In-situ oxidation circulation extraction remediation system and remediation method for organic contaminated underground water

Abstract

The invention belongs to the field of groundwater pollution remediation. A purpose of the invention is to provide an in-situ oxidation circulation extraction remediation system and a remediation method for organic contaminated underground water. According to the system and the method, the real-time monitoring and evaluation of the in-situ oxidation remediation effect of organic polluted underground water can be realized, the agent adding frequency is effectively guided, the secondary pollution risk is reduced, the agent cost is saved, and the construction period is shortened. According to thetechnical scheme, the in-situ oxidation circulation extraction remediation system for organic polluted underground water comprises an in-situ oxidation system, a circulation extraction system and a monitoring system, wherein the circulation extraction system comprises an extraction well arranged in an organic pollution area, an injection well arranged around the extraction well, at least an extraction pump arranged in the extraction well, at least an extraction pipe extending into the extraction well and communicated with the extraction pump, and a circulation injection pipe extending into theinjection well and communicated with the extraction pipe.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and in particular relates to an in-situ oxidation cycle extraction restoration system for organically polluted groundwater and a method for repairing organically polluted groundwater by using the system. Background technique [0002] At present, there are many remediation methods for contaminated groundwater at home and abroad, including extraction treatment, in-situ chemical oxidation, in-situ aeration, permeable reaction walls, in-situ bioremediation and other methods. Compared with other remediation technologies, extraction treatment remediation technology and in-situ chemical oxidation remediation technology are widely used in groundwater remediation and treatment due to their advantages such as short remediation period, significant remediation effect, and low operation and maintenance costs. [0003] For example, the patent with the publication number CN106277386B relates t...

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Problems solved by technology

[0003] For example, the patent with the publication number CN106277386B relates to a circulating controllable groundwater pollution multi-stage intensified repair system, which consists of a pumping unit, a water injection well group, a polluted multi-stage intensified disposal unit and an automatic control device. The pollution on the ground is discharged into the injection well group after the multi-stage enhanced treatment unit reaches the standard, but it is often difficult to overcome the "tailing phenomenon" and "rebound phenomenon" of pollutants in groundwater, which makes it difficult to completely remove pollutants in groundwater

[0004] For example, the patent with the publication number CN104438315A relates to an in-situ oxidation repair system for groundwater, which generally includes a medicament configuration system, a medicament injection system, and a monitoring system, but there are the following problems: (pH, redox potential, conductivity, dissolved oxygen, turbidity, etc.), lack of online monitoring and evaluation of in-situ oxidation reaction status of groundwater, which may increase the risk of secondary pollution of groundwater due to excessive dosage of chemicals, or Insufficient dosing leads to delays in the construction period; on the other hand, the hydrogeological conditions of the general site are complex, and after the oxidizing agent is injected into the injection well, due to the lack of human interference, it only diffuses by virtue of the hydraulic gradient of the groundwater itself, and the influence radius of the agent diffusion is limited. As a result, the chemical and the pollutants cannot fully contact and react, and the pollutants are difficult to completely remove

[0005] For example, the patent with the publication number CN101021520A relates to a soil field test and in-situ restoration device and its system. Chromatography is used to determine the changing trend of microbial respiration of CO2 in wells, but the investment and operation and maintenance costs of gas chromatography instruments are high and the operating conditions are harsh

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