Soil remediation method

A soil remediation and soil technology, applied in the field of soil remediation, can solve problems such as soil remediation with chitosan that have not yet been seen

Inactive Publication Date: 2010-09-15
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report that ch

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0021] The specific embodiment one is a soil restoration method, comprising the following steps:

[0022] 1) In the soil polluted area, set up a liquid injection well where the pump injects the chitosan eluent. The chitosan eluent dissolves 1.2g chitosan powder in 100ml 0.1mol / L hydrochloric acid, and then dilutes it with water to 1L hydrochloric acid solution for dissolution. It is prepared with 0.3g chitosan, and the dosage is determined according to the soil heavy metal pollution, that is, the mass ratio of injected chitosan to the heavy metal contained in the soil is 1: (1-5); Inside the soil, the soil filtrate seeps into the groundwater again, and the heavy metal active components in the soil and groundwater are eluted by the chitosan eluent, forming a stable chitosan-metal chelate;

[0023] 2) A permeable reaction wall filled with active substances is built in the vertical direction of the groundwater flow around the injection well, and the soil filtrate and polluted gro...

specific Embodiment approach 2

[0029] Embodiment 2 A method for soil remediation, the steps of which are the same as those in Embodiment 1. The difference is that the chitosan eluent is prepared by dissolving 0.8g chitosan powder in 100ml 0.1mol / L hydrochloric acid, then diluting with water until 0.1g chitosan is dissolved in 1L hydrochloric acid solution; active material components and weight percentages are as follows:

[0030] Iron filings 30%;

[0031] Activated carbon 20%;

[0032] Fly ash 35%;

[0033] Ammonium chloride 10%;

[0034] Potassium Phosphate 5%.

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Abstract

The invention relates to a soil remediation method, which comprises the following steps that: 1) a liquid injecting well for injecting chitosan leacheate through a pump is arranged in a soil polluted area, the chitosan leacheate enters the inside of polluted soil through the liquid injecting well, soil percolate seeps through underground water, and heavy metal active ingredients in the soil and the underground water are eluted by the chitosan leacheate to form stable chitosan-metal chelate; and 2) a permeable reactive barrier filled with active substances is constructed in a direction which is vertical to the flow direction of the underground water at the periphery of the liquid injecting well, the soil percolate and the polluted underground water flow through the permeable reactive barrier filled with the active substances, and polluted substances such as the chitosan-metal chelate and the like in the soil and the underground water are removed. Through the soil remediation method, heavy metals in the soil can be effectively removed, a polluted underground water system can be remediated, and most of the heavy metals contained in the soil and the underground water can be gathered in the active substances of the permeable reactive barrier, so that the heavy metals can be recycled. The heavy metal content of the remediated soil and the water quality of the percolate passing through the reactive barrier meet the corresponding national standard.

Description

technical field [0001] The invention relates to soil repair, in particular to a soil repair method using chitosan leaching-permeable reaction wall. Background technique [0002] The existing simple chemical remediation methods for heavy metal-contaminated soil are expensive, cause secondary pollution to the environment, and have poor operability, especially for large-scale soil pollution control, which has specific operational difficulties. Chitosan (Chitosan), also known as soluble chitin, chitosan, chitosan, the chemical name is 2-amino-β-1,4-glucan, the molecular formula is (C 6 h 11 o 4 N)n is a natural cationic polysaccharide produced after deacetylation of chitin. With degradability, good film-forming properties, good biocompatibility, and certain antibacterial and anti-tumor properties, it has been widely used in medicine, food, chemical industry, environmental protection, agriculture and other industries, among which the environmental protection industry is used a...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 廖志民陶涛郭景奎何其虎邹莲花姜薇沈平锐王鹏杨欣龙斌周佳琳杨圣云
Owner JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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