System method for quickly repairing heavy metal contaminated farmland

Abstract

The invention provides a system method for quickly repairing a heavy metal contaminated farmland, and belongs to the field of heavy metal contaminated soil repair. The steps comprise: (1) detecting the heavy metal contents in soils with different depths; (2) isolating pollution sources; (3) constructing an irrigation and drainage system, and carrying out drainage and waterlogging control; (4) applying a heavy metal passivating agent to the surface layer soil, and uniformly mixing through rotary tillage; (5) determining the deep turning depth of the soil according to the step (1), carrying outdeep turning, supplying a fertilizer to the surface soil, and uniformly mixing; (6) detecting the heavy metal content of the tillage layer soil; and (7) according to the step (6), dividing the farmland into a large amount of heavy metal content standard areas and a small amount of heavy metal content slight over-standard areas, performing normal production in the standard areas, and carrying out plant extraction repair on the slight over-standard areas. According to the present invention, physical restoration, chemical restoration, biological restoration and the like are combined to form a system method having strong operability and suitable for large-area promotion so as to provide the important significance in the implementing of the Action Plan for Soil Pollution Prevention and Control,the safe planting, the improving of farmland utilization rate and the solving of various defects of the existing single repair methods.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and in particular relates to a systematic method for rapidly remediating heavy metal-contaminated farmland. Background technique [0002] The southern part of my country has abundant rainfall, and the cultivated land is mainly paddy fields, and there are a large number of cold soaked fields. Taking Hubei Province as an example, its paddy fields account for about 59% of the total cultivated land, and cold soaking fields account for about 15% of the total paddy fields. The "National Soil Pollution Survey Bulletin" pointed out that the rate of soil points exceeding the standard in cultivated land in the country accounted for 19.4%, and heavy metal inorganic pollutants were the main pollutants. Heavy metals in cultivated land mainly come from external pollution such as mineral resource development, sewage irrigation, discharge of "three wastes" from heavy-duty enterprises,...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing single repair method in terms of repair cost, repair time, target accessibility and self-defects, based on the actual situation of polluted farmland in my country, the present invention combines physical repair, chemical repair and biological repair to provide a A systematic remediation method for rapid remediation of heavy metal-contaminated farmland