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Heavy metal contaminated soil humic acid green in-situ curing repair technology

A technology of contaminated soil and in-situ solidification, applied in the field of remediation of chromium-contaminated soil, can solve the problems of reducing the ratio of agent to soil, shortening the reduction reaction and aging time, etc.

Inactive Publication Date: 2019-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the deficiency of the existing heavy metal contaminated soil remediation technology and to invent a kind of green in-situ solidification repair process of humic acid in heavy metal 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; it can also be granulated and granulated by humic acid to block the seepage and migration of heavy metals in the particles, ensure that the soil is treated up to standards, shorten the reduction reaction and aging time, Eliminate the hidden dangers of sudden leachate pollution; it can also continue to produce humic acid through semi-burning bacterial fertilizers to ensure that the water-stable aggregates of humic acid soil are not damaged, realize permanent restoration and fixation, restore soil self-repair and planting and greening functions, and achieve safety , low-cost permanent sustainable green in-situ restoration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, the first step, when chromium-contaminated soil is added to the cone crusher, add 50% sodium humate solution for pre-reduction according to the chromium ratio of 10:1, and strengthen the mixing with sodium humate while the chromium-contaminated soil is crushed ; Due to the full contact of hexavalent chromium and sodium humate on the fresh interface produced by pulverization, the in-situ reduction reaction is strengthened, and the reduction rate (>96%) of humic acid material utilization rate and hexavalent chromium is improved, and after aging for 24 hours, Humic acid promotes the granulation of the soil and blocks the exudation and migration of hexavalent chromium in the particles; in the second step, 1%-3% semi-coke fertilizer is added to the reduced chromium-contaminated soil and mixed evenly, eliminating dust and reducing The ratio of agent to soil reduces the stacking amount and aging time of chromium-contaminated crushed soil, realizes permanent restorati...

Embodiment 2

[0022] Example 2, the first step, while adding the chromium-contaminated soil to the cone crusher, add biomass pyrolysis oil for pre-reduction according to the chromium ratio of 10:1, and strengthen the mixing with biomass pyrolysis oil while the chromium-contaminated soil is crushed ; Due to the full contact of hexavalent chromium on the fresh interface produced by crushing with biomass pyrolysis oil, the in-situ reduction reaction is strengthened, the utilization rate of biomass pyrolysis oil and the reduction rate of hexavalent chromium (>96%) are improved, and dust is eliminated , reducing the ratio of agent to soil and repair cost, reducing the stacking amount and aging time of chromium-contaminated crushed soil; in the second step, after aging the reduced chromium-contaminated soil less than 3mm for 36 hours, add 1%-3% The semi-charred bacterial fertilizer is mixed evenly, and sprayed into the biomass pyrolysis oil for granulation, wrapping and blocking the exudation and ...

Embodiment 3

[0024]Example 3, the first step, for cadmium-contaminated farmland, spray biomass pyrolysis oil according to the cadmium ratio of 10:1, grind and mix by rotary tiller, strengthen in-situ reduction reaction and fixed complexation, and improve the biomass pyrolysis oil. The utilization rate and the reduction and fixation rate of cadmium ions (>96%) eliminate dust, reduce the ratio of agent to soil and repair costs; in the second step, after 1 day, sprinkle 1%-3% semi-coke fertilizer on the surface of the farmland , crushed and mixed evenly by a rotary tiller, continuously producing active humic acid to ensure that the water-stable aggregates of the farmland soil are not damaged, to ensure that the cadmium detection standard in the treated soil is up to standard, to achieve continuous reduction and fixation, to restore the soil planting function, and to achieve safe and low-cost. Permanent and sustainable green in-situ restoration.

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Abstract

The invention discloses a heavy metal contaminated soil humic acid green in-situ curing repair technology. The technology comprises the steps that 1, when heavy metal contaminated soil is smashed, humic acid is added for in-situ reduction and curing, wherein the ratio of the humic acid to heavy metal is 5-30:1, and humic acid promotes soil granulated wrapping to prevent exudation and migration ofheavy metal in granules; and 2, after 24h of aging, 1%-3% of semi-cock bacterial manure is added into the reduced heavy metal contaminated soil to be mixed evenly, permanent reduction and fixing are achieved, and a soil planting function is achieved.

Description

1. Technical field [0001] The humic acid green in-situ solidification restoration process for heavy metal-contaminated soil provided by the invention relates to the purification and treatment of heavy metal-contaminated 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00B09C1/10
Inventor 田原宇乔英云谢克昌杨朝合
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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