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Repairing method for cadmium and zinc heavy metal contaminated soil

A technology of polluted soil and remediation method is applied in the field of remediation of cadmium and zinc heavy metal polluted soil, which can solve the problem that the cadmium and zinc heavy metal polluted soil needs to be further improved, and achieve the effect of good removal effect and good removal efficiency.

Active Publication Date: 2016-05-18
JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages, and the remediation effect on cadmium and zinc heavy metal contaminated soil needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of restoration method of cadmium zinc heavy metal polluted soil, this method comprises the following steps:

[0022] (1) Preparation of restoration agent: Parts by weight are: 10 parts of zeolite powder, 8 parts of fly ash, 5 parts of zinc oxide, 6 parts of sodium silicate, 3 parts of hydroxyapatite, 7 parts of sugarcane ash, chicken Mix 6 parts of feces, 3 parts of selenium oxide, 5 parts of cyclodextrin, 4 parts of nano-nickel powder, 3 parts of potassium citrate and 4 parts of Portland cement, and put them in a ball mill tank to grind to a fineness of 100 mesh;

[0023] (2) Spread the contaminated soil on a flat plate, then take 1 / 3 of the total weight of the above repair agent and sprinkle it on the contaminated soil, plow up and down, spray water, and keep the humidity of the contaminated soil at 10%; wherein, the At least one layer of fiber membrane is provided between the flat plate and the polluted soil in step (2);

[0024] (3) Take 1 / 3 of the total wei...

Embodiment 2

[0028] A method for repairing cadmium-zinc heavy metal contaminated soil, characterized in that the method comprises the following steps:

[0029] (1) Preparation of restoration agent: Parts by weight are: 12 parts of zeolite powder, 10 parts of fly ash, 7 parts of zinc oxide, 8 parts of sodium silicate, 5 parts of hydroxyapatite, 11 parts of sugarcane ash, chicken 9 parts of feces, 6 parts of selenium oxide, 8 parts of cyclodextrin, 7 parts of nano-nickel powder, 6 parts of potassium citrate and 5 parts of Portland cement are mixed, and then placed in a ball mill tank for grinding to a fineness of 180 mesh;

[0030] (2) Spread the contaminated soil on a flat plate, then take 1 / 3 of the total weight of the above repair agent and sprinkle it on the contaminated soil, plow up and down, spray water, and keep the humidity of the contaminated soil at 12%; wherein, the At least one layer of fiber membrane is provided between the flat plate and the polluted soil in step (2);

[0031...

Embodiment 3

[0035] A kind of restoration method of cadmium zinc heavy metal polluted soil, this method comprises the following steps:

[0036] (1) Preparation of restoration agent: Parts by weight are: 13 parts of zeolite powder, 12 parts of fly ash, 8 parts of zinc oxide, 10 parts of sodium silicate, 6 parts of hydroxyapatite, 12 parts of sugarcane ash, chicken After mixing 10 parts of manure, 8 parts of selenium oxide, 8 parts of cyclodextrin, 8 parts of nano-nickel powder, 6 parts of potassium citrate and 6 parts of Portland cement, put it in a ball mill tank and grind it to a fineness of 170 mesh;

[0037] (2) Spread the contaminated soil on a flat plate, then take 1 / 3 of the total weight of the above repair agent and sprinkle it on the contaminated soil, plow up and down, spray water, and keep the humidity of the contaminated soil at 13%; wherein, the At least one layer of fiber membrane is provided between the flat plate and the polluted soil in step (2);

[0038] (3) Take 1 / 3 of t...

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PUM

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Abstract

The invention discloses a repairing method for cadmium and zinc heavy metal contaminated soil. The method includes the following steps that firstly, a repairing agent is prepared, wherein zeolite powder, coal ash, zinc oxide, sodium silicate, hydroxyapatite, sugarcane ash, fowl manure, selenium oxide, cyclodextrin, nano-nickel powder, potassium citrate and portland cement are mixed and then ground; secondly, the contaminated soil is flatly laid on a plate, one third of the total weight of the repairing agent is scattered on the contaminated soil, vertical ploughing is conducted, and water is sprayed; thirdly, one third of the total weight of the repairing agent is scattered on the contaminated soil, vertical ploughing is conducted, a phosphoric acid aqueous solution is sprayed, and ploughing is conducted after standing; fourthly, the rest of the repairing agent is scattered on the contaminated soil; and fifthly, the upper surface of the contaminated soil is covered with a layer of protection film finally for repairing. After the repairing method is used for repairing for 10 hours, the removing rate of cadmium ions in the soil is higher than 89.3%, the removing rate of zinc ions is higher than 90.5%, and high removing efficiency and a good removing effect are shown.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a method for remediating soil polluted by cadmium and zinc heavy metals. Background technique [0002] Heavy metals in polluted soil mainly include mercury, cadmium, lead, chromium and metalloid arsenic and other elements with significant biological toxicity. Heavy metals cannot be decomposed by microorganisms. Heavy metals themselves have poor mobility and can easily enter and accumulate in the human body through the food chain, endangering human health. In addition, heavy metals may also be transformed into substances that are more harmful to the human body and bring greater harm. [0003] my country's cadmium pollution is serious, involving a wide range, followed by zinc, mercury and other heavy metal pollution. At present, there are physical methods, chemical methods and bioengineering methods for remediation of heavy metal-contaminated soils, including: guest soi...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40
Inventor 程功弼仲英豪
Owner JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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