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A remediation method for neutral soil heavy metal pollution

A remediation method and soil technology, applied in the restoration of polluted soil and other directions, can solve the problems of high cost, unsustainable remediation effect, large remediation workload, etc., and achieve the effects of low cost, reduced mobility 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] Repair includes the following steps:

[0033] 1. Ethyl orthosilicate is dissolved in the nitric acid solution of ethanol and stirred for 30min to obtain repair reagent, wherein the mass ratio of ethyl orthosilicate to ethanol is 1:5, and the mass ratio of ethanol to nitric acid solution is 1: 5. The mass ratio of nitric acid to water is 1:20;

[0034] 2. Evenly mix the restoration reagent with neutral soil (the neutral soil is dispersed in ultrapure water at a solid-to-liquid ratio of 1:1, and the measured pH is 7.0), so that the restoration reagent can fully contact the basic particles of the soil, among which The mass ratio of restoration reagent to soil is 1:40;

[0035] 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 s...

Embodiment 2

[0040] 1. Dissolve tetramethoxysilane in the hydrochloric acid solution of ether and stir for 60 minutes to form a repair reagent. The mass ratio of tetramethoxysilane to ether is 1:5, and the mass ratio of ether to hydrochloric acid solution is 1:5. Hydrochloric acid The mass ratio with water is 1:20;

[0041] 2. Evenly mix the restoration reagent with neutral soil (the neutral soil is dispersed in ultrapure water at a solid-to-liquid ratio of 1:1, and the measured pH is 7.0), so that the restoration reagent can fully contact the basic particles of the soil, among which The mass ratio of restoration reagent to soil is 1:40;

[0042] 3. Evenly mix the potassium hydroxide solution with a pH of 8.5 and the soil treated with the remediation reagent, so that the potassium hydroxide solution can fully contact 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;

[0043] The res...

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PUM

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Abstract

The invention discloses a remediation method for heavy metal pollution of neutral soil. The remediation method comprises the steps of dissolving a siloxane substance of which the structural formula is Si(OR)4 into an acid solution of alcohol or ether as a remediation reagent; mixing the mixture of the siloxane substance and the acid solution of alcohol or ether with neutral 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 neutral 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 neutral soil heavy metal pollution. [0002] technical background [0003] 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 over-standard rate of soil in the country 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 ...

Claims

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Application Information

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