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Heavy metal contaminated soil remediation agent and remediation method

A technology of polluted soil and remediation agent, which is applied in the field of soil remediation and can solve problems such as perishable, invalid, and poor self-stability

Pending Publication Date: 2021-06-04
ZHEJIANG ZONE KING ENVIRONMENTAL SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are problems in the existing technology: the market stabilization agent is a purified or refined high-purity chemical drug, and the preparation cost is relatively high; the stabilization mechanism of the drug itself is single, generally only the role of precipitation of heavy metals; chemicals enter the environment After being affected by water, air and soil, it is easy to deteriorate and fail, and its own stability is poor

Method used

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  • Heavy metal contaminated soil remediation agent and remediation method
  • Heavy metal contaminated soil remediation agent and remediation method
  • Heavy metal contaminated soil remediation agent and remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Preparation of restoration agent

[0061] (1) Place the natural sepiolite mineral in a muffle furnace for calcination at 700°C for 4 hours, and grind the mineral after cooling to keep it in powder form.

[0062] (2) In terms of mass fraction, take 60 parts of the above-mentioned modified sepiolite, 20 parts of calcium dihydrogen phosphate, 10 parts of biochar, 5 parts of calcium oxide, and 5 parts of sodium carbonate, mix them physically and uniformly, and grind them through a 200-mesh sieve Made into a targeted fix.

[0063] 2. The use of restoratives

[0064] Take 2.5g of restoration agent and add it to 500g of cadmium-contaminated soil in a certain farmland (0.5% addition ratio), keep 30% moisture content, and carry out maintenance.

[0065] 3. Comparative example

[0066] Add 2.5g of natural sepiolite and calcium dihydrogen phosphate into 500g of cadmium-contaminated soil of the farmland respectively, and maintain 30% moisture content for maintenance.

[0067...

Embodiment 2

[0074] 1. Preparation of restoration agent

[0075] (1) Place the natural attapulgite powder in a muffle furnace and keep it calcined at 600°C for 3 hours. After cooling, grind the mineral to keep it in powder form.

[0076] (2) In terms of mass fraction, take 70 parts of the above-mentioned modified attapulgite powder, 10 parts of potassium dihydrogen phosphate, and 10 parts of humic acid, mix them physically and uniformly, and grind them through a 200-mesh sieve to make the target restoration agent.

[0077] 2. The use of restoratives

[0078] Take 15g of restoration agent and add it to 500g of copper-contaminated soil in a polluted site (3% addition ratio), keep 30% moisture content, and carry out maintenance.

[0079] 3. Comparative example

[0080] Take natural attapulgite powder and 15g of potassium dihydrogen phosphate respectively and add it to 500g of copper-contaminated soil of the polluted site to maintain a moisture content of 30% for maintenance.

[0081] 4. Im...

Embodiment 3

[0087] 1. Preparation of restoration agent

[0088] (1) Put the natural kaolin powder in a muffle furnace for calcination at 650°C for 6 hours, and grind the mineral after cooling to keep the powder.

[0089] (2) In terms of mass fraction, take 70 parts of the above-mentioned modified attapulgite powder, 10 parts of potassium dihydrogen phosphate, 10 parts of biochar, and 10 parts of calcium oxide for physical uniform mixing, and grind through a 200-mesh sieve to make the target restoration agent.

[0090] 2. The use of restoratives

[0091] Take 25g of restoration agent and add it to 500g copper, arsenic, zinc, lead contaminated soil of a polluted site (5% addition ratio), keep 40% moisture content, and maintain for 10 days.

[0092] 3. Comparative example

[0093] Take natural biotite powder and 25g of potassium dihydrogen phosphate and add them to 500g of copper, arsenic, zinc, and lead-contaminated soil of the polluted site, keep 40% moisture content, and maintain for 10...

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Abstract

The invention relates to a heavy metal contaminated soil remediation agent and remediation method, and belongs to the field of soil remediation. The heavy metal contaminated soil remediation agent is characterized by comprising the raw materials in parts by mass: 30-80 parts of natural minerals, 10-20 parts of a stabilizer, 0-20 parts of an organic material, 0-10 parts of a calcined material, 0-10 parts of a pH value regulator and 0-10 parts of a sodium auxiliary agent, A compounding method of the heavy metal contaminated soil remediation agent comprises the steps: grinding the raw materials, adding the ground raw materials in proportion, and physically mixing the ground raw materials; or after the auxiliary agent is further dissolved in water to modify calcined modified mineral, the modified mineral, the organic material, the pH value regulator and the auxiliary agent are uniformly and physically mixed and ground. According to the heavy metal contaminated soil remediation agent and remediation method, heavy metal contaminated soil such as Cu, Cd, Ni, Pb, As, Zn and hexavalent chromium is used, and the advantages that the stabilization effect is good, the maintenance process is simple and easy to implement, and the remediation cost is saved can be achieved.

Description

technical field [0001] The invention relates to a remediation agent and a remediation method for heavy metal polluted soil, belonging to the field of soil remediation. Background technique [0002] The "National Soil Pollution Survey Bulletin" (2014) shows that the overall situation of my country's soil environment is not optimistic. Some areas have serious soil pollution, the soil environment quality 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. [0003] The current heavy metal-contaminated soil remediation technology mainly starts from two perspectives: the reduction of the availability of heavy metals in the contaminated site soil or the reduction of the total amount of heavy metals. Among them, the stabilization and repair technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02
Inventor 田平王宇峰朱于红邹传杜耀卓未龙
Owner ZHEJIANG ZONE KING ENVIRONMENTAL SCI&TECH CO LTD
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