Stabilization repairing agent for soil pollution and preparation and application

A soil pollution and remediation agent technology, which is applied in the field of stable remediation of contaminated soil, can solve the problems of soil reduction, high price, secondary pollution, etc., and achieve the effect of wide material sources, simple application methods, and no secondary pollution

Active Publication Date: 2019-11-08
森特土壌修復研究院(深せん)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems exist in the existing restoration agents: 1) The agent itself pollutes the environment
For example, the background value of some heavy metals in general mineral materials is high. Although it can effectively repair the characteristic target pollutants, it often introduces new pollutants or promotes the release of other heavy metals in the soil, resulting in secondary pollution; sulfur-based substances are generally It has a pungent smell or is corrosive, which is a great hazard to the health of the on-site personnel.
2) Compound pollution of various heavy metals is common, and the compatibility of existing stabilized restoration materials on the market is poor
For example: phosphate materials have a good effect on repairing lead-contaminated soil, but the introduction of phosphate often promotes the release of arsenic in the soil, and even causes the arsenic in the treated soil leachate to

Method used

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  • Stabilization repairing agent for soil pollution and preparation and application
  • Stabilization repairing agent for soil pollution and preparation and application
  • Stabilization repairing agent for soil pollution and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of modified humic acid

[0041] S1: Under the condition of 26°C, mix humic acid and 1mol / L HCl according to the mass-volume ratio of 0.1g / mL for 24 hours, and then centrifuge to remove the supernatant after standing still to obtain primary-washed humic acid.

[0042] S2: Under the condition of 26°C, use 0.1mol / L HCl to wash the initial washing humic acid again, mix the initial washing humic acid and 0.1mol / L HCl according to the mass volume ratio of 0.1g / mL, and the mixing reaction time is 5min , remove the supernatant to obtain the secondary HCl pickling humic acid.

[0043] S3: Mix 1 mol / L HCl and 20 mol / L HF according to the volume ratio of 1:1 to obtain HCl / HF mixed solution; the secondary HCl pickling humic acid and HCl / HF mixed solution obtained in S2 are mixed according to the mass Mix with a volume ratio of 0.5g / mL to decompose the residual inorganic matter in the humic acid pickling with HCl twice, the temperature condition is 60°C, the reactio...

Embodiment 2

[0052] (1) Preparation of modified humic acid

[0053] S1: Mix humic acid and 2mol / L HCl at a mass-volume ratio of 0.125g / mL at 30°C, react for 20 hours, and centrifuge to remove the supernatant after standing still to obtain primary-washed humic acid.

[0054] S2: Under the condition of reaction temperature of 20°C, use 0.2mol / L HCl to wash the initial washing humic acid again, mix the initial washing humic acid and 0.2mol / L HCl according to the mass volume ratio of 0.125g / mL, and mix the reaction The time is 10 minutes, and the supernatant is removed to obtain the secondary HCl pickling humic acid.

[0055] S3: Mix 2mol / L HCl and 10mol / L HF according to the volume ratio of 1:1 to obtain the HCl / HF mixture; the secondary HCl pickling humic acid and HCl / HF mixture obtained in S2 are mixed according to the mass Mix with a volume ratio of 0.25g / mL to decompose the residual inorganic substances in the secondary HCl pickling humic acid. The temperature condition is 65°C and the r...

Embodiment 3

[0064] (1) Preparation of modified humic acid

[0065] S1: At 20°C, mix humic acid and 1.5 mol / L HCl at a mass volume ratio of 0.083 g / mL, mix and react for 30 hours, and centrifuge to remove the supernatant after standing still to obtain primary-washed humic acid.

[0066] S2: Under the condition of reaction temperature of 30°C, use 0.15mol / L HCl to wash the initial washing humic acid again, mix the initial washing humic acid and 0.15mol / L HCl according to the mass volume ratio of 0.083g / mL, and mix the reaction The time is 2 minutes, and the supernatant is removed to obtain humic acid washed with HCl twice.

[0067] S3: Mix 1.5mol / L HCl and 15mol / L HF according to the volume ratio of 1:2 to obtain the HCl / HF mixed solution; the secondary HCl pickling humic acid and HCl / HF mixed solution obtained in S2, according to The mass volume ratio is 0.33g / mL, and the residual inorganic substances in the humic acid pickling are decomposed twice. The temperature condition is 50°C, and ...

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PUM

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Abstract

The invention provides a stabilization repairing agent for soil pollution, wherein the agent includes components such as quicklime, potassium dihydrogen phosphate, phosphate rock powder and demineralized and modified humic acid, and is prepared from, by mass, combination of the components. After the stabilization repairing agent is applied to soil contaminated by lead and cadmium and is subjectedto stabilized treatment and maintenance for one week, the concentration of lead and cadmium in a leach liquor of the soil can meet standards of groundwater quality class IV. The mixed component in thestabilization repairing agent of the invention fully exerts a synergistic effect, the effective state of heavy metals in the soil can be reduced by the action of precipitation, adsorption, improvement, pH adjustment, and the like, and the prepared soil repairing agent has good effects in repairing lead and cadmium contaminated soil. The stabilization repairing agent for the soil pollution has theadvantages of simple preparation method, feasibility and good treatment effect.

Description

technical field [0001] The invention belongs to the technical field of stable restoration of polluted soil, and in particular relates to a stable restoration agent for soil pollution and its preparation and application. Background technique [0002] With the rapid development of modern industry and agriculture, the situation of heavy metal pollution in soil is becoming more and more severe. my country's heavy metal pollution incidents are entering a period of high incidence. Among many polluted sites, heavy metal pollution is a prominent problem. In 2014, the National Soil Pollution Survey Bulletin released by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the point-exceeding rates of cadmium, mercury, arsenic, copper, lead, chromium, zinc, and nickel were 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, 4.8%. Among them, the rate of excessive farmland soil points in my country is 19.4%, and heavy metal pollution such as Cd, Ni, and Cu is...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 韩伟李彦希
Owner 森特土壌修復研究院(深せん)有限公司
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