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In-situ remediation agent for underground water chlorinated hydrocarbon pollution, preparation method and application

A technology for in-situ remediation and remediation agents, which is applied in the restoration of polluted soil, water pollutants, and contaminated groundwater/leachate treatment, etc. Achieve the effect of accelerating rapid degradation, maintaining long-term activity and stability, and achieving rapid proliferation

Active Publication Date: 2022-05-13
森特土壌修復研究院(深せん)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to solve the problems of relatively high repair cost of existing compound agents and easy aggregation of zero-valent iron. The present invention provides an in-situ repair agent for groundwater chlorinated hydrocarbon pollution, and Method and application

Method used

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  • In-situ remediation agent for underground water chlorinated hydrocarbon pollution, preparation method and application
  • In-situ remediation agent for underground water chlorinated hydrocarbon pollution, preparation method and application
  • In-situ remediation agent for underground water chlorinated hydrocarbon pollution, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The laboratory weighed 35g of tap water, 10g of reusable oil, and 1g of emulsifier, mixed and stirred well, then added 41g of zero-valent iron powder with a particle size of 20um, 8g of biochar, and 0.1g of gum arabic powder, mixed well, and then added industrial 3g of syrup and 2g of corn stalk powder were mixed for 5 to 10 minutes at a stirring speed of 2000r / min to make a restoration agent slurry. The prepared restoration agent slurry is uniform and stable. The laboratory is equipped with 100mL of 2mg / L trichlorethylene (TCE) solution, and 5g of the prepared restoration agent is added under the protection of nitrogen. The effective iron powder content is 1.5%, and it is kept in a dark seal. Regularly measure changes in oxidation-reduction potential (ORP), dissolved oxygen (DO) and pH in water. The results showed that ORP dropped from -50mv to -350mV within 5 days, DO dropped below 0.4ppm, and the pH value was 7.35~7.46. The value remains at around 7.49. This shows ...

Embodiment 2

[0044] The laboratory weighed 35g of tap water, 15g of reusable oil, and 2g of emulsifier, mixed and stirred well, then added 20g of zero-valent iron powder with a particle size of 20um, 12.5g of biochar, and 0.5g of gum arabic powder, mixed well, and then added 5g of industrial syrup and 10g of corn stalk powder were mixed for 5-10min at a stirring speed of 2000r / min to make a restoration agent slurry. The prepared restoration agent slurry is uniform and stable. The laboratory is equipped with 100mL of 2mg / L trichlorethylene (TCE) solution, and 5g of the prepared restoration agent is added under nitrogen protection. The effective iron powder content is 1.5%, and it is sealed and kept in the dark. Regularly measure changes in oxidation-reduction potential (ORP), dissolved oxygen (DO) and pH in water. The results showed that ORP dropped from -50mv to -310mV within 5 days, DO dropped below 1ppm, and the pH value was 7.18-7.26. Maintained at around 7.62. This shows that the add...

Embodiment 3

[0046] The laboratory weighed 15g of tap water, 15g of reusable oil, and 2g of emulsifier, mixed and stirred well, then added 45g of zero-valent iron powder with a particle size of 50um, 8g of biochar, and 0.3g of gum arabic powder, mixed well, and then added industrial 5g of syrup and 9.7g of corn stalk powder were mixed for 5 to 10 minutes at a stirring speed of 2000r / min to prepare a restoration agent slurry. The prepared restoration agent slurry is uniform and stable. The laboratory is equipped with 100mL of 2mg / L trichlorethylene (TCE) solution, and 5g of the prepared compound agent is added under nitrogen protection. The effective iron powder content is 1.5%, and it is sealed and kept in the dark. Regularly measure changes in oxidation-reduction potential (ORP), dissolved oxygen (DO) and pH in water. The results showed that ORP dropped from -50mv to -270mV within 5 days, DO dropped below 1.2ppm, and the pH value was 7.21-7.43. The value remained at around 7.53. This sh...

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Abstract

The invention discloses an in-situ remediation agent for underground water chlorinated hydrocarbon pollution, a preparation method and application, the remediation agent comprises zero-valent iron powder, biochar, a biological carbon source, an emulsifier, a stabilizer and water, the biological carbon source comprises a short-acting carbon source, a medium-acting carbon source and a long-acting carbon source, and the remediation agent comprises the following components in percentage by weight: 20-45% of zero-valent iron powder, 8-15% of biochar, 5-10% of biological carbon source, 5-10% of emulsifier, 5-10% of stabilizer and the balance of water. The biological carbon source accounts for 15-35%, the emulsifier accounts for 1-3%, the stabilizer accounts for 0.1-0.5%, and the The method comprises the following steps: adding recyclable oil and an emulsifier into water, and fully emulsifying the recyclable oil and the emulsifier through low-speed stirring; sequentially adding the zero-valent iron powder, the biochar and the stabilizer, and stirring to uniformly mix; according to the method, industrial syrup and straw powder are added, mixing is conducted for 10-20 min at the stirring speed of 2000 r / min, remediation agent slurry is prepared, the remediation agent is injected into an underground water halogenated hydrocarbon polluted water layer at high pressure, in-situ water remediation can be achieved, efficiency is high, cost is low, and engineering application of chlorinated hydrocarbon polluted underground water is facilitated.

Description

technical field [0001] The invention relates to the technical field of in-situ groundwater remediation, in particular to an in-situ remediation agent for groundwater chlorinated hydrocarbon pollution, a production method and application. Background technique [0002] Chlorinated hydrocarbon solvents, including carbon tetrachloride, tetrachloroethylene, trichloroethylene, and trichloroethane, are among the most widely used cleaning and degreasing solvents in the world, and are also widely used in pharmaceuticals, textiles, coatings, and other chemical synthesis etc. Since early solvent wastes were directly disposed of on land without effective treatment, chlorinated solvents permeated into soil and groundwater. Groundwater is one of the sources of drinking water for human beings. The chlorinated hydrocarbons in the groundwater have the characteristics of various types, high hazards and difficult treatment. Chlorinated hydrocarbons enter the groundwater and are easy to accumu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34B09C1/00C02F1/00C02F1/28C02F1/70C02F101/36C02F103/06
CPCC02F1/283C02F1/288C02F1/705C02F3/34C02F1/00B09C1/002C02F2103/06C02F2101/36C02F2305/06B09C2101/00
Inventor 朱焰邹惠叶渊李彦希张文超刘晶晶王军军
Owner 森特土壌修復研究院(深せん)有限公司
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