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Method for enriching heavy metals and organic matters in soil

A technology of heavy metals and organic matter, applied in the restoration of polluted soil, etc., can solve the problems of expensive chemical eluent, unsuitable viscosity, secondary pollution, etc., and achieve short enrichment time, easy operation, and low cost Effect

Active Publication Date: 2013-11-27
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical eluents are expensive, prone to secondary pollution and other problems, and are not suitable for sticky or semi-sticky soils, only suitable for sandy soils

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Remediation of lead-contaminated soil

[0021] The main body of the electrodynamic heavy metal enrichment device is a rectangular plexiglass tank, which consists of a soil column chamber (20cm×15cm×10cm), an electrode chamber (5cm×15cm×10cm), a regulated DC power supply, and a high-purity graphite electrode (10cm 2 ×10cm), peristaltic pump, etc. During the experiment, a layer of filter paper is used to separate the anode chamber from the soil column chamber, and a layer of cation exchange membrane (CEM) is used to separate the cathode chamber from the soil column chamber, which not only prevents the soil from entering the electrode chamber, but also prevents the OH produced by the cathode. -Into the soil, causing the pH of the soil to increase and reduce the removal effect of heavy metal Pb. The distance between electrodes was 20 cm, and the potential gradient was 1 V / cm. The cathode and anode poles respectively use a set of circulation system to clean t...

Embodiment 2

[0025] Embodiment 2: Remediation of lead-contaminated soil

[0026] The same experimental device as in the above-mentioned Example 1 carried out the lead enrichment experiment on the same lead-contaminated soil, the difference being that 0.1M EDTA solution was added in the cathode chamber as the cathode control solution.

[0027] The operation steps of the electrokinetic enrichment experiment are slightly different from those in Example 1. Before the experiment starts, add KI solution into the soil column chamber first, then slowly inject the test soil sample into the soil column chamber, and fully mix with KI solution (water-to-soil ratio is 1:2) to remove air bubbles in the soil and avoid increasing resistance. The cathode and anode liquids are all distilled water, so that the anode liquid level, the test soil and the cathodic liquid level are at the same height, turn on the peristaltic pump, pass distilled water into the cathode and anode chambers, and run for 24 hours to ...

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Abstract

The invention discloses a method for enriching heavy metals and organic matters in soil. The method is characterized in that an electric field is formed in soil through setting up an electric enriching system, the heavy metals and organic matters in soil are enriched in an area through the electroosmotic flow and the electromigration effects, and separation and purification are carried out; the electric enriching system is composed of an adjustable direct current supply, an anode chamber, a cathode chamber, soil, electrodes and a cation exchange membrane; and the anode chamber and an anode are positioned at two sides of the electric enriching system, the cathode chamber and a cathode are positioned at two sides of the electric enriching system, soil is positioned between the two electrodes, the cation exchange membrane is arranged between the cathode chamber and the soil, and the adjustable direct current supply is connected with the anode and the cathode. The method has the advantages of short plant enriching time, no influences by natural factors, and no specificity to the enrichment of the heavy metals to realize waste resource utilization and soil restoration.

Description

technical field [0001] The invention relates to a method for enriching heavy metals / organic substances in soil, in particular to a method for enriching heavy metals / organic substances in soil by using electrokinetics. Background technique [0002] With the rapid development of global economy, pollutants containing heavy metals / organic substances enter the soil through various channels, causing serious soil pollution. Soil heavy metal / organic pollution can affect the decline of crop yield and quality, and can endanger human health through the food chain, and can also lead to further deterioration of air and water environment quality, so it has attracted widespread attention from all over the world. [0003] Heavy metal pollution is mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and the use of heavy metal products. It has the characteristics of concealment, long-term effect and refractory degradation, so it is difficult to deal with it ...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 邹华张涛计敏惠
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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