▎ 摘　　要

NOVELTY - A heavy metal composite polluted soil in situ repairing method involves adding exogenous additive such as organic matter, zeolite and phosphate to the polluted soil, loosening the polluted soil, mixing the polluted soil and organic matter, zeolite and phosphate and other exogenous additives uniformly, placing for 5-7 days to the polluted soil for repairing treatment, uniformly mixing the heavy metal ion passivant with water according to the proportion of 1:15, uniformly spraying the mixed solution on the polluted surface of the soil, planting the ciliate desert-grass and small scale moss grass in the processed soil, after the plant is mature in the 3-4 month, pulling the plant root, drying and burning, adding the ash after burning into the solution, inserting the graphite electrode into the solution, applying a direct current voltage on the graphite electrode, forming a direct current electric field between two graphite electrodes. USE - The process used for repairing heavy metal composite polluted soil in situ by combining plant. ADVANTAGE - The method can gather the heavy metal pollutant on the surface of the graphite electrode by setting the graphite electrode, then removing the water in the vicinity of the electrode to remove the heavy metal pollutant, at the same time, by adding the heavy metal passivator, it can reduce the activity of the heavy metal ion; the heavy metal ion is more easily focused on the surface of the graphite electrode; it is more comprehensive and complete to remove the heavy metal pollutant. DETAILED DESCRIPTION - A heavy metal composite polluted soil in situ repairing method involves adding exogenous additive such as organic matter, zeolite and phosphate to the polluted soil, loosening the polluted soil, mixing the polluted soil and organic matter, zeolite and phosphate and other exogenous additives uniformly, placing for 5-7 days to the polluted soil for repairing treatment, uniformly mixing the heavy metal ion passivant with water according to the proportion of 1:15, uniformly spraying the mixed solution on the polluted surface of the soil, planting the ciliate desert-grass and small scale moss grass in the processed soil, after the plant is mature in the 3-4 month, pulling the plant root, drying and burning, adding the ash after burning into the solution, inserting the graphite electrode into the solution, applying a direct current voltage on the graphite electrode, forming a direct current electric field between two graphite electrodes, gathering the heavy metal pollutant near the graphite electrode, removing the water in the vicinity of the graphite electrode to remove the heavy metal pollutant.