Volatile organic compound contaminated groundwater restoration method

Abstract

The present invention discloses a volatile organic compound contaminated groundwater restoration method, wherein a stripping-resin adsorption combination process is adopted to remove volatile organic compounds in groundwater. The method comprises the following steps that: (1) contaminated groundwater is extracted and filtered, and then enters a stripping tower from the top, such that the volatile organic compounds in the groundwater enter a gas phase; (2) stripping gas discharged from the top of the tower is collected through a top gas collector, and then is introduced into a gas phase adsorption column filled with an adsorption resin to carry out an adsorption treatment; (3) at a room temperature, the stripped groundwater in the step (1) is introduced in a liquid phase adsorption column filled with an adsorption resin to carry out a treatment; (4) recharging the treated groundwater in the step (3) to the groundwater layer; and (5) regenerating the adsorption resins in the step (2) and the step (3) by using a desorption agent, wherein the adsorption resins are subjected to adsorption penetrating. According to the present invention, the stripping-resin adsorption combination process is adopted to remove volatile organic compounds in groundwater, a new groundwater ectopy restoration technology is provided, and the restoration method provides high removal effects for various volatile organic compounds in the extracted groundwater.

Description

technical field [0001] The invention relates to a restoration method for groundwater polluted by volatile organic compounds. Background technique [0002] The rapid development of our country's economy has made the groundwater pollution more and more serious. Among them, organic pollution has become the main form of groundwater pollution, especially in some developed urban areas. At present, the typical groundwater pollution remediation technologies in foreign countries mainly include the following three types: extraction-treatment method (P&T), monitoring natural attenuation technology and in-situ remediation technology. Among them, the extraction-treatment method (P&T) is the most commonly used traditional ex-situ remediation technology. Since the groundwater pollution remediation was carried out in the 1980s, the P&T technology is still the main method of groundwater pollution control. According to the scope of groundwater pollution, a certain number of pumping wells are...

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Problems solved by technology

[0004] A large number of researches and engineering examples at home and abroad have shown that activated carbon adsorbents have difficulty in regeneration and poor mechanical properties. When activated carbon adsorption is used to treat high VOCs polluted groundwater alone, the amount of adsorbent is large and the repair cost is too high. The existence of hydrophilic groups such as hydroxyl and carbonyl leads to the disadvantage of poor adsorption capacity for volatile organic compounds under high humidity conditions

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