The Plant-chemical Combined Remediation Of Cu/Cd/Zn/Pb Contamination Soil In Da Maoping Copper Mine

As one of the necessary means of production for human survival and development and urban construction, soil is the most important natural resources and material guarantee.However, with the rapid development of industry and agriculture, the pollution of heavy metals in the soil plant environment system has become more and more serious. At present domestic and foreign soil heavy metal pollution remediation measures mainly include physical measures, chemical measures, biological measures, agricultural ecological restoration measures. Among them, phytoremediation measures as a kind of green and ecological restoration technology, use some super accumulation plant absorption, enrichment and transformation of heavy metals in the soil.Compared to other repair measures, is safe,simple, environmental, economic and other advantages. But in the actual soil remediation, the use of plants and chemical remediation technology can be more effective to solve the problem of heavy metal pollution in soil, although this research has made great progress, but there are still many problems to be solved.This experiment using pot experiment, selected four kinds of plants, sunflower, rapeseed,ryegrass and Chinese cabbage respectively combined with four amendments, fused calcium magnesium phosphate and lime, charcoal and bentonite of DAMAOPING copper contaminated soil in mining areas for research and restoration, the main research results are as follows:(1) Test used in the repair sunflower plants, rape and Ryegrass and Chinese cabbage are on soil copper, cadmium, zinc and cadmium pollution has certain tolerance, compared to individual plant, and its modified agent combined with phytoremediation are different degree on plant growth performance a role in promoting. Especially the application of bentonite and lime has a very significant effect on increasing the biomass of plants.(2) Compared with individual plant, the content of copper, cadmium, zinc and lead in the shoot and root of sunflower, rape, rye grass and cabbage were decreased by applying the improved agent.The concentration of Cd in rape and Chinese cabbage plants is shoot > root,the concentrations of copper, cadmium, zinc and lead in sunflower and ryegrass plant is root>shoot, the concentrations of Cu, Zn and Pb in rape and cabbage were all shown to be theroot of the above ground parts. Obviously, rape and Chinese cabbage can enrich the cadmium.In addition, compared with the four kinds of plants in the body of different heavy metal enrichment, ryegrass on the absorption of copper is strong, rape on cadmium, zinc, lead adsorption capacity.(3) It is higher than that of single plant, fused calcium magnesium phosphate and lime,bentonite and charcoal plant combined repair are on soil have certain curing effect, and the overall effect of curing performance for lime > bentonite bentonite > calcium magnesium phosphate > bamboo charcoal are different degrees of reduced soil effective state of heavy metals copper, cadmium, zinc and lead content. On the whole, it is more effective to reduce the content of exchangeable Cu, CD, Zn and Pb in soil by applying lime and bentonite.The results showed that the application of the improved agent combined with plants to repair the contaminated soil in the mining area has a certain effect, and the plant chemical restoration method has great potential for application in the ecological restoration practice of the mining area.