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A method for remediation of heavy metal pollution in acidic soil

A repair method, acidic soil technology, applied in the restoration of contaminated soil, etc., can solve the problems of unsustainable repair effect, high cost, heavy repair workload, etc., and achieve the effect of reducing migration and bioavailability

Active Publication Date: 2020-03-27
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It strips heavy metal ions from the surface of basic soil particles, enriches them, removes them or immobilizes them. However, on the whole, these methods have problems such as heavy repair work, high cost, and unsustainable repair effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Dissolve ethyl orthosilicate in aqueous ethanol solution and stir for 5 minutes to form a repair reagent. The mass ratio of ethyl orthosilicate to ethanol is 1:5, and the mass ratio of ethanol to water is 1:5;

[0033] 2. Evenly mix the restoration reagent with the acidic soil (according to the solid-to-liquid ratio of 1:1, the acidic soil is dispersed in ultrapure water, and the measured pH is 5.3), so that the restoration reagent can fully contact with the basic particles of the soil, among which the restoration reagent The mass ratio to soil is 1:50;

[0034] 3. Mix the sodium hydroxide solution with a pH of 8.5 and the soil treated with the remediation reagent evenly, so that the sodium hydroxide solution can fully contact with the remediation reagent and complete the remediation of heavy metal pollution, wherein the mass ratio of the sodium hydroxide solution to the soil is 1 :50;

[0035] The results showed that the total Cd content in the repaired soil was th...

Embodiment 2

[0039] 1. Dissolve tetramethoxysilane in aqueous ether solution and stir for 20 minutes to form a repair reagent. The mass ratio of tetramethoxysilane to water is 1:5, and the mass ratio of ether to water is 1:20;

[0040] 2. Evenly mix the restoration reagent with the acidic soil (according to the solid-to-liquid ratio of 1:1, the acidic soil is dispersed in ultrapure water, and the measured pH is 5.3), so that the restoration reagent can fully contact with the basic particles of the soil, among which the restoration reagent The mass ratio to soil is 1:50;

[0041] 3. Evenly mix the potassium hydroxide solution with a pH of 8.3 and the soil treated with the remediation reagent to fully contact the potassium hydroxide solution with the remediation reagent and complete the remediation of heavy metal pollution, wherein the mass ratio of potassium hydroxide solution to soil is 1 :50;

[0042] The results showed that the total Cd content in the repaired soil was consistent with t...

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PUM

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Abstract

The invention discloses a remediation method for heavy metal pollution of acid soil. The remediation method comprises the steps of dissolving a siloxane substance of which the structural formula is Si(OR)4 into an aqueous solution of alcohol or ether as a remediation reagent; mixing the mixture of the siloxane substance and the aqueous solution of alcohol or ether with acid soil for reaction; and then, adding an aqueous solution of inorganic strong base or inorganic weak base for further reaction, wherein the R refers to one or more of methyl, ethyl and propyl. The remediation method for heavy metal pollution of acid soil is low in cost, and simple, convenient and efficient to implement, and restored heavy metals can be stably maintained in soil for a long time.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution in soil, and in particular relates to a method for remediation of heavy metal pollution in acidic soil. Background technique [0002] On April 17, 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources jointly announced the "National Soil Pollution Survey Bulletin", which aroused widespread concern from all sectors of society on the state of soil pollution in my country. According to the survey bulletin, the total exceeding rate of polluted soil nationwide is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1% respectively. Judging from the distribution of pollution, soil pollution in the south is heavier than that in the north, and the soil heavy metals in the southwestern and central southern regions exceed the standard in a large range. Generally speaking, the national soil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 何曦尹涛
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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