Remediation agent for soil polluted by heavy metals and remediation method thereof

A technology of soil remediation agent and remediation method, applied in the field of heavy metal soil remediation agent and its remediation, can solve the problems of high cost, soil structure damage, nutrient element leaching, etc., and achieves reduction of leaching concentration, remediation of heavy metal pollution in soil, and remediation method. simple effect

Inactive Publication Date: 2016-09-21
安徽金联地矿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional remediation methods for soil heavy metal pollution, such as landfill, leaching, and electrochemical methods, require a large amount of e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A heavy metal soil restoration agent, the restoration agent comprises the following material components in parts by mass: 25.5 parts of attapulgite, 1.8 parts of polyamide fiber, 2.6 parts of sodium humate, 6.2 parts of metal chelating agent, and 2.5 parts of biochar , 13.5 parts of nano silicon dioxide, 4.5 parts of polyferric chloride, 3.5 parts of peat, 3.8 parts of calcium peroxide; the above-mentioned biochar is 200 mesh rice husk ash, and its carbon content is 65%.

[0021] This restorative is made by the following steps:

[0022] 1) Mix biochar, peat, and calcium peroxide and finely grind it into powder; activate attapulgite at 380°C for 15 minutes, and grind it to a particle size of 600nm;

[0023] 2) Add activated attapulgite powder and nano-silica to the mixed powder obtained above, place it in a high-pressure steam reactor, feed saturated steam, and react under the conditions of 200 ° C and 2 MPa to obtain an activated product;

[0024] 3) Lower the temperat...

Embodiment 2

[0027] A heavy metal soil restoration agent, the restoration agent comprises the following material components in parts by mass: 23.5 parts of attapulgite, 2.2 parts of polyamide fiber, 2.4 parts of sodium humate, 6.8 parts of metal chelating agent, and 1.5 parts of biochar , 15.5 parts of nano silicon dioxide, 3.5 parts of polyferric chloride, 4.5 parts of peat, 3.2 parts of calcium peroxide; the above-mentioned biochar is 400 mesh rice husk ash, and its carbon content is 40%.

[0028] This restorative is made by the following steps:

[0029] 1) Mix biochar, peat, and calcium peroxide and finely grind it into powder; activate the attapulgite at 420°C for 15 minutes, and grind it to a particle size of 500nm;

[0030] 2) Add activated attapulgite powder and nano-silica to the mixed powder obtained above, place it in a high-pressure steam reactor, feed saturated steam, and react under the conditions of 200 ° C and 2 MPa to obtain an activated product;

[0031] 3) Lower the temp...

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PUM

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Abstract

The invention discloses a remediation agent for soil polluted by heavy metals. The remediation agent comprises the following ingredients in parts by weight: 23.5-25.5 parts of attapulgite, 1.8-2.2 parts of polyamide, 2.4-2.6 parts of sodium humate, 6.2-6.8 parts of a metal chelating agent, 1.5-2.5 parts of biochar, 13.5-15.5 parts of nano-silicon dioxide, 3.5-4.5 parts of poly ferric chloride, 3.5-4.5 parts of peat and 3.2-3.8 parts of calcium peroxide. The invention further discloses a remediation method of the remediation agent for soil polluted by heavy metals. The remediation method includes the steps of placing the remediation agent in a nylon mesh bag with 15-25 meshes, burying the nylon mesh bag in soil with the depth of from 15-35 cm, and removing the bag from the soil after absorption and exchange. The remediation agent, which is obtained from the combination of attapulgite and various functional materials, applies to the remediation of soil polluted by heavy metals, has the advantage of simple and convenient remediation method, and is suitable for industrial production; heavy metals in the soil can be eliminated permanently through absorption and exchange; the purpose of remediation of the soil polluted by heavy metals is achieved; the leaching concentration, mobility and toxicity of heavy metals in soil are reduced.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, and relates to a heavy metal soil restoration agent and a restoration method thereof. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metal pollution in farmland soil is extremely harmful. Heavy metal pollution in soil will not only reduce crop yield and quality, but also enter the human body through the soil-plant system and the food chain, endangering human health and life safety. Soil heavy metal pollution has the characteristics of concealment, hazard lag, long-term nature, and bioaccumulation of heavy metals in the biological chain. These determine that if the understanding and treatment of soil heavy metal pollution are delayed, it will bring unpred...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08B09C2101/00
Inventor 秦月琴任飞孙忠伟明桂林吴海东王前张传琦牛杏杏王赞王代飞
Owner 安徽金联地矿科技有限公司
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