摘要
Two combinations of bioleaching and electrokinetic remediation were used to remove copper(Cu)and zinc(Zn)from municipal sludge.The results show that bioleaching and electrokinetic remediation technology could remove copper and zinc from the sludge effectively.After performing bioleaching first and then electrokinetic remediation,the concentration of Cu and Zn in the solid phase of the sludge was 63.5 and 50 mg/kg;the concentration of Cu and Zn in the liquid phase was 3 and 30 mg/kg.After bioleaching and electrokinetic remediation were conducted simultaneously,the ferrous ions added in the early electrokinetic process migrated to the cathode zone,so that bioleaching energy was insufficient in the later stage to affect the conversion of heavy metals bound to sulfides,and the concentration of Cu and Zn in the solid and liquid phase of sludge was relatively high.After bioleaching and electrokinetic remediation,sulfide bound Cu was converted into residual Cu and carbonate bound Cu,while carbonate and sulfide bound Zn were converted into residual Zn in the solid phase.
Two combinations of bioleaching and electrokinetic remediation were used to remove copper( Cu) and zinc( Zn) from municipal sludge. The results show that bioleaching and electrokinetic remediation technology could remove copper and zinc from the sludge effectively. After performing bioleaching first and then electrokinetic remediation,the concentration of Cu and Zn in the solid phase of the sludge was 63. 5 and 50 mg/kg; the concentration of Cu and Zn in the liquid phase was 3 and 30 mg/kg. After bioleaching and electrokinetic remediation were conducted simultaneously,the ferrous ions added in the early electrokinetic process migrated to the cathode zone,so that bioleaching energy was insufficient in the later stage to affect the conversion of heavy metals bound to sulfides,and the concentration of Cu and Zn in the solid and liquid phase of sludge was relatively high. After bioleaching and electrokinetic remediation,sulfide bound Cu was converted into residual Cu and carbonate bound Cu,while carbonate and sulfide bound Zn were converted into residual Zn in the solid phase.
基金
Supported by National Natural Science Foundation of China(21567010)
