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A modified clay-based heavy metal compound polluted soil remediation agent and preparation method thereof

A technology for compound pollution and soil remediation, applied in soil conditioning materials, chemical instruments and methods, fertilizer mixtures, etc., to achieve the effects of low price, improved capacity, and low risk of environmental damage

Active Publication Date: 2018-09-11
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, on the basis of the existing research, to provide a universal repairing agent for multi-component modified bentonite and Its preparation method is to provide a modified clay-based heavy metal compound polluted soil remediation agent and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Dissolve the natural bentonite in deionized water at a ratio of 75g / L, place the container containing the mixed solution on a shaker and shake until the bentonite is evenly dispersed; then centrifuge the mixed solution at a speed of 550r / min for 7.5min, take the upper mixed solution, Remove particles with a particle size greater than 2 microns at the bottom of the centrifuge tube; then centrifuge the collected upper layer mixture at a centrifugal speed of 5000r / min, remove the supernatant, take out the bentonite at the bottom, dry it at 50°C, and grind it through 200 mesh Sieve tray, soak the purified bentonite twice with 1.5mol / L sodium chloride solution, centrifuge at 5000r / min to remove the supernatant, and collect the bentonite at the bottom of the centrifuge tube; then wash the bentonite obtained twice with deionized water to obtain the component a.

[0028] 100% A component is selected for the preparation of the contrast type medicament.

[0029] Prepare Ni, Cu an...

Embodiment 2

[0031] According to [OH-] / [Al 3+ ]=2.4 / 1 ratio NaOH solution is added dropwise to AlCl under continuous stirring 3 ·6H 2 O solution to obtain an aluminum hydroxide solution with a concentration of 0.2 mol / L, aging for 18 hours after the reaction is complete, to obtain a pillar liquid (that is, a mixed solution of polyhydric aluminum ion pillaring agent and water), and the prepared pillar The solution was left at room temperature for 2 days. Add appropriate amount of deionized water in component A to prepare component A content as the bentonite suspension of 30g / L, and the pillar liquid is passed through the peristaltic pump according to [Al 3+ ] / bentonite at a ratio of 10 mmol / g was added to the bentonite suspension for ion exchange reaction, and heated at 65° C. for 48 h for columnization reaction. The separated solid particles were washed with deionized water several times, dried at 80°C, ground, and then activated at 100°C for 2 hours to obtain component B.

[0032] 100...

Embodiment 3

[0035] Add 15g of component A in every 100mL of water to prepare component A aqueous solution, and add organic surfactant hexadecyltrimethylammonium bromide according to the proportion of component A cation exchange capacity of 100%, and stir for 1.5 hours. After centrifugation, wash with deionized water several times, dry at 60°C, grind through a 200-mesh sieve, and finally activate at 110°C for 3 hours to obtain component C.

[0036] 100% C component was selected for the preparation of the contrast type medicament.

[0037] Prepare Ni, Cu and Cr-contaminated soil with a concentration of 400mg / Kg, add the agent according to the ratio of agent:soil weight ratio of 1:10, mix well and add water with 10% of the soil mass. After 72 hours of curing, the soil was tested for toxicity leaching. It was found that compared with the soil without stabilizers, the stabilization efficiencies of Ni, Cu and Cr after adding the agents were 2.7%, 3.8% and 23.8%, respectively. The overall stabi...

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Abstract

The invention discloses a heavy metal combined pollution soil remediation agent based on modified clay and a preparation method of the agent. The agent comprises 10-15wt% of a component A, 30-65wt% of a component B and 25-60wt% of a component C. The agent is a multi-component modified bentonite universal compound remediation agent used for treating multi-heavy-metal combined pollution soil; bentonite is adopted as a template of the agent, the different modified bentonite components can be prepared according to different modification methods, and then the component proportion of the agent can be adjusted according to the different types and contents of heavy metals in the soil; the component A contains sodium-based large-diameter bentonite particles which aim at heavy metal pollutants of relatively wide types; the component B contains inorganic pillar bearing modified bentonite particles which have an relatively good effect on stabilizing cationic heavy metal pollutants; the component C is organic modified bentonite particles which have a relatively good effect on stabilizing anionic heavy metal pollutants. Accordingly, the remediation effect on complex heavy metal pollution soil of the agent can be improved by adjusting the proportions of the three components.

Description

Technical field: [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a modified clay composite material for remediation of heavy metal-contaminated soil, that is, to a modified clay-based heavy metal-contaminated soil remediation agent and a preparation method thereof. Background technique: [0002] Industrial wastes, agricultural irrigation, application of chemical fertilizers and pesticides, long-term emission of vehicle exhaust, etc. make the soil heavy metal pollution in my country very serious :48-49]. On the one hand, heavy metals in the soil will endanger the health of humans and animals by polluting the food chain or the atmosphere, causing cancer or chronic diseases; on the other hand, it may lead to crop yield reduction or failure. At present, the treatment methods of soil heavy metal pollution can be summarized into four types: physical engineering measures, biological measures, improvem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K101/00
Inventor 喻恺罗启仕蒋婷婷吉敏王旌朱杰
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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