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Agent and method used for remedying heavy metal polluted soil

A technology of polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of high operating cost, high economic cost, and few application research examples, and achieve the effect of short remediation period and good remediation effect

Inactive Publication Date: 2013-11-20
CHONGQING YUANCHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is difficult to implement in China due to the small distance of current action and the actual polluted soil area is large, and its high operating cost is unbearable
The disadvantages of this method are: 1. It can only be used to treat volatile heavy metals (such as

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Excavate and transport heavy metal-contaminated soil to a special site for soil remediation;

[0034] 2. Mix bentonite, magnesium sulfate, ferrous sulfide, lime, and ferrous sulfate in a weight ratio of 40:2:3:4:3 to prepare a special heavy metal restoration agent;

[0035] 3. Use a forklift to send the contaminated soil into the hopper of the crusher. After crushing, it is conveyed to the mixer by the belt. At the same time, it is mixed according to the weight ratio of soil: repair agent = 20:1, and then conveyed to the stacking place by the conveyor belt to obtain Soil after dosing;

[0036] 4. After 3 months, the heavy metals in the heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, thereby realizing the restoration of heavy metals. The quality of the soil environment after restoration meets China's "Soil Environmental Quality Standards" (GB15618 -1995) secondary standard requirements.

Embodiment 2

[0038] 1. Excavate and transport heavy metal-contaminated soil to a special site for soil remediation;

[0039] 2. Bentonite, magnesia, ferrous sulfide, lime, and ferrous sulfate are mixed evenly in a weight ratio of 45:7:5:5:3 to prepare a special heavy metal repair agent;

[0040] 3. Use a forklift to send the contaminated soil into the hopper of the crusher. After crushing, it is conveyed to the mixer by the belt. At the same time, it is mixed according to the weight ratio of soil: repair agent = 15:1, and then conveyed to the stacking place by the conveyor belt to obtain Soil after dosing;

[0041] 4. After 4 months, the heavy metals in the heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, thereby realizing the restoration of heavy metals. The quality of the soil environment after restoration meets China's "Soil Environmental Quality Standards" (GB15618 -1995) secondary standard requirements.

Embodiment 3

[0043] 1. Excavate and transport heavy metal-contaminated soil to a special site for soil remediation;

[0044] 2. Mix bentonite, magnesium chloride, ferrous sulfide, lime, and ferrous sulfate in a weight ratio of 48:7:5:6:4 to prepare a special heavy metal restoration agent;

[0045] 3. Use a forklift to send the contaminated soil into the hopper of the crusher. After crushing, it is conveyed to the mixer by a belt. At the same time, it is mixed according to the weight ratio of soil: repair agent = 10:1, and then conveyed to the stacking place by a conveyor belt to obtain Soil after dosing;

[0046]4. After 6 months, the heavy metals in the heavy metal-contaminated soil were reduced to low-priced immobilized heavy metals, which lost their bioavailability, thereby realizing the restoration of heavy metals. The quality of the soil environment after restoration meets China's "Soil Environmental Quality Standards" (GB15618 -1995) secondary standard requirements.

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Abstract

The invention discloses an agent used for remedying heavy metal polluted soil. The agent is prepared by mixing bentonite, a preparation containing magnesium, ferrous sulfide, lime and ferrous sulphate at a weight ratio of 40-50:1-10:1-10:4-7:1-5. The invention also provides a method used for remedying heavy metal polluted soil by using the agent. Advantages of applications of the agent and the method in remediation of heavy metal polluted soil are that, remediation effect is excellent, remediation period is short, soil environment quality after remediation meets the secondary standards of China <soil environmental quality standard> (GB15618-1995) completely, and the like.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a remediation agent and a remediation method for heavy metal polluted soil. Background technique [0002] In the process of urbanization and industrialization, the problem of environmental pollution is becoming more and more serious, and major social incidents caused by it are not uncommon. Among them, the problem of heavy metal pollution deserves our attention, such as the chromium pollution incident in Qujing, Yunnan, and the cadmium pollution incident in Longjiang, Guangxi. highly anticipated. Heavy metal pollution has become a major social problem in recent years, posing a threat to my country's environmental safety and agricultural product safety. What's more serious is that soil heavy metal pollution has the characteristics of long-term and hysteresis, and can enter the food chain through various channels to accumulate and amplify, seriously affecting human health and ...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
Inventor 王俊川陈刚姜军梁发明
Owner CHONGQING YUANCHUAN ENVIRONMENTAL PROTECTION TECH
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