Adsorption of Pb~（2＋） and Zn~（2＋） in Water by Extracelluar Polymeric Substances from Activated Sludge in Aeration Pool
Abstract：Extracelluar polymeric substances,extracted from activated sludge in aeration pool,were used as biosorbent.Adsorption ability of EPS for Pb2＋ and Zn2＋ removal under different experimental conditions was studied.This paper focuses on the influences of adsorption time,pH value,dosage of extracelluar polymeric substances,and coexistence of Pb2＋、Zn2＋.The results show that the adsorption equilibrium will be reached at respectively 30 min and 60 min for Pb2＋、Zn2＋,and that with the rise of pH value the removal rate will first rise then fall,and when the pH value is 6,EPS dosage is 371.67 mg/L and 123.89 mg/L,the maximum removal rate for Pb2＋ and Zn2＋ can reach to 52.17% and 39.83%,and that when Pb2＋、Zn2＋ coexist,the removal rate of EPS on Pb2＋、Zn2＋ will be decreased,and the EPS＇s selective adsorption of Pb2＋ is stronger than that of Zn2＋.
Keywords：activated sludgeextracelluar polymeric substancesabsorptionlead ionzinc ion
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 54-57 )