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Heavy metal contaminated soil composite remediation agent and using method and application thereof

A technology for composite restoration and contaminated soil, which is applied in the field of contaminated soil restoration, can solve the problems of weakened alkaline soil treatment effect, unfavorable quantitative use of chemicals, and difficulty in determining specific effects, etc., to achieve long-term effectiveness, good restoration effect, and extended The effect of service life

Inactive Publication Date: 2019-09-20
深圳市南科大资产经营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105586044A discloses a compound passivator suitable for cadmium pollution in rice field soil, which is composed of chitosan, sodium bentonite, bone powder, lime, biochar, ZnO and nano-FeO as main raw materials, and its composition includes alkaline agents, Clay minerals, organic agents and other components can repair polluted soil through the combination of various agents, but the passivator has good applicability to acidic soil, but the treatment effect on alkaline soil is obviously weakened, and the scope of application is limited
CN 108085010A discloses a composite restoration agent for soil heavy metal pollution and its application, including sodium bentonite, bone meal, chitosan, oyster shell powder, graphene modified crop straw biochar, bio-organic fertilizer, sodium silicate , nano-FeO, nano-carbon tubes, and microbial agents. There are many types of materials in the restoration agent, and the ingredients in bio-organic fertilizers and microbial agents are complex, and it is difficult to determine their specific functions, which is not conducive to the quantitative use of agents.

Method used

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  • Heavy metal contaminated soil composite remediation agent and using method and application thereof
  • Heavy metal contaminated soil composite remediation agent and using method and application thereof
  • Heavy metal contaminated soil composite remediation agent and using method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a compound remediation agent for heavy metal-contaminated soil and its use method, wherein the heavy metal-contaminated soil is lead-cadmium compound-contaminated soil, according to "Determination of effective lead and cadmium in soil quality by atomic absorption method GB / T23739-2009" The method determined that the available cadmium content in the soil was 3.5 mg / kg, the available lead content was 740 mg / kg, and the pH was 8.43.

[0057] The composite restoration agent includes the following components in parts by weight: 6.5 parts of potassium dihydrogen phosphate, 5 parts of bone powder, 5 parts of ferrous sulfate, 1 part of sodium bentonite, and 1 part of peat.

[0058] Its use method includes: applying the compound repairing agent and fertilizer of the above formula into the heavy metal polluted soil, the usage amount of the compound repairing agent is 2wt% of the soil mass, making it uniformly mixed with the soil by tilling, tilling The de...

Embodiment 2

[0062] This embodiment provides a compound remediation agent for heavy metal-contaminated soil and its application method, wherein the heavy metal-contaminated soil is lead-cadmium compound-contaminated soil, and the method in Example 1 is used to measure the effective cadmium content in the soil to be 3.575mg / kg , the effective lead content is 1601.25mg / kg, and the pH is 5.53.

[0063] The composite restoration agent includes the following components in parts by weight: 10 parts of potassium dihydrogen phosphate, 90 parts of bone powder, 5 parts of sodium bentonite, and 5 parts of plant ash.

[0064] Its use method comprises: applying the above-mentioned composite restoration agent into the heavy metal-contaminated soil, the usage amount of the composite restoration agent is 1.5wt% of the soil quality, and it is uniformly mixed with the soil by plowing, and the plowing depth is 30cm, the number of plowing times is 5 times, water is added to make the soil moisture content 35%,...

Embodiment 3

[0068] This embodiment provides a compound remediation agent for heavy metal-contaminated soil and its application method, wherein the heavy metal-contaminated soil to be remediated is the same as that in Embodiment 1.

[0069] The composite restoration agent includes the following components in parts by weight: 80 parts of ammonium dihydrogen phosphate, 20 parts of bone powder, 40 parts of oxalic acid, 3 parts of sodium bentonite, and 3 parts of rice husk charcoal.

[0070] Its use method includes: applying the composite restoration agent of the above formula into the heavy metal-contaminated soil, the usage amount of the composite restoration agent is 0.58wt% of the soil mass, and it is uniformly mixed with the soil by plowing, and the plowing depth is 20cm, the number of plowing times is 4 times, add water to make the soil moisture content 40%, maintain for 20 days, add water during the maintenance to keep the soil moist.

[0071] After curing, the content of available lead...

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Abstract

The invention provides a heavy metal contaminated soil composite remediation agent and a using method and an application thereof. The composite remediation agent comprises the following components, by weight: 5-100 parts of inorganic phosphate, 5-100 parts of bone meal, 1-5 parts of bentonite, and 1-5 parts of biochar. The composite remediation agent of the invention is dominated by phosphorus-containing components, has a good remediation effect on heavy metal composite contaminated soil through the synergistic action of inorganic phosphorus and organic phosphorus and the stabilization of other components, and can greatly reduce available cadmium and lead in soil. For different types of contaminated soil, the dosage and composition ratio of the agent are adjusted and an application range of the composite remediation agent is expanded according to the pH and heavy metal content of the soil. The composite remediation agent has the advantages of low cost, environmental protection, convenient use and small impact on soil properties.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and relates to a compound remediation agent for heavy metal polluted soil and its application method and application. Background technique [0002] With the continuous development of modern agriculture, the problem of soil pollution is becoming more and more serious. Among them, heavy metals are more stable in soil than other pollutants, and are not easy to transform and be used by microorganisms, forming the characteristics of accumulation in soil. However, heavy metals exist in different forms in In the soil, the available heavy metals can be absorbed by plants and enriched in the human body through the food chain. When the accumulation reaches a certain level, it will seriously threaten human health. Therefore, how to take effective measures to remediate farmland polluted soil and reduce the accumulation of heavy metals in agricultural products, so as to ensure food safety...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C2101/00
Inventor 丁苏苏石丕星朱焰黄珏瑛林斯杰
Owner 深圳市南科大资产经营管理有限公司
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