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Composite leacheate applied to repair of lead-contaminated soil and capable of improving soil fertility and preparation process of composite leacheate

A lead-contaminated soil and soil fertility technology, applied in the field of soil remediation and pollution treatment, can solve the problems of soil fertility reduction, destruction, secondary pollution, etc., and achieve the effect of improving soil fertility

Inactive Publication Date: 2019-08-20
苏州碧水依云环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used leaching agents have their own shortcomings: inorganic acids and oxidants can greatly damage the soil properties, inorganic leaching agents such as FeCl3 will reduce soil fertility, and artificial chelating agents such as EDTA are not easy to decompose and can cause secondary pollution. , natural organic acids such as citric acid are less efficient, and new eluents such as saponin and nanomaterials are expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The surface soil (0-20cm) in the paddy field is leached, the lead concentration in the soil is 9.25mg / kg, the pH of the oxalic acid composite eluate is 6, the concentration of ferric chloride is 0.2 mol / L, and the liquid-to-soil ratio is 2: 1. The leaching time is 2 hours, and the removal rate of lead in the soil is 93%.

Embodiment 2

[0034] The surface soil (0-20cm) of the factory polluted site was leached, the lead concentration in the soil was 726 mg / kg, the pH of the citric acid compound eluent was 5, the concentration of ferric chloride was 0.4 mol / L, and the liquid-to-soil ratio was 3:1, and the leaching time was 4 h, the removal rate of lead in soil was 85%.

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PUM

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Abstract

The invention discloses a composite leacheate which is applied to repair of lead-contaminated soil and is capable of improving soil fertility. The composite leacheate comprises choline chloride, ureaand water, wherein the molar ratio of the choline chloride to the urea to water is (1-2):(2-3):2. The removal rate of lead in soil can reach 85-93% through the composite leacheate, the structure and pH value of the leached soil are unchanged, and the content of total nitrogen, total organic carbon and rapidly available phosphorus are improved after leaching is performed. The composite leacheate isnon-toxic, harmless and easily degradable, and no secondary pollution to the soil environment is caused by residual composite leacheate.

Description

technical field [0001] The invention relates to the technical field of soil remediation and pollution treatment, in particular to a compound eluent for remediating lead-contaminated soil that can improve soil fertility and a preparation process. Background technique [0002] Among the existing site remediation technologies, methods that can remove cadmium and fundamentally remediate soil include leaching, electrokinetic remediation and bioseparation. The leaching method uses the desorption and dissolution of chemical reagents to transfer heavy metals from the solid phase of the soil to the liquid phase. It has the advantages of high removal rate, fast repair speed, low energy consumption, simple operation, low cost, and large treatment capacity. There are many application examples. However, the currently commonly used leaching agents have their own shortcomings: inorganic acids and oxidants can greatly damage the soil properties, inorganic leaching agents such as FeCl3 will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04C05G3/00C09K17/14C09K17/40C05G3/80
CPCC05G3/00C05C9/00C09K17/14C09K17/40C05G3/80
Inventor 邓芸
Owner 苏州碧水依云环保科技有限公司
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