The Research Of Passivator Repair For Plant Rice On Soil Polluted By Cadmium And Lead

With the speeding up of industrialization and urbanization in modern society, the soil heavy metal pollution is increasingly serious, has gradually become one of the environmental issues of common concern to the world. Soil heavy metal pollution not only causes soil degradation, reduce the quality of soil and crop productivity, and enrichment of heavy metals also can be through the food chain, ultimately endanger human body health. Therefore, to take effective measures to heavy metal pollution restoration of soil samples, has the vital significance. Tongling is China’s important copper, iron, sulfur, and gold production base, with more than 3000 years of mining history, the large amount of tailings in mineral process, becoming the most important sources of heavy metal pollution in the environment system, this also causes tongling area of soil heavy metal exceeds bid, with Cd and Pb and among them is more serious.This study by selecting there a pyrite mine’s Cd and Pb pollution serious soil samples in pot experiment, applying biological organic fertilizer, lime, biological fertilizer, diatomite and apatite passivator on heavy metal cadmium and lead pollution of soil restoration research, to explore different passivator on heavy metal contaminated soil repair effect, and select suitable for field soil polluted by cadmium and lead passivator repair measures.Through pot experiment to the following conclusion:1、Apatite, hydrated lime, biological fertilizer, biochar, biological organic fertilizer and diatomite six passivator processing can reduce the Cd content of rice kernels. Biological fertilizer, biological organic fertilizer processing and hydrated lime treatment effect is most obvious, rice grain Cd content was reduced by 32.4%, 19.1% and 18.2%, respectively.2、Apatite, diatomite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivator processing can reduce the content of rice grain Pb, biological organic fertilizer treatment, hydrated lime treatment and biological treatment to reduce rice grain Pb content effect is more obvious, the rice grain Pb content was reduced by 40.1%,19.4% and 40.1% respectively.3、Apatite, diatomite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivating treatment did not significantly reduce the amount of soil Cd and Pb content, this is mainly because after passivation agent to join the soil, just change the configuration of soil heavy metals and biological effectiveness.4、Apatite, diatomite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivator processing can reduce the soil DTPA effective state of Cd content, including the effect of biological organic fertilizer and hydrated lime to. In three rice reproductive period, biological organic fertilizer and hydrated lime soil DTPA effective state Cd content was reduced by 12.5%,11.3% and 14.2%, respectively, and 8.2%,8.5% and 13.7%.5、Apatite, diatomite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivator processing can reduce the DTPA soil effective state content of Pb, in which the effect of biological organic fertilizer and biochar to. In three rice reproductive period, biological organic fertilizer and biological carbon DTPA soil effective state Pb content was reduced by 4.2%, 25.0% and 10.4%, respectively, and 2.1%,21.4% and 4.3%.6、Diatomite, apatite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivator processing can improve the soil pH value, apatite, hydrated lime treatment to improve the effect of soil pH value is more apparent.7、Diatomite, apatite, hydrated lime, biological fertilizer, biological carbon and biological organic fertilizer and so on six kinds of passivator processing can improve the alkali solution nitrogen, phosphorus and available potassium content. With biological organic fertilizer, biological fertilizer and biochar effect is obvious.