Chromium pollution soil restoration agent, and preparation method and application thereof

Abstract

The invention discloses a chromium pollution soil restoration agent, and a preparation method and application thereof. The soil restoration agent is prepared from the following raw materials in parts by mass: 88 to 100 parts of camphor wood, 23 to 28 parts of limonite, 14 to 19 parts of calcium silicate, 18 to 24 parts of potassium phosphate and 27 to 36 parts of nitro ammonium phosphate, wherein the mass ratio of the potassium phosphate to the nitro ammonium phosphate is 2:3; the camphor wood and the limonite are respectively smashed, sieved, dried and mixed; the mixture is put into a nitric acid solution to be subjected to soaking treatment; filtering is performed to obtain a mixture A; the mixture A and the calcium silicate are uniformly mixed; the mixture is put into a microwave field to be subjected to microwave heating treatment to obtain a mixture B; cleaning and drying are performed; the mixture is mixed with the potassium phosphate and the nitro ammonium phosphate; packaging is performed to obtain the chromium pollution soil restoration agent. The excellent chromium fixing and soil fertility restoration efficacies are achieved, so that the leaching rate of chromium metal in soil is greatly reduced, and the soil restoration agent reaches and superior to the first-level standard of national Soil Environmental Quality Standard (GB15618-1995).

Description

technical field [0001] The invention relates to the technical field of pollution treatment, in particular to a chromium-contaminated soil remediation agent and a preparation method and application thereof. Background technique [0002] At present, the area of ​​heavy metal polluted soil in China is at least 20 million hectares. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, and urban transportation. Vehicle exhaust emissions, improper disposal of electronic waste, etc., will lead to heavy metal pollution in the soil. Soil heavy metal pollution has the characteristics of poor mobility, long residence time, and irreversibility of pollutants in the soil, resulting in decreased soil fertility, reduced crop yield and quality, and polluted groundwater and surface water through runof...

AI Technical Summary

Problems solved by technology

At present, the remediation technologies for hexavalent chromium-contaminated soil mainly include immobilization / stabilization, leaching method, soil washing method, electrokinetic remediation method, chemical reduction method, phytoremediation, and microbial remediation. The overall remediation efficiency is low and the treatment cost is high. question

Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

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