Method and application for remedying DDT-contaminated soil through plant-microorganism combination

Abstract

The invention relates to plant-microorganism combination remediation technologies of DDT-contaminated soil, in particular to a method and application for remedying DDT-contaminated soil through a plant-microorganism combination. According to the method and application for remedying the DDT-contaminated soil through the plant-microorganism combination, the DDT-contaminated soil is remedied in the manner that ryegrass is planted in the DDT-contaminated soil and DDT degrading bacteria and plant growth promoting rhizobacteria are exerted on the DDT-contaminated soil, then overground ryegrass is harvested, and DDT in the soil is removed. The method and application for remedying the DDT-contaminated soil through the plant-microorganism combination comprise the following steps that in a DDT-contaminated farmland greenhouse, before the ryegrass is planted, a plough layer of the soil is turned over and flattened manually, and the DDT degrading bacteria are added; the ryegrass is sown, weeding is conducted at regular intervals, and after the ryegrass grows for one month, the plant growth promoting rhizobacteria are added; the overground part and the underground part of the ryegrass are harvested; and the DDT contents of the overground part and the underground part of the ryegrass are measured, and the DDT removal amount of the soil is measured. By the adoption of the method and application for remedying the DDT-contaminated soil through the plant-microorganism combination, the DDT in the soil can be effectively removed, the degradation rate of the DDT is high, the DDT content of the overground part of the ryegrass is low, and the risk that the DDT enters a food cycle along with the plants is lowered; and the method is simple in operation, safe, high in efficiency, low in cost and high in economic and social benefit.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted environment, in particular to a method and application of plant-microbial remediation of DDT polluted soil. Background technique [0002] Pesticides are one of the main sources of soil pollution. When DDT is applied to the field as a pesticide, 10% of it will be attached to the crops, and the remaining 90% will be scattered around or landed on the field. The Ministry of Agriculture’s sample survey of more than half of the provincial capital cities in the country shows that the pesticide pollution rate in vegetables is as high as 31.3%. And other products also contain organochlorine pesticides exceeding the standard. Therefore, pesticide pollution is differently ignored. [0003] Phytoremediation technology is to use the ability of green plants to tolerate and accumulate pollutants in the normal growth stage to fix, transfer, absorb, absorb and degrade pollutants. Compared with o...

AI Technical Summary

Problems solved by technology

The cost of physical and chemical repair methods is high, the removal is not complete, and chemical methods are easy to cause secondary pollution

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