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Activating agent for electrokinetic remediation of cadmium-contaminated soil and preparation method of activating agent

A technology for cadmium-contaminated soil and electric restoration, applied in the field of soil restoration, can solve the problems of poor biodegradability, high price and cost, changing soil physical and chemical properties and soil fertility, etc., and achieves the effects of low toxicity, low price, and good cadmium removal effect.

Pending Publication Date: 2022-03-25
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of inorganic activators and surfactants for repairing soil in the prior art, such as changing soil physical and chemical properties and soil fertility, high price and cost, and poor biodegradability, the present invention provides a method for electrically repairing cadmium-contaminated soil. An activator and a preparation method thereof, combining hydroxyethylidene diphosphonic acid and ferric chloride as a composite activator can greatly improve the leaching efficiency of heavy metals, and the energy consumption is lower than that of a traditional single organic acid or a single ferric chloride. Low environmental hazard and high removal efficiency

Method used

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  • Activating agent for electrokinetic remediation of cadmium-contaminated soil and preparation method of activating agent
  • Activating agent for electrokinetic remediation of cadmium-contaminated soil and preparation method of activating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method for an activator for electrically repairing cadmium-contaminated soil, comprising the steps of:

[0021] 1) Prepare respectively 0.2mol / L hydroxyethylidene diphosphonic acid and 0.05mol / L ferric chloride solution;

[0022] 2) Mix the hydroxyethylidene diphosphonic acid solution prepared in step 1) and the ferric chloride solution according to a volume ratio of 1:1, and stir evenly to obtain an activator for electrokinetic restoration of cadmium-contaminated soil.

[0023] The activator for electrodynamic restoration of cadmium-contaminated soil is obtained by adopting the preparation method of the above-mentioned activator for electrodynamic restoration of cadmium-contaminated soil.

Embodiment 2

[0025] A method for electrically repairing cadmium-contaminated soil, comprising the steps of:

[0026] 1) Prepare respectively 0.2mol / L hydroxyethylidene diphosphonic acid and 0.05mol / L ferric chloride solution;

[0027] 2) Mix the hydroxyethylidene diphosphonic acid solution prepared in step 1) and the ferric chloride solution according to a volume ratio of 1:1, and stir evenly to obtain an activator for electrically repairing cadmium-contaminated soil;

[0028] 3) Mix the activator and cadmium-contaminated soil obtained in step 2) for electrodynamic remediation of cadmium-contaminated soil according to the soil-water ratio of 4:1, put them into the electrolytic chamber, and use a DC voltage gradient of 1.0V / cm for continuous treatment for 24 Hour.

Embodiment

[0030] The present invention is verified in the experimental device of simulating electric restoration:

[0031] Among them, the electrodynamic restoration test tank is made of plexiglass, which is mainly divided into three parts: soil chamber (length × width × height = 10.0cm × 4cm × 9.0cm) and two electrode chambers (length × width × height = 5.5cm × 4cm × 9.0cm), connected at both ends of the soil chamber with baffles and filter paper, 230g of cadmium-contaminated kaolin (200.00g of air-dried kaolin and 120.00mL of 120mg / L cadmium nitrate solution) were loaded into the soil chamber for treatment, and all electrical repairs The experiments were all carried out at room temperature without any pH control;

[0032] The anode and cathode used in electrokinetic repair are both graphite plate electrodes (10.0cm×3.0cmx1.0cm), which are treated continuously for 24 hours with a DC voltage gradient of 1.0V / cm, and 0.2mol / L hydroxyethylidene diphosphonic acid and 0.05 The mixed soluti...

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Abstract

The invention discloses an activating agent for electrokinetic remediation of cadmium-contaminated soil and a preparation method of the activating agent, hydroxyethylidene diphosphonic acid and ferric chloride are combined as a composite activating agent, so that the leaching efficiency of heavy metals can be greatly improved, and the energy consumption is lower than that of traditional single organic acid or single ferric chloride; the environmental harm is low; and the removal efficiency is high.

Description

【Technical field】 [0001] The invention relates to the technical field of soil remediation, in particular to an activator for electrically remediating cadmium-contaminated soil and a preparation method thereof. 【Background technique】 [0002] In the soil, there are 8 main inorganic pollutants (Cd, Hg, As, etc.), among which the most serious soil pollutant is Cd, and the Cd content exceeds the standard rate by 7%. As we all know, cadmium is harmful to human health and the natural environment, and the treatment of cadmium-contaminated soil is one of the problems that need to be solved urgently in our country. Soil remediation technologies (such as phytoremediation, microbial immobilization, passivator technology, electrokinetic remediation, etc.) have been widely used in cadmium-contaminated soils. Among these technologies, electrokinetic remediation has been proven to be a promising technique for remediating fine-grained contaminated soils by many laboratory and field experim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/085C09K17/40
Inventor 陆登俊范毅烽刘涛涂凌云侯杼利罗舒文
Owner GUANGXI UNIV
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