Efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil

A technology for repairing medicaments and polluted soil, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. It can solve the problems of reducing the amount of inorganic substances added, falling, and the effect of heavy metal repairing is not strong, so as to reduce the toxicity degree of effect

Active Publication Date: 2014-09-10
爱土工程环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microbial remediation technology has the advantages of wide sources of microorganisms and low impact on the environment, but specific microorganisms can only deal with a single type of heavy metals, and are greatly affected by environmental conditions
[0006] The applicant has developed a stable repair agent for heavy metals in soil, which is formed by mixing gypsum, magnesium oxide, and diatomaceous earth, adding it to heavy metal-contaminated soil, through precipitation, adsorption, complexation, oxidation- Reduction and other effects chemically react with heavy metals such as cadmium, zinc, copper, lead, and mercury in the soil environment, making the heavy metals form a stable chemical form, preventing their migrat

Method used

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  • Efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil
  • Efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil

Examples

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preparation example Construction

[0035] The preparation method of described carboxymethyl cellulose-melamine formaldehyde resin is specifically:

[0036] The first step is to mix 250g of melamine with 400ml of 37% formaldehyde aqueous solution and 200ml of water, stir evenly, then add triethanolamine to adjust the pH value to 8-9, and react at 72°C for 75min to obtain a melamine resin preform. Polymer;

[0037] In the second step, 300g of polystyrene maleic anhydride and 120g of paraffin were mixed, then added to 300ml of water, and emulsified and dispersed for 30 minutes at a certain speed using a high-speed dispersing homogenizer to obtain a paraffin emulsion;

[0038] The third step is to dissolve 300g of carboxymethyl cellulose in 20L of water to prepare a carboxymethyl cellulose solution, add it to the melamine resin prepolymer, and stir in an ice-water bath at 600r / min for 10 minutes to obtain a melamine resin A mixed solution of prepolymer and carboxymethyl cellulose;

[0039] Step 4: Slowly add the ...

Embodiment 1

[0050] Embodiment 1 The preparation of carboxymethyl cellulose-melamine formaldehyde resin

[0051] Mix 250g of melamine with 400ml of 37% formaldehyde aqueous solution and 200ml of water, stir evenly, then add triethanolamine to adjust the pH value to 8-9, and react at 72°C for 75min to obtain a melamine resin prepolymer. Mix 300g polystyrene maleic anhydride with 120g paraffin wax, then add it to 300ml water, use a high-speed dispersing homogenizer at a certain speed, emulsify and disperse for 30min to obtain a paraffin wax emulsion, dissolve 300g carboxymethyl cellulose in 20L water, and prepare Form a carboxymethyl cellulose solution, add it to the melamine resin prepolymer, stir in an ice-water bath at 600r / min for 10min, and obtain a mixed solution of the melamine resin prepolymer and carboxymethyl cellulose, at 85°C Under constant temperature water bath and stirring at 400r / min, slowly drop the mixture of melamine resin prepolymer and carboxymethyl cellulose into the pa...

Embodiment 2

[0053] Example 2 Hydroxypropyl modified SiO 2 / Preparation of Chitosan Nanoparticles

[0054] Mix 2.5L ethyl silicate, 5L absolute ethanol and 5L deionized water evenly, reflux and stir at 80°C for 1h, then adjust the pH of the solution to 6 with acetic acid, and continue stirring for 1h to make SiO 2 Sol, get 8g epichlorohydrin and acidify to pH value 6 with HCl, SiO prepared in front 2 Disperse the sol with 50L of absolute ethanol to obtain a dispersion, add the previously acidified epichlorohydrin dropwise to the dispersion, control the temperature at 40°C for 7 hours, evaporate the solvent and unreacted epichlorohydrin to obtain a white solid powder , dried in vacuum at 50°C for 6h to obtain hydroxypropylated SiO 2 , disperse 2kg chitosan in 40L isopropanol, basify with 0.3kg sodium hydroxide for 3h at a constant temperature of 40°C, then add 2.5kg hydroxypropylated SiO obtained above 2 , reacted at a constant temperature of 45°C for 5h, cooled, filtered with suction, ...

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Abstract

The invention provides an efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil. The efficient solidifying and stabilizing repair agent comprises the following raw materials: gypsum, magnesium oxide, kieselguhr, carboxymethylcellulose-melamine formaldehyde resin and hydroxypropyl-modified SiO2/chitosan nanoparticles. According to the agent provided by the invention, two organic matters are added, so that the additive amount of the inorganic matters can be greatly reduced, and the property of the soil is not greatly destroyed; meanwhile, the two organic matters are not easily decomposed in the soil, and the toxic level of the heavy metals in the environment still can be well reduced on the basis of reducing the damage to the property of the soil.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of heavy metal-contaminated soil, in particular to an efficient solidification, stabilization and restoration agent for heavy metal-contaminated soil. Background technique [0002] Heavy metals refer to a class of metal elements with a specific gravity greater than 5. The harm of heavy metal pollution is mainly reflected in two aspects. One is that heavy metals cannot be degraded in the environment and are used to accumulate in organisms to cause teratogenicity or mutation of organisms. On the other hand, heavy metals can be transmitted through the food chain. Once they enter the human body, After a period of accumulation, it will cause great harm to human health. The recently released National Soil Pollution Survey Bulletin pointed out that the total soil pollution rate in the country was 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted site...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 周愈尧段建宏李娜何依琳任长存
Owner 爱土工程环境科技有限公司
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