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Soil composite repair agent and applications of soil composite repair agent in removal of heavy metals from soil

A composite remediation and soil technology, applied in the restoration, application and soil conditioning materials of polluted soil, can solve the problems of loss of nutrients, low remediation efficiency, soil structure damage, etc., to reduce the degree of toxicity, prevent environmental migration and the effect of diffusion

Inactive Publication Date: 2017-03-08
ZHEJIANG AVOCADO ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment methods for soil heavy metal pollution mainly include immobilization / stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation. There are generally problems such as low remediation efficiency and high treatment costs.
Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0018] (a) Take samples from the soil and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the Solid Waste "Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0019] (b) Preparation of soil composite restoration agent Configure the restoration agent according to the following raw material mass percentages:

[0020] 60% polylactic acid, 15% polycaprolactone, 15% protein powder, 5% ethylenediaminetetraacetic acid, 4.5% glycerin, 0.5% bis-diamine salicylate; mix the prepared repair agent at low speed Stir in the machine for 5 minutes; add the uniformly ...

Embodiment 2

[0027] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0028] (a) Take samples from the soil and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the Solid Waste "Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0029] (b) Preparation of soil composite restoration agent Configure the restoration agent according to the following raw material mass percentages:

[0030] 60% polybutylene succinate, 20% polylactic acid, 13.5% sodium citrate, 5% citrate, 1% laurate, 0.5% diamine diamine salicylate; The agent is placed in a low-speed mixer and stirred for 5 minutes; the evenly stirred material is added to a g...

Embodiment 3

[0037] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0038] (a) Take a sample from the soil and detect the soil heavy metal concentration before remediation by using an overturning oscillator to perform a leaching test on the soil according to the Solid Waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0039] (b) Preparation of soil composite restoration agent Configure the restoration agent according to the following raw material mass percentages:

[0040] 30% polylactic acid, 25% cellulose, 25% lignin, 11% beef extract, 6.5% glycerin, 2% oleamide, 0.5% bis-salicylidene diamine; put the prepared repair agent in a low-temperature grinder Grind for 10 minutes; make the restorative agent into powder, and th...

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Abstract

The present invention discloses a soil composite repair agent, which contains a biodegradable macromolecule material, a filler, a plasticizer, a lubricant and an antioxidant. According to the present invention, the soil composite repair agent can efficiently activate the beneficial indigenous microorganisms in the soil, and the microorganisms can provide effects of adsorption, precipitation, oxidation-reduction, and the like for heavy metals, such that the toxicity of heavy metals in the contaminated soil can be reduced; and the microorganisms can react with the heavy metals in the soil to make the heavy metals form the stable chemical forms, such that the environmental migration and diffusion of the heavy metals can be prevented, and the poisoning degree of the heavy metals in the environment can be reduced.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a novel soil composite restoration agent and its application in removing heavy metals in soil. Background technique [0002] With the rapid development of industrialization and urbanization, soil heavy metal pollution has become a prominent environmental problem that cannot be ignored. The area of ​​cultivated land polluted by Cd, As, Pb, Hg, Zn and other heavy metals in my country is nearly 20 million hm 2 , accounting for about one-fifth of the total arable land area. There are two types of soil heavy metal pollution, man-made and natural. Human activities are the main cause of soil heavy metal pollution. The natural sources of soil heavy metal pollution are mainly natural geological activities such as rock weathering and volcanic eruptions. Irrigation, pesticide and fertilizer application, atmospheric deposition, etc. Heavy metal pollution can cause cancer, disease,...

Claims

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Application Information

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IPC IPC(8): C09K17/18C09K17/32B09C1/08B09C1/10C09K101/00
CPCB09C1/08B09C1/10B09C1/105C09K17/18C09K17/32C09K2101/00
Inventor 钟路华陈慧
Owner ZHEJIANG AVOCADO ENVIRONMENTAL PROTECTION TECH CO LTD
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