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Repair method for cadmium-contaminated soil

A technology of cadmium-contaminated soil and repair method, which is applied in the restoration of contaminated soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of complex collection and treatment of plants in the later period, long repair period, etc., and achieve the elimination of environmental pollution Risk, short repair period, and the effect of ensuring safe production

Inactive Publication Date: 2017-05-31
沃邦环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN 102513340 A discloses a method for remediating heavy metal cadmium-contaminated soil. Specifically, the joint remediation method of plants and microorganisms is used to treat cadmium-contaminated soil. The results show that the cadmium removal rate is 64.2%. Late plant collection and treatment process is complex and other deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the embodiment of the present invention, the method for remediating cadmium-contaminated soil includes the following steps:

[0023] 1) Apply 0.5 tons of organic fertilizer per acre of cadmium-contaminated soil, use a rotary tiller to turn into the cadmium-contaminated soil, spray water to maintain the humidity of the contaminated soil at 10%; leave it for 5 days to prepare pretreated soil.

[0024] 2) The conditioner for soil remediation and the pretreated soil are mixed for the first time according to a mass ratio of 1:3. During the mixing process, spray water to keep the moisture of the pretreated soil at 8% and the temperature of the pretreated soil at 18 ℃, 20 days later, add a soil remediation conditioner for the second mixing. The addition amount of the soil remediation conditioner is 5% of the pretreated soil mass. After mixing evenly, keep the moisture of the pretreated soil at 10%. The temperature of the pretreated soil is 25℃, and it can repair the soil contami...

Embodiment 2

[0027] In the embodiment of the present invention, the method for remediating cadmium-contaminated soil includes the following steps:

[0028] 1) Apply 2 tons of organic fertilizer per mu of cadmium-contaminated soil, use a rotary tiller to turn into the cadmium-contaminated soil, spray water to maintain the humidity of the contaminated soil at 50%; leave it for 30 days to prepare pretreated soil.

[0029] 2) Mix the conditioner for soil remediation with the pretreated soil at a mass ratio of 1:20 for the first time. Spray water during the mixing process to keep the moisture of the pretreated soil at 20% and the temperature of the pretreated soil at 35 ℃, 30 days later, add a soil remediation conditioner for the second mixing. The addition amount of the soil remediation conditioner is 30% of the pretreated soil mass. After mixing evenly, keep the moisture of the pretreated soil at 30%. The temperature of the pretreated soil is 35℃, and the soil contaminated by cadmium can be repair...

Embodiment 3

[0032] In the embodiment of the present invention, the method for remediating cadmium-contaminated soil includes the following steps:

[0033] 1) Apply 1 ton of organic fertilizer per mu of cadmium-contaminated soil, use a rotary tiller to turn into the cadmium-contaminated soil, spray water, and keep the humidity of the contaminated soil at 20%; leave it for 10 days to prepare pretreated soil.

[0034] 2) Mix the conditioner for soil remediation with the pretreated soil at a mass ratio of 1:5 for the first time, spray water during the mixing process, keep the moisture of the pretreated soil at 10%, and keep the temperature of the pretreated soil at 20 ℃, 22 days later, add another soil remediation conditioner for the second mixing. The addition amount of soil remediation conditioner is 10% of the pretreated soil mass. After mixing uniformly, keep the moisture of the pretreated soil at 15%. The temperature of the pretreated soil is 25°C, and the soil contaminated by cadmium can be ...

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PUM

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Abstract

The invention discloses a repair method for cadmium-contaminated soil. The repair method comprises the following steps: applying an organic fertilizer on per mu of the cadmium-contaminated soil to prepare pre-treated soil; carrying out primary mixing on a conditioner for soil repair and the pre-treated soil in a mass ratio of 1: (3 to 20), spraying water, adding the conditioner for soil repair again and carrying out secondary mixing after 20 to 30 days, uniformly mixing and then using the product for repairing the cadmium-contaminated soil after 10 to 50 days, wherein the conditioner for soil repair comprises wollastonite, biogas residue, selenium nitrate, sodium aluminium carbonate hydroxide, barium phosphate, polydimethylsiloxane divalent quaternary ammonium salt, sugarcane ash, bamboo powder, methylisothiazolinone, sodium germanate, barium metaborate, (trimethylsilicyl) phosphate, trithiocyanuric acid and poly(3,4-ethylenedioxythiophene). The removal rate of cadmium ions of the soil repaired by the method disclosed by the invention is higher than 84%, and the method has a good repair effect on the soil and a short repair period; and moreover, the environmental quality of the repaired soil completely meets the secondary standard requirements of 'Soil Environment Quality Standard' (GB15618-1995) of China.

Description

Technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating soil contaminated by cadmium. Background technique [0002] The heavy metals polluting the soil mainly include elements with significant biological toxicity such as mercury, cadmium, lead, chromium, and metal-like arsenic. These heavy metals mainly come from industrial and mining waste residues, wastewater, sludge, pesticides, and soot atmospheric deposition. Heavy metals cannot be decomposed by microorganisms. Heavy metals themselves have poor fluidity and are easy to enter through the food chain and accumulate in the human body, harming 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. In recent years, my country's soil cadmium pollution incidents have occurred frequently, such as the "cadmium rice" incident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40
Inventor 刘军亮莫日红姜在春莫日高彭美银莫清云
Owner 沃邦环保有限公司
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