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Preparation and application methods for amendment for heavy-metal contaminated soil

A technology that pollutes soil and heavy metals, applied in the field of heavy metal-contaminated soil remediation agents, can solve problems such as changing soil properties, affecting crop growth, and soil not being able to return to its original state

Inactive Publication Date: 2017-02-22
湖南新九方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While curing and stabilizing the heavy metals in the soil, most of the above-mentioned curing agents will cause soil compaction, damage the soil structure and change the soil properties. Long-term or large-scale application will prevent the soil from returning to its original state and affect the growth of crops.

Method used

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  • Preparation and application methods for amendment for heavy-metal contaminated soil
  • Preparation and application methods for amendment for heavy-metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The preparation method step of heavy metal contaminated soil remediation agent of the present invention is as follows:

[0044] S1. The dry calcium carbide slag produced when the dry acetylene method is used to produce polyvinyl chloride is crushed and sieved to remove impurities;

[0045] S2. Drying, crushing and sieving the calcium carbide slag produced during the production of polyvinyl chloride by the wet acetylene method;

[0046] S3. Evenly mix the dry calcium carbide slag obtained in steps S1 and S2, add it to a dry powder mixer, then add bio-organic fertilizer, polyacrylamide and chitosan in sequence according to the proportion, and stir evenly to obtain a heavy metal contaminated soil remediation agent.

Embodiment 1

[0048] Acidic paddy field soil application heavy metal contaminated soil remediation agent of the present invention: 1 mu of paddy field sampling test within the scope, choose the average value, pH value=3.3, each active ingredient and metal ion concentration in the soil are shown in Table 1.

[0049] Apply the heavy metal soil repair agent of the following ratio, and the content of each component in dry basis is as follows: the content of dry calcium carbide slag is 80wt%, the content of bio-organic fertilizer is 15wt%, the mass content of polyacrylamide is 3wt%, shell The mass content of polysaccharide is 2wt%.

[0050] The moisture content of dry calcium carbide slag is 20wt%, the particle size is 200 mesh, and Ca(OH) is calculated on a dry basis 2 The content is 90%.

[0051] The number of effective viable bacteria cfu in the bio-organic fertilizer is 0.2 billion / g, the moisture of organic matter is 30.0wt%, the pH value is 5.5, the number of fecal coliform bacteria is 10...

Embodiment 2

[0057] Acidic paddy field soil application heavy metal contaminated soil remediation agent of the present invention: 1 mu of paddy field sampling test within the scope, choose average value, pH value=4.6.

[0058] Apply the heavy metal soil repair agent of the following proportioning, the content of each component is as follows on a dry basis: the content of dry carbide slag is 75wt%, the content of the bio-organic fertilizer is 20wt%, and the mass content of the polyacrylamide is 4wt%, the mass content of the chitosan is 1wt%.

[0059] The moisture content of dry calcium carbide slag is 14wt%, the particle size is 50 mesh, and Ca(OH) is calculated on a dry basis 2 The content is 92%.

[0060] The number of effective viable bacteria cfu in the bio-organic fertilizer is 0.1 billion / g, the moisture of organic matter is 23.0wt%, the pH value is 7.5, the number of fecal coliform bacteria is 80 / g or 80 / mL, and the mortality rate of roundworm eggs is 99%. .

[0061] The polyacryl...

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Abstract

The invention relates to the technical field of soil remediation and environmental protection and particularly relates to an amendment for heavy-metal contaminated soil. The amendment is prepared through mixing raw materials, i.e., dry carbide slag, a bio-organic fertilizer, polyacrylamide and chitosan, and the pH value of the amendment is 11 to 12. The amendment for the heavy-metal contaminated soil can be used for adjusting the pH value of the soil; the amendment has special enriching, absorbing and degrading capability to heavy metal elements in the soil; the degraded amendment is a high-quality organic fertilizer, can be absorbed by crops and can play an important role in the aspects of controlling soil erosion and preventing loss of soil and water; soil hardening cannot be caused while the soil is amended; and the preparation process for the amendment for the heavy-metal contaminated soil is simple, the main raw materials, i.e., the dry carbide slag and the bio-organic fertilizer are low in cost, heavy metals in the soil are effectively amended, the injury to the crops, human bodies and animals caused by the heavy metals is eliminated, the adsorbing capacity of the soil to nitrogen is improved, and the effectiveness of plant nutrient elements in the soil is improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation and environmental protection, in particular to a heavy metal polluted soil remediation agent. Background technique [0002] At present, the area of ​​cultivated land polluted by heavy metals in mainland China is nearly 20 million hectares, accounting for about 1 / 5 of the total area of ​​cultivated land. With the continuous development of industry and agriculture, soil heavy metal pollution is still intensifying, especially in mining, processing, transportation, production and use. 1. During the waste treatment process, a large amount of heavy metals eventually flow into the soil through various channels, causing serious pollution. Under the condition of low pH value, the heavy metals in the soil enter the water body, plants and animals in active ion state, and then endanger the health of human and animals through the food chain. Therefore, the remediation of heavy metal-contaminated soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10C09K109/00C09K101/00
CPCC09K17/40B09C1/08B09C1/10C09K2101/00C09K2109/00
Inventor 廖军成一知
Owner 湖南新九方科技有限公司
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