed higher binding capacity for proteins and polysaccharides in EPS than monomeric aluminum and Al(OH)*** 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 *** study provided a guidance for optimizing the hydroxy-aluminum flocculation conditioning of sludge with high solution alkalinity.