Study on the electrokinetic remediation technology of Cr(IV) polluted soil

摘要

Electrokinetic remediation is in-situ remediation technique. Potassium dichromate was chosen as the pollutant and its initial concentration was 500mgkg-l in Kaolin soil. This experiment, we are to study the feasibility ,the factors which influence the whole course, including applied voltage, treatment time, soil moisture, OH~- produced at the cathode and its control. It indicate that, there is separating out oxygen at anode, hydry at cathode. Cr_2O_7~(2-) and CrO_4~(2-) absorb electron to change to Cr~(3+), and unite to Cr(OH)_3. The experiment results show OH" produced at the cathode has crucial effects on the removal efficiency of chromium; secondly the applied voltage and treatment time have important influence on the efficiency, and the soil moisture affects the efficiency in some degree.