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Method for in-situ bioremediation of pollution caused by chlorohydrocarbon of underwater

A groundwater pollution and bioremediation technology, applied to water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve low cost, overcome the generation of toxic intermediate products, and maintain safety

Inactive Publication Date: 2013-03-20
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, both anaerobic reductive dechlorination and aerobic oxidative degradation have their own limitations

Method used

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  • Method for in-situ bioremediation of pollution caused by chlorohydrocarbon of underwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The groundwater at the former site of a factory relocation was polluted by leakage of chlorinated solvents. The length of the pollution plume was 300m, the width was 60m, the groundwater flow rate was 5m / d, and the groundwater level was 6m. The contents of various pollutants in the pollution plume are listed in Table 1.

[0048] Table 1 List of pollutants

[0049] Pollutants

[0050] Such as figure 1 As shown, according to the preliminary survey of the polluted area, the anaerobic remediation area is defined within the range of 150m to 200m from the pollution source in the pollution plume, and the aerobic remediation area is defined within the range of 200m to 250m. In the anaerobic remediation area, 24 drug injection wells and 12 monitoring wells are drilled along the width direction at a distance of 5m, with a depth of 8-15m. The injection agent is a mixed suspension solution of seaweed powder, iron powder and sodium bisulfite with a solid content of 5%. I...

Embodiment 2

[0052] An air force base maintenance plant used a large amount of trichlorethylene as a degreasing agent for a long time in the process of parts processing and modification, and trichlorethylene pollution was detected in the groundwater near the maintenance plant, with a concentration as high as 15.9mg / L. After delineating the anaerobic remediation area and aerobic remediation area within the pollution plume, establish several chemical injection wells, monitoring wells, and aeration wells.

[0053] The composition of the injection agent is a suspension of sucrose, nano-zero-valent iron, and sodium bisulfite with a water content of 80%. In the dry component, sucrose accounts for 40%, nano-zero-valent iron accounts for 50%, and sodium bisulfite accounts for 10%. %. The aeration rate was controlled at about 50mL / min, and after 6 months, the trichlorethylene in the groundwater dropped below 5μg / L, reaching the drinking water standard.

Embodiment 3

[0055] A leakage incident occurred in the tetrachlorethylene storage tank of a factory. After the surface cleaning was completed, it was found that tetrachlorethylene appeared in the groundwater with a concentration of 10mg / L. The contaminated area is about 5m long and 1.6m wide. An anaerobic reaction zone is established centering on the pollution source area. Due to the small pollution area, the dissolved oxygen in the surrounding groundwater can naturally form an aerobic reaction zone.

[0056] The composition of the injection agent is a mixture of vegetable oil with a water content of 70%, sodium dithionite, and nano-zinc powder. In the components, vegetable oil accounts for 50%, sodium dithionite accounts for 20%, and nano-zinc powder accounts for 30%. Three months later, the content of tetrachlorethylene in groundwater dropped below 10 μg / L.

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Abstract

The invention discloses a method for in-situ bioremediation of pollution caused by chlorohydrocarbon of underwater, which specifically comprises a coupling process of anaerobic reductive dechlorination and aerobiotic oxydative degradation. An anaerobic reaction area and an aerobiotic reaction area are established in the front and back of a chlorohydrocarbon pollution area along the flowing direction of underwater in a zone of saturation. Poly-chlorohydrocarbon (trichloro or tetrachloro) in the anaerobic reaction area is quickly reduced and dechlorinated to low chlorohydrocarbon (monochloro or bichloro), the low chlorohydrocarbon is transferred to the aerobiotic reaction area and oxidized and degraded to products such as carbon dioxide. The anaerobic reaction area is realized by providing electron donor materials, a deoxidant and a reducer through the injection of an injection well, while the aerobiotic area is realized by aeration toward underground water.

Description

technical field [0001] The invention belongs to the technical field of groundwater restoration, and relates to a method for in-situ biological restoration of groundwater chlorinated hydrocarbon pollution. Background technique [0002] Chlorinated hydrocarbons are widely used in aircraft engines, auto parts, electronic components, and degreasing of clothes. In the 1980s, due to the leakage of chlorinated hydrocarbons and the underground environmental pollution caused by improper discharge, people have paid attention to them. The names of chlorinated hydrocarbons such as TCE began to appear frequently in various reports as groundwater pollutants. Chlorinated hydrocarbons have a strong carcinogenic effect, which poses a serious threat to people's healthy life and even survival. Chlorinated hydrocarbons belong to the heavy non-aqueous phase fluid (DNAPL), which are slightly soluble in water. After entering the underground environment, under the action of gravity, they will pass...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/36
Inventor 张景辉刘朝辉宋震宇杨伟李野王文茜卢丹王尧西伟力王旭东
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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