Management method of copper and pesticide combined polluted soil

Abstract

The invention provides a management method of copper and pesticide combined polluted soil. The management method comprises the following steps: firstly, digging soil of a copper and pesticide combinedpolluted land; treating the soil through a crushing machine to obtain soil grains with the size of 2 to 5mm; adding a dilute sulfuric acid solution into a soil solution and carrying out sufficient stirring and treatment, so as to transform a copper compound in the soil into copper sulfate; conveying the soil into a muffle furnace and carrying out high-temperature roasting for 2h; transferring thecopper sulfate into copper oxide through high-temperature pyrolysis; heating organic matters including organic chlorine and the like in the soil and decomposing into a gas-state matter, and separating from the soil; finally, sufficiently mixing the soil with carbon powder and calcium oxide according to a certain ratio; adding a proper amount of water and carrying out stirring treatment; then conveying a mixture into a vacuum heat treatment device, and heating and carrying out heat insulation for 30min; cooling and crushing; conveying into an electric sorting machine and sorting, so as to separate copper grains in the soil from the soil. The management method provided by the invention is simple in treatment method and short in technological flow; large-scale treatment is easy to realize, and the management method is especially suitable for repairing copper and organic chlorine heavily-polluted soil.

Description

Technical field: [0001] The invention relates to the technical field of soil pollution remediation, in particular to a treatment method for copper and pesticide compound polluted soil. technical background: [0002] The normal copper content in soil is 2-200mg / kg. The copper content in Chinese soil is 3-300 mg per kg, with an average of 22 mg per kg. Copper-based pesticides have good control effects on common fungal and bacterial diseases, and are widely used in facility production. However, copper-based pesticides can accumulate in the soil and be absorbed by crops. Some of the chemical pesticides applied to the soil are stable in chemical properties and last for a long time. The continuous use of large quantities of pesticides will cause them to accumulate in the soil, which will affect the yield and quality of crops to a certain extent and become pollutants. Soils near copper smelters contain high concentrations of copper. Both rock weathering and copper-containing wa...

AI Technical Summary

Problems solved by technology

Looking at these methods, the main problem is that most of the copper pollution cannot be completely repaired, and most of the organic pesticides are treated by oxidation, which consumes a lot of chemicals and is easy to cause secondary pollution. The overall problems are low repair efficiency, high treatment cost, Unable to effectively remove soil heavy metals and organic pollution sources