Electrokinetic enhanced bioremediation method for chlorinated hydrocarbon-heavy metal combined pollution low-permeability medium and application of electrokinetic enhanced bioremediation method for chlorinated hydrocarbon-heavy metal combined pollution low-permeability medium

The invention provides an electrokinetic enhanced bioremediation method for a chlorinated hydrocarbon-heavy metal combined pollution low-permeability medium and application. According to the method, an electric-biological enhancement technology and a sulfate reduction effect are combined, immobilization of the heavy metal in the low-permeability water-containing medium is enhanced, sulfate is firstly added into a water-containing layer, the heavy metal is immobilized through a sulfate reduction product to be detoxified, and then a dechlorinating microbial agent is added into the water-containing layer to degrade chlorinated hydrocarbon, so that the heavy metal in the low-permeability water-containing medium is degraded. And in-situ remediation of combined pollution is realized. Moreover, the added sulfate can be fixed by iron minerals in the aquifer after being reduced into sulfide through indigenous sulfate reducing bacteria, and secondary pollution caused by hydrogen sulfide is avoided; the introduced carbo