Restoration system and method for volatile organic compounds in underground water

Abstract

The invention discloses a restoration system and a method for volatile organic compounds in underground water. The system comprises an extraction injection well, an extraction mechanism, a gas-liquidseparation mechanism, a biological aerated filter, a detection water tank and a pumpback mechanism; the extraction injection well is built in a polluted site; a water inlet of the extraction mechanismis formed in polluted underground water in the extraction injection well; a water outlet of the extraction mechanism is communicated with a water inlet of the gas-liquid separation mechanism; a wateroutlet and a gas outlet of the gas-liquid separation mechanism are respectively communicated with a water inlet in the upper part and a gas inlet in the lower part of the biological aerated filter through pipelines; a water outlet of the biological aerated filter is communicated with a water inlet of the detection water tank through a pipeline; an air outlet is formed in the top of the biologicalaerated filter; a water inlet of the pumpback mechanism is communicated with the bottom of the inner cavity of the detection water tank; and a water outlet of the pumpback mechanism is communicated with a water return port in the middle of the biological aerated filter. The system can be repeatedly used for a long time, the bioremediation technology is low in cost, the system operation is simple,the secondary pollution degree in the remediation process is low, and the environmental risk is small.

Description

technical field [0001] The invention relates to a recovery system and a recovery method for volatile organic compounds in groundwater. Background technique [0002] In my country, groundwater accounts for 1 / 3 of the total fresh water content in the country, and it is the main source of domestic and production water in cities and drinking water in some rural areas. Groundwater is an important water resource in my country. However, with the rapid economic development, activities such as industrial and agricultural production have had an impact on groundwater, in which volatile organic compounds (VOCs) pollution is particularly prevalent. [0003] At present, the remediation methods of VOCs in groundwater in engineering mainly include thermal desorption, chemical oxidation and multiphase extraction and other remediation technologies. Chinese patent document CN206599492U discloses a treatment and recovery system for volatile organic pollutants in soil and groundwater. The steam...

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Problems solved by technology

Chinese patent document CN206599492U discloses a treatment and recovery system for volatile organic pollutants in soil and groundwater. The steam generated by the factory is used to inject the repaired area in situ, and the volatilized organic pollutants are collected by raising the temperature. The flow system process is more complex, the construction and operation costs are higher, and the polluted site must be an industrial enterprise in production

Chinese patent document CN103864263B discloses a circulation well system for volatile organic compounds in groundwater with wider applicability. The system directly feeds gas aeration into the water in the inner well, and sprays chemicals through the outer well to restore the groundwater. However, this system The chemicals used in the process may cause secondary pollution

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