摘要
[Objectives] This study was conducted to explore the effect of electrokinetic remediation of Cd-contaminated soil.[Methods] By preparing Cd-contaminated soil and constructing an electrokinetic remediation experimental device,the effects of changing remediation time,voltage gradient,electrolyte type and power-on method on the removal rate of Cd were studied.[Results]When the voltage gradient was increased from 0.5 to 1.0 V/cm,the total Cd removal rate increased by 13%;and when the voltage gradient was increased from 1.0 to 1.5 V/cm,the total Cd removal rate only increased by 3%.Compared with 72 h of electrokinetic remediation,96 h of remediation increased the remediation rate by 4%,and the total energy consumption increased by 13%,while 120 h of remediation increased the remediation rate by 6.5%,and the total energy consumption increased by 67%.Compared with citric acid as electrolyte,the remediation rate of the acetic acid group increased by 12%,and the total energy consumption increased by 42%,while the remediation rate of the hydrochloric acid group increased by18%,and the total energy consumption increased by 70.5%.Compared with the conventional remediation method,the total Cd removal rates achieved by the different power-on methods increased by 9% and 31%,respectively,and the total energy consumption decreased by 58% and 45%,respectively.[Conclusions]The electrokinetic remediation technology has certain advantage in remediating Cd-contaminated soil.
[Objectives] This study was conducted to explore the effect of electrokinetic remediation of Cd-contaminated soil. [Methods] By preparing Cd-contaminated soil and constructing an electrokinetic remediation experimental device,the effects of changing remediation time,voltage gradient,electrolyte type and power-on method on the removal rate of Cd were studied. [Results]When the voltage gradient was increased from 0. 5 to 1. 0 V/cm,the total Cd removal rate increased by 13%; and when the voltage gradient was increased from 1. 0 to 1. 5 V/cm,the total Cd removal rate only increased by 3%. Compared with 72 h of electrokinetic remediation,96 h of remediation increased the remediation rate by 4%,and the total energy consumption increased by 13%,while 120 h of remediation increased the remediation rate by 6. 5%,and the total energy consumption increased by 67%. Compared with citric acid as electrolyte,the remediation rate of the acetic acid group increased by 12%,and the total energy consumption increased by 42%,while the remediation rate of the hydrochloric acid group increased by18%,and the total energy consumption increased by 70. 5%. Compared with the conventional remediation method,the total Cd removal rates achieved by the different power-on methods increased by 9% and 31%,respectively,and the total energy consumption decreased by 58% and 45%,respectively. [Conclusions]The electrokinetic remediation technology has certain advantage in remediating Cd-contaminated soil.
