In-Situ immobilization of heavy-metal contaminated soil by electrokinetic phosphoric acid injection

摘要

PURPOSE: Provided is an in-situ immobilization method of lead in soil by electrokinetic phosphorous injection, in which lead in contaminated soil is led to a contamination source by electric ion transportation effect and immobilized in the contamination source under ground, so it is applicable to soil remediation without excavation. CONSTITUTION: The method comprises the steps of burying a plurality of positive and negative electrodes(2,4) under ground in vertical or horizontal direction, and applying DC power to the electrodes(2,4), wherein the positive electrodes(2) are supplied with aqueous solution(3) and the negative electrodes(4) are supplied with mixture solution of chlorine acid and phosphoric acid(5) by a metering pump, wherein the positive electrode(2) is connected with a water level adjusting device(6), wherein the electrodes(2,4) are made of inert conductive material.