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Novel environment-friendly reagent for reducing leaching concentration of various heavy metals

A technology for leaching concentration and heavy metals, applied in water/sludge/sewage treatment, application, organic fertilizer, etc., can solve problems such as long maintenance time, high repair cost, secondary pollution, etc., to improve repair effect and simplify production process , the effect of reducing the usage ratio

Inactive Publication Date: 2014-02-05
SHAOXING ENVIRONREM ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, the stabilizing effect of most chemical stabilizers on soil can only last for several months or even a few days. Secondary pollution
[0003] At the same time, the stabilizing agents currently produced in the domestic and international markets are mainly solid powder agents, and the use of solid powder remediation agents also has the following disadvantages: ① When powder agents are used to treat polluted soil, the mixing time of agents and soil is long and the uniformity is poor. The amount of agent added is relatively large, and the curing time is relatively long
②Powder agents are used for heavy metal soil treatment, and usually only ex-situ repair can be used. Due to the use of ex-situ repair, the project volume is large, the project time is long, and the repair cost is high

Method used

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Embodiment Construction

[0013] A new type of environment-friendly chemical agent for reducing the leaching concentration of various heavy metals according to the present invention. The formula of the environment-friendly agent is: 0-30wt% sodium polysulfide, 1-25wt% sodium silicate, 0-15wt% organic sulfur TMT- 15. 0-20wt% hydrazine hydrate, 1-20wt% phosphate, 1-10wt% sodium sulfide, 0-15wt% ferrous sulfate, 0-5% potassium permanganate, 0-5wt% citric acid and 0-5wt% % ethylenediaminetetraacetic acid (EDTA).

[0014] The phosphate is one or more mixtures of sodium phosphate, sodium dihydrogen phosphate, diammonium hydrogen phosphate or disodium hydrogen phosphate.

[0015] The formula of the environmental protection agent can add 1-5wt% surfactant according to the difference of the nature of the polluted soil.

[0016] In this specific implementation, the in-situ restoration process can be carried out in-situ mixing or in-situ injection of soil and chemicals according to the site conditions.

[0017]...

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PUM

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Abstract

The invention discloses a novel environment-friendly reagent for reducing leaching concentration of various heavy metals. The formula of the environment-friendly reagent comprises 0-30wt% of sodium polysulfide, 1-25wt% of sodium silicate, 0-15wt% of organic sulfur TMT-15, 0-20wt% of hydrazine hydrate, 1-20wt% of phosphate, 1-10wt% of sodium sulphide, 0-15wt% of ferrous sulfate, 0-5% of potassium permanganate, 0-5wt% of citric acid and 0-5wt% of edetic acid (EDTA). The novel environment-friendly reagent can be applied to ex-situ remediation of the traditional hazardous waste containing the heavy metals, and can also be applied to in-situ remediation of pollution site soil and underground water containing the heavy metals.

Description

technical field [0001] The invention relates to a novel environment-friendly agent for reducing the leaching concentration of various heavy metals. Background technique [0002] At present, the situation of heavy metal pollution is severe, and its treatment has become an urgent problem. The use of stabilizing agents to reduce the leaching concentration of heavy metals in soil and various hazardous wastes is considered to be an effective restoration method, accounting for almost 20-30% of all heavy metal pollution restoration projects, so the use of stabilizing agents Usage becomes the key factor of this technology. The general principle of the chemical stabilization method is to add a chemical stabilization agent to the pollutants to cause a chemical reaction with the pollutants, so that the free heavy metals form stable substances and lose their toxicity. This method has higher requirements on chemical agents. For a long time, the stabilizing effect of most chemical sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C02F1/72A62D3/38C02F101/20A62D101/43
Inventor 廖清琳
Owner SHAOXING ENVIRONREM ENVIRONMENTAL TECH CO LTD
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