Remediation method of heavy metal contaminated soil

A technology of polluted soil and remediation method, applied in the restoration of polluted soil and other directions, can solve problems such as hidden safety hazards, incomplete removal, secondary soil pollution, etc., and achieve the effects of easy operation, novel structure and convenient use.

Active Publication Date: 2014-04-09
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional chemical leaching method to repair soil heavy metal pollution will destroy the structure of the soil itself and make the soil difficult to recycle. Some leaching agents are difficult to biodegrade and will cause secondary pollution to the soil. Some leaching agents are expensive and cause The washing method is difficult to popularize and apply in engineering
Some scholars use humic acid and activated sludge to treat heavy metal-contaminated soil, which can improve the secondary pollution of soil caused by leaching agents, but at the same time, there is a problem of complex domestication conditions for activated sludge.
Tea saponin and citric acid have the characteristics of biodegradability and no secondary pollution. Some scholars have studied the repair effect of single leaching of tea saponin and citric acid on soil heavy metals, but a single leaching agent has the effect of compounding multiple heavy metals. The remediation of contaminated soil has limitations, and the commercially available tea saponin is expensive, although it is environmentally friendly, it is difficult to popularize and apply
At the same time, the eluent containing heavy metal pollution still exists in the soil and has not been completely removed, posing certain safety hazards

Method used

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  • Remediation method of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The remediation method of heavy metal polluted soil provided by the invention comprises the following steps:

[0025] Step 1. Apply humic acid with a thickness of 1 to 5 cm on the surface of the heavy metal-contaminated soil, mix the soil 25 cm thick below the surface of the polluted soil with the humic acid evenly by plowing, and react for 10 days;

[0026] Step 2. After the treatment in step 1, pre-embed a plurality of rinsing devices under the area where the soil is polluted by heavy metals. The rinsing devices include a plurality of drain pipes arranged in parallel with each other. Both ends are sealed and a number of holes are opened on the upper side wall. The two ends of the discharge pipe are respectively erected on two support rods, and a rotating mechanism is arranged between each two discharge pipes. The structure includes a cutter shaft and a rotary knife arranged on the cutter shaft, and the two ends of the cutter shaft are respectively erected on the two s...

Embodiment 2

[0036] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0037] Step 1. Apply humic acid with a thickness of 1 to 5 cm on the surface of the heavy metal-contaminated soil, and mix the soil with a thickness of 20 to 30 cm below the surface of the polluted soil and the humic acid evenly by plowing, and react for 7 to 15 days;

[0038] Step 2. After the treatment in step 1, pre-embed a plurality of rinsing devices under the area where the soil is polluted by heavy metals. The rinsing devices include a plurality of drain pipes arranged in parallel with each other. Both ends are sealed and a number of holes are opened on the upper side wall. The two ends of the discharge pipe are respectively erected on two support rods, and a rotating mechanism is arranged between each two discharge pipes. The structure includes a cutter shaft and a rotary knife arranged on the cutter shaft, and the two ends of the cutter shaft are respectively erected on the two sup...

Embodiment 3

[0048] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0049] Step 1. Apply humic acid with a thickness of 3 cm on the surface of the heavy metal-contaminated soil, mix the soil with a thickness of 25 cm below the polluted soil surface with the humic acid by plowing, and react for 7 days;

[0050] Step 2. After the treatment in step 1, pre-embed a plurality of rinsing devices under the area where the soil is polluted by heavy metals. The rinsing devices include a plurality of drain pipes arranged in parallel with each other. Both ends are sealed and a number of holes are opened on the upper side wall. The two ends of the discharge pipe are respectively erected on two support rods, and a rotating mechanism is arranged between each two discharge pipes. The structure includes a cutter shaft and a rotary knife arranged on the cutter shaft, and the two ends of the cutter shaft are respectively erected on the two support rods;

[0051] Step 3: Pump ...

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Abstract

The invention discloses a remediation method of heavy metal contaminated soil. The remediation method comprises the steps of applying humic acid on the surface of the heavy metal contaminated soil, turning and evenly mixing the soil with a thickness of 20-30 cm from the contaminated soil surface layer with the humic acid, reacting for 7-15 days and then pre-burying leaching device under a contaminated area of the heavy metal contaminated soil; leaching the soil by using a citric acid solution and a tea saponin solution in sequence through the leaching device, and recycling leaching liquid of the leaching device and leaching liquid containing heavy metals to process intensively after finishing leaching; then applying fruit residues on the soil surface, turning and evenly mixing the fruit residues with the soil with a thickness of 20-30 cm from the soil surface layer, intercropping sunflowers and brassica juncea, harvesting all the biomasses on the ground after the plants are ripe to process intensively. Due to the adoption of the method, high removal rates of various heavy metal ions in the soil are achieved; the soil is remediated completely; meanwhile, the method is low in cost, good in effect and easy to implement.

Description

technical field [0001] The invention relates to a repair method for heavy metal polluted soil. Background technique [0002] The traditional chemical leaching method to repair soil heavy metal pollution will destroy the structure of the soil itself and make the soil difficult to recycle. Some leaching agents are difficult to biodegrade and will cause secondary pollution to the soil. Some leaching agents are expensive and cause The leaching method is difficult to popularize and apply in engineering. Some scholars use humic acid and activated sludge to treat heavy metal-contaminated soil, which can improve the secondary pollution of soil caused by leaching agents, but at the same time there is a problem of complex domestication conditions of activated sludge. Tea saponin and citric acid have the characteristics of biodegradability and no secondary pollution. Some scholars have studied the repair effect of single leaching of tea saponin and citric acid on soil heavy metals, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
Inventor 吴烈善吕宏虹曾冬梅咸思雨孔德超
Owner GUANGXI UNIV
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