Contaminated soil treatment improver and preparation method thereof

Abstract

The invention discloses a contaminated soil treatment improver and a preparation method thereof. The contaminated soil treatment improver comprises 33-45g of quick lime, 5-9g of charcoal, 15-22g of monopotassium phosphate, 18-25g of ground phosphate rock, 15-20g of modified humic acid, 3-8g of a dispersing agent, 2-6g of a wetting agent, 7-10g of ferric sodium ethylenediamine tetraacetate, 3-6g ofurea, 6-12g of a polymer water-retaining agent and 0-20ml of a biological bacterial fertilizer. Biochar is added and used together with the decarbonized lignite-based modified humic acid, so that theconcentrations of Cd, Pb and Zn can be greatly reduced, and the soil environment is improved; and humic acid subjected to ammoniation treatment by ammonium bicarbonate and the biological bacterial fertilizer are used together, so that soil salt-based ions can be reduced, and nutrients can be provided for crop growth.

Description

technical field [0001] The invention relates to the technical field of soil improver preparation, in particular to a contaminated soil treatment improver and a preparation method thereof. Background technique [0002] At present, with the development of the national economy and industrial technology, heavy metal pollutants in industrial and mining waste water, petroleum, and pesticides continue to enter the soil environment, causing some cultivated land to be polluted by heavy metals. Heavy metals in the soil are non-degradable in the natural state and can accumulate continuously in the soil, resulting in more and more serious harm and making the treatment of heavy metal-contaminated soil more difficult; in addition, heavy metals in the soil can also enter the groundwater through the water cycle , into the human body through drinking water, seriously endangering human health. Therefore, the remediation of heavy metal-contaminated soil is imminent. [0003] Heavy metal cont...

AI Technical Summary

Problems solved by technology

The guest-soil method has a large amount of engineering and high cost, and only removes the polluted soil from the polluted area and replaces it with clean soil or improved soil from other places, without substantially treating pollutants; The risk is high, and the secondary pollution problem brought to the soil has been paid more and more attention. The soil after remediation still needs to be further treated or improved before it can be used in agriculture; solidification and stabilization technology is to use physical or chemical methods to fix or stabilize soil pollutants. Transforming it into a chemically inactive form to prevent its migration and diffusion in the environment, thereby reducing its toxicity, has the characteristics of moderate cost, good effect, and short cycle. One of the best methods is generally to add soil conditioners to change the physical and chemical properties of the soil. Through the adsorption, precipitation or co-precipitation of heavy metals, the existing state of heavy metals in the soil is changed, thereby reducing their bioavailability and mobility. However, the existing improvers have strict requirements on the source of raw materials, and the raw materials are not easy to obtain. Although they can repair and improve the soil to a certain extent, they need to use other methods to improve the fertility of the repaired soil, and the function is single.