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A kind of remediation agent and application for treating cadmium polluted soil

A technology for cadmium-contaminated soil and a remediation agent, applied in the field of soil pollution remediation, can solve the problems of low remediation efficiency and high treatment cost, and achieve the effects of improving physical properties, reducing reducing dose, and good water solubility

Active Publication Date: 2018-08-31
博川环境修复(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally problems such as low repair efficiency and high processing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Grind the following raw materials into materials with a particle size not less than 200 mesh, and weigh them according to the mass percentage:

[0036] Polyacrylamide 5%;

[0037] Sodium thiosulfate 3.5%;

[0038] Ferrous sulfate 1.5%;

[0039] Chitosan 5%;

[0040] Sodium lignosulfonate 5%;

[0041] Calcium Oxide 75%;

[0042] Plant ash 5%;

[0043] Then mix evenly to obtain the repairing agent.

Embodiment 2

[0045] Grind the following raw materials into materials with a particle size not less than 200 mesh, and weigh them according to the mass percentage:

[0046] Polyacrylamide 10%;

[0047] Sodium thiosulfate 7%;

[0048] Ferrous sulfate 3%;

[0049] Chitosan 10%;

[0050] Sodium lignosulfonate 10%;

[0051] Calcium Oxide 50%;

[0052] Plant ash 10%;

[0053] Then mix evenly to obtain the repairing agent.

Embodiment 3

[0055] Grind the following raw materials into materials with a particle size not less than 200 mesh, and weigh them according to the mass percentage:

[0056] Polyacrylamide 5%;

[0057] Sodium thiosulfate 14%;

[0058] Ferrous sulfate 6%;

[0059] Chitosan 5%;

[0060] Sodium lignosulfonate 5%;

[0061] Calcium Oxide 60%;

[0062] Plant ash 5%;

[0063] Then mix evenly to obtain the repairing agent.

[0064] Examples of application of repairing agents

[0065] 100 kg of cadmium-contaminated soil was taken from a farmland in Hengyang, Hunan.

[0066] (1) The content of cadmium in soil samples was determined by the detection method specified in "Determination of Available Lead and Cadmium in Soil Quality by Atomic Absorption Method" (GB / T 23739-2009), and the content of available cadmium was 45mg / kg.

[0067] (2) According to the test result, 2 kilograms of the repairing agent provided in the embodiment 1 in the repairing agent, the repairing agent is evenly spread on t...

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Abstract

The invention provides a repairing agent used for governing cadmium-contaminated soil. The repairing agent comprises, by weight ratio, 5-10% of polyacrylamide, 5-20% of a reducing agent, 5-10% of chitosan, 5-10% of sodium lignin sulfonate, 50-75% of calcium oxide and 5-10% of plant ash. The reducing agent is a mixture prepared through sodium thiosulfate and ferrous sulfate according to the mass ratio of 7:3. Materials with the particle size not smaller than 200 meshes are ground and are evenly mixed according to the above proportion to form the repairing agent. The prepared soil repairing agent has good effects in repairing cadmium-contaminated soil and has the beneficial effects of being simple in preparing method, feasible and good in governing effect.

Description

Technical field: [0001] The invention relates to the technical field of soil pollution remediation, in particular to a remediation agent for treating cadmium-contaminated soil and its application. technical background: [0002] Soil heavy metal pollution has gradually become the focus of public attention. [0003] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the quality of the soil environment of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. . Man-made activities such as industry, mining, agriculture, and high background values ​​of the soil environment are the main causes of soil pollution or exceeding standards. The total exceeding rate of national soil is 16.1%, of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40
Inventor 周益辉
Owner 博川环境修复(北京)有限公司
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