Chromium-contaminated soil humic acid environment-friendly in-situ restoration process

Abstract

Humic acid green in-situ restoration process of chromium-contaminated soil, the first step is to add humic acid substances with a chromium ratio of 5-20:1 when the chromium-contaminated soil is crushed; the second step is to restore the chromium-contaminated soil less than 3mm After more than 1 hour, according to the detected hexavalent chromium content, spray into the strong reducing agent solution according to the chromium ratio of 10-30:1, mix well and force reduction; the third step is to spray the chromium-contaminated soil into the soil after reduction The ratio of 1‑5:100 liquid humic acid is granulated and granulated, which wraps and blocks the exudation and migration of hexavalent chromium in the particles, realizes permanent reduction and fixation, and restores the function of soil planting.

Description

1. Technical field [0001] The humic acid green in-situ restoration process for chromium-contaminated soil provided by the invention relates to the purification and treatment of polluted soil, in particular to the restoration of chromium-contaminated soil. 2. Background technology [0002] Soil pollution will pose a serious threat to the ecological environment, food safety and human health. In recent years, soil pollution caused by heavy metal pollutants has been particularly prominent, and soil contaminated by chromium is the most important. [0003] There are nearly 70 major chromium slag-contaminated sites in China, together with a large number of electroplating and leather enterprises, which have caused serious soil chromium pollution, threatening or endangering groundwater and drinking water sources. In addition, municipal solid waste (sludge, fly ash, garbage) and phosphate fertilizers contain chromium. Due to the agricultural reuse of these solid wastes with certain fe...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the shortcomings of the existing chromium-contaminated soil remediation technology and to invent a humic acid green in-situ remediation process for chromium-contaminated soil, which can reduce the ratio of agent to soil by adding humic acid substances in the crushing process and realize Mix evenly and intensify in-situ reduction to avoid the hidden danger of sudden leachate pollution; and use strong reducing agent to ensure that the treated soil reaches the standard, shorten the reduction reaction and aging time, and eliminate the potential pollution of sudden leachate; it can also be granulated by liquid humic acid Granulating, wrapping and blocking the exudation and migration of hexavalent chromium in the particles, realizing permanent reduction and fixation, restoring the function of soil planting, and realizing safe, low-cost, permanent and sustainable green in-situ restoration