The Effects Of Flying Dust Deposit On Farmland Soil Pollution And Study On Prediction And Remediation Of Contaminated Soil

With industrial development and modernization of agricultural production, environmental problems become increasingly serious. The recent spate of heavy metals pollution incident in China, to the local environment and people's health caused a greater impact. Shanxi coke, building materials, metal smelting and other larger proportion of heavily polluting industries, dust pollution is relatively serious. And the long years of the settlement of dust would also produce water and soil pollution, dust pollution in factories, mines and thus forecast survey the surrounding area of great significance to environmental hazards. In this paper, dust deposition generated by steel plant in Linfen and the surrounding soil was studied by collecting dust and soil samples,Analysis of dust deposition and with the physical and chemical properties of soil heavy metals in the vicinity of the relevance to understand dust generated by steel plant in Linfen on the surrounding environment; pot experiment was conducted to understand the plants on the absorption of Cd in soil, as well as adding EDTA on plant absorption of Cd and other trace elements in the impact of organic complexing agents to remove heavy metals in plants the role and feasibility. The results show that::(1) Dust deposition in Iron and Steel plant in Linfen is greater than the amount of the settlement of other sampling points.In all sampling points, the settlement amount of up to 3.73t/hm2.a, and along with the different seasons has shown some differences, on the whole in winter and spring than in summer and autumn. From the particle size analysis result, it seems,≤75um ratio of more than 50%, the smaller the dust particle size, pollutant concentration is relatively higher, the greater the impact on the environment. Dust generated by steel plant in Linfen can be different levels of soluble in water, weak acid, exchangeable extraction agents and organic solvents, in which the dissolution in weak acid in the largest volume. These dust floating in the air, human and other organisms may have a direct injury.With the role of rainwater will also enter the soil environment, which impact on the environment. In full amount analysis of heavy metals, Zn, Pb, Cd, Mn content is higher than the global average content of the soil and the local soil background values, especially Pb content is higher than the others.(2) In the vicinity of Iron and Steel Plant in Linfen, analysis of the entire amount of heavy metals in agricultural soils showed that, Cd, Cu, Cr, Zn, Pb exists a certain degree of enrichment phenomenon, with national quality secondary standard for soil (PH6.5-7.5) compared, Cd exceeded the rate of up to 100%, Cu exceeding the rate of up to 50%, while other elements were detected not exceeded. By heavy metals in soil and dust, comparison of results, in the detection of seven kinds of elements, each element in the content of the two are very close to, change only slightly.(3) The experimental results show that rapeseed plants, oilseed rape with the absorption of Cd content and Cd concentration in the soil increased and increased, but the Cd concentration and uptake were lower, while the biomass concentration of added Cd there is no major change in. Add a complexing agent EDTA, the plants not only failed to increase the absorption of Cd, but reduced this and Slat (1999) advocated by the plant purification method of heavy metals in soils contrary. The reason is EDTA added soil Cd has not only changed the combination of forms, but also changed the combination of trace elements in the soil of other states, especially Fe, Zn. As the plants to absorb the impact by the ions,thus adding EDTA, the plants actually reduce the absorption of Cd.