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Optimized injection system for underground water in-situ chemical remediation agent

A technology of chemical restoration and repairing agents, applied in the restoration of contaminated soil, etc., can solve the problems of complex chemical reaction conditions, slow agent injection speed, high agent residue, etc., to improve safety, shorten injection time, and reduce repair costs Effect

Pending Publication Date: 2020-07-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, due to the limited hydrogeological conditions of the polluted site, when the permeability coefficient of the aquifer is small, the in-situ chemical remediation technology has defects such as slow injection speed, long period, and easy backwashing.
Secondly, the mass transfer and chemical reaction conditions of groundwater pollutants are complicated. Excessive injection of chemicals is often used to ensure the degradation effect of pollutants, but the operation cost is high and the chemical residues are high.

Method used

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  • Optimized injection system for underground water in-situ chemical remediation agent

Examples

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Effect test

Embodiment 1

[0029] This project is a groundwater restoration project for a chemical plant in Southwest China, with a groundwater restoration area of ​​247,000 square meters. There are two layers of silty clay on this site, and the aquifer is a round gravel layer. The average water level is buried at a depth of 15m, and the thickness of the aquifer is 14-20m. The target pollutants in groundwater are 1,1-dichloroethane, chloroform and other organic substances. The initial value of water quality is pH 4.41, ORP is 102mV and conductivity is 32μs / cm. The restoration technology adopts the system of the present invention, and the oxidizing agent used is sodium persulfate. Add solid sodium persulfate to the injection tank, add water and turn on the agitator to make a mass concentration of 100kg / m 3 sodium persulfate solution, the stirring speed of the stirrer is 50r / min. Set the target value of the input static pressure liquid level gauge to 25m through the PLC control box, set the liquid level...

Embodiment 2

[0031]This project is a groundwater restoration project for a chemical plant in Southwest China, with a groundwater restoration area of ​​247,000 square meters. There are two layers of silty clay in this site, and the aquifer is a round gravel layer, with an average buried depth of 15m and an aquifer thickness of 14-20m. The target pollutants in groundwater are organic compounds such as vinyl chloride and 1,2-dichloroethane. The initial value of water quality is pH 5.71, ORP 65mV and conductivity 98.7μs / cm. The restoration technology adopts the system of the present invention, and the oxidizing agent used is sodium persulfate. Add solid sodium persulfate to the injection tank, add water and turn on the agitator to make a mass concentration of 80kg / m 3 sodium persulfate solution, the stirring speed of the stirrer is 60r / min. Set the target value of the input static pressure liquid level gauge to 24m through the PLC control box, set the liquid level in the injection well and ...

Embodiment 3

[0033] This project is a groundwater restoration project for a machinery factory site, with a restoration area of ​​about 60 mu. The stratum of the site is miscellaneous fill and clay from top to bottom, and the aquifer is a round gravel layer. The buried depth of the water level is 4-7m, and the thickness of the aquifer is about 2-4m. The groundwater at the original site was polluted by carbon tetrachloride, vinyl chloride and chloroform. The initial value of the water quality is pH 5.77, ORP 88mV and conductivity 79.1 μs / cm. The restoration technology adopts the system of the present invention, and the oxidizing agent used is sodium persulfate. Add solid sodium persulfate to the injection tank, add water and turn on the agitator to make a mass concentration of 50kg / m 3 sodium persulfate solution, the stirring speed of the stirrer is 70r / min. Set the target value of the input static pressure liquid level gauge to 7m through the PLC control box, set the liquid level in the ...

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Abstract

The invention discloses an optimized injection system for an underground water in-situ chemical remediation agent. The system comprises a remediation agent injection device, a groundwater monitoring well and a remediation agent injection control system, the remediation agent injection device is composed of a chemical injection tank and a chemical injection well, a throw-in type water quality sensor is arranged in the groundwater monitoring well, the remediation agent injection control system comprises a variable frequency pump, a frequency converter, an electromagnetic flowmeter, a throw-in type static pressure liquidometer and a PLC, the throw-in type static pressure liquidometer is installed in the chemical injection well, the variable frequency pump and the electromagnetic flowmeter areinstalled on a chemical injection pipeline, and the frequency converter, the electromagnetic flowmeter, the throw-in type static pressure liquidometer and the throw-in type water quality sensor are all in circuit connection with the PLC. By means of the injection system, the underground water in-situ remediation agent can be smoothly and continuously injected into pores of the aquifer medium, theagent injection time is shortened, the remediation period is shortened, the reverse grouting phenomenon can be completely avoided in the agent injection remediation process, and the safety of underground water in-situ chemical remediation is improved.

Description

technical field [0001] The invention relates to the technical field of groundwater in-situ restoration, in particular to an in-situ chemical restoration agent optimization injection system for groundwater. Background technique [0002] The remediation and prevention of groundwater pollution has ushered in a period of rapid development, and many groundwater remediation technologies, such as in-situ chemical remediation technology, permeable reaction walls, bioremediation technology, and natural attenuation monitoring technologies, are gradually being applied to practical projects. In-situ chemical oxidation technology is a technology that converts pollutants in groundwater into non-toxic or low-toxic substances by injecting remediation agents into groundwater contaminated areas and through the oxidation or reduction of agents. Compared with other remediation technologies, this technology only needs to inject the remediation agent into the groundwater aquifer through the injec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/002B09C1/08B09C2101/00
Inventor 谢湉卢桂宁党志李书迪张荣海张芊苏丽丽廖长君
Owner SOUTH CHINA UNIV OF TECH
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