Soil remediation agent

The technology of a soil remediation agent and sodium-based bentonite is applied in the field of soil pollution remediation, which can solve the problems of soil structure damage, loss of nutrient elements, and high processing cost, and achieves the effects of high adsorption value, increased adsorption capacity, and avoidance of environmental pollution.

Inactive Publication Date: 2016-06-01
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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

[0035] The test soil was collected from an area contaminated by heavy metals. The content of heavy metals in the surface of the soil was higher than the third-level standard of "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0036] (a) Sampling from the soil, testing according to the solid waste "Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), using an overturning shaker to conduct a leaching test on the soil to detect the heavy metal concentration of the soil before restoration;

[0037] (b) Preparation of soil remediation agent: using a mixture of straw and calcium oxide as raw materials, the mass ratio of the straw and calcium oxide is 20:1, and the system pressure is 20kPa and the pyrolysis temperature is 500℃. Solve for 30 minutes and obtain biomass charcoal powder with a particle size of 3mm or less through grinding treatment; obtain sodium bentonite with an alkalinity coefficie...

Embodiment 2

[0050] The test soil was collected from an area contaminated by heavy metals. The content of heavy metals in the soil surface of this area was higher than the third-level standard of "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0051] (a) Sampling from the soil, testing according to the solid waste "Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), using an overturning shaker to conduct a leaching test on the soil to detect the concentration of heavy metals in the soil before restoration;

[0052] (b) Preparation of soil remediation agent: using a mixture of straw and calcium oxide as raw materials, the mass ratio of the straw and calcium oxide is 20:1, and the system pressure is 20kPa and the pyrolysis temperature is 500℃. Solve for 30 minutes and obtain biomass charcoal powder with a particle size of 3mm or less through grinding treatment; obtain sodium bentonite with an alkalinity...

Embodiment 3

[0065] The test soil was collected from an area contaminated by heavy metals. The content of heavy metals in the surface of the soil was higher than the third-level standard of "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0066] (a) Sampling from the soil, testing according to the solid waste "Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), using an overturning shaker to conduct a leaching test on the soil to detect the concentration of heavy metals in the soil before restoration;

[0067] (b) Preparation of soil remediation agent: using a mixture of straw and calcium oxide as raw materials, the mass ratio of the straw and calcium oxide is 20:1, and the system pressure is 20kPa and the pyrolysis temperature is 500℃. Solve for 30 minutes and obtain biomass charcoal powder with a particle size of 3mm or less through grinding treatment; obtain sodium bentonite with an alkalinity coeff...

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Abstract

The invention provides a soil remediation agent. The soil remediation agent is composed of, by weight, 10-25% of hydroxyl calcium phosphate, 30-45% of biomass charcoal, 10-15% of sodium sulfide, 10-15% of sodium bentonite and 10-15% of ammonium phosphate. The soil remediation agent is effective in remediation of soil contaminated by cadmium, lead, zinc, arsenic, copper and mercury.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution restoration, and specifically relates to a soil restoration agent. technical background: [0002] According to the “National Survey Bulletin on Soil Pollution Status” published by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall soil environmental conditions across the country are not optimistic, with heavy soil pollution in some areas, poor soil environmental quality of cultivated land, and serious environmental problems in industrial and mining wastelands. . Man-made activities such as industry, mining, agriculture, and high soil environmental background values ​​are the main reasons for soil pollution or exceeding standards. The country’s total soil over-standard rate was 16.1%, of which the proportions of slightly, lightly, moderately and severely polluted points were 11.2%, 2.3%, 1.5% and 1.1%. The type of pollution is mainly inorganic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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