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Restoration method for alkaline soil heavy metal pollution

A remediation method and heavy metal technology, applied in the restoration of polluted soil and other directions, can solve the problems of unsustainable remediation effect, heavy remediation workload and high cost, and achieve low cost, effective remediation method, reduced mobility and bioavailability. Effect

Active Publication Date: 2016-10-12
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

[0029] Repair includes the following steps:

[0030] 1. Dissolve ethyl orthosilicate in the nitric acid solution of ethanol and stir for 30 minutes to obtain a repair reagent, wherein the mass ratio of ethyl orthosilicate to ethanol is 1:5, and the mass ratio of ethanol to nitric acid is 1:5 , the mass ratio of nitric acid to water is 1:20;

[0031] 2. Evenly mix the restoration reagent with the alkaline soil (according to the solid-to-liquid ratio of 1:1, the alkaline soil is dispersed in ultrapure water, and the measured pH is 8.9), so that the restoration reagent is fully in contact with the basic particles of the soil, and the restoration The mass ratio of reagent to soil is 1:40;

[0032] 3. Evenly mix the lake water with a pH of 7 and the soil treated with the remediation reagent to fully contact the lake water with the remediation reagent and complete the remediation of heavy metal pollution. The mass ratio of lake water to soil is 1:30;

[0033] The results showed th...

Embodiment 2

[0037] 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;

[0038] 2. Evenly mix the restoration reagent with the alkaline soil (according to the solid-to-liquid ratio of 1:1, the alkaline soil is dispersed in ultrapure water, and the measured pH is 8.9), so that the restoration reagent is fully in contact with the basic particles of the soil, and the restoration The mass ratio of reagent to soil is 1:40;

[0039] 3. Evenly mix the lake water with a pH of 7 and the soil treated with the remediation reagent to fully contact the lake water with the remediation reagent and complete the remediation of heavy metal pollution. The mass ratio of lake water to soil is 1:50;

[0040] The results showed that the total Cd content in the repaired ...

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Abstract

The invention discloses a restoration method for alkaline soil heavy metal pollution. Siloxane substances with the structural formula of Si(OR)4 are dissolved in an alcohol or ether acid solution to serve as a restoration reagent and are mixed with alkaline soil to react; and then water is added for a further reaction, wherein R represents one or more of methyl, ethyl or propyl. The restoration method easily, conveniently and efficiently treats alkaline soil heavy metal pollution at low cost, and restored heavy metal can be steadily kept in soil for a long time.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution restoration, in particular to a method for restoration of alkaline soil heavy metal pollution. 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 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 soil environment is not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 何曦刘胜强
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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