In-situ injection-extraction-water replenishing circulatory disposal system for organic contaminated soil and groundwater and combined remediation method

Abstract

The invention discloses an in-situ injection-extraction-water replenishing circulatory disposal system for organic contaminated soil and groundwater and a combined remediation method. The system is consist of an injection well, an extraction well, a water replenishing well, a water treatment facility, a dispensing facility. The method comprises the following steps: extracting a pollution source or groundwater in a seriously polluted area to the ground for processing, then using the processed groundwater as a preparation drug or as replenished water to be directly injected to the underground, and injecting the drug into the underground pollution plume area through the injection well. The system and the method are used for processing the organic contaminated soil and groundwater in situ and have the advantages of being small in disturbance, environmental-friendly, short in remediation cycle and wide in range of application and has no secondary pollution.

Description

technical field [0001] The invention relates to an in-situ injection-extraction-hydration cycle disposal system and a combined repair method for organic matter polluted soil and groundwater. Background technique [0002] Soil and groundwater are the basic environmental elements that constitute the natural ecosystem and the material basis for the survival and development of human beings. With the intensification of industrial pollution and the widespread use of agricultural chemicals, especially after the relocation of polluting factories such as chemicals, medicines, and pesticides around the city, a large number of abandoned sites have been left. The underground soil and groundwater of these sites are often polluted by organic matter, and the presence of pollutants in the soil and groundwater environment may have serious adverse effects on nearby human bodies and the surrounding environment, and may endanger human life in severe cases. In April 2004, during the constructio...

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Problems solved by technology

In addition, general polluted sites do not have weak foundations, especially industrial polluted sites generally have hardened ground and pond slag foundations, which cannot be operated with plug-in machines

Therefore, the feasibility of this patent is relatively poor

[0007]The in-situ remediation technology of soil and groundwater is a commonly used remediation method in the prior art. It has the advantages of convenient operation, low cost and wide application range. It mainly uses infiltration Adsorption media with a high coefficient can treat organic pollutants in groundwater by chemical or physical means, while currently known treatment media such as zeolite, activated carbon, and composite fillers are not effective in treating organic pollutants, especially refractory organic pollutants. Pollutants cannot be fully decomposed, and the removal efficiency is low; and in-situ restoration also faces the shortcomings of low restoration efficiency and long cycle, and there is also the risk of chemical restoration agent contamination

[0008] Ex-situ remediation of soil and groundwater has a wide range of applications, flexible and convenient treatment process, good treatment effect, short treatment cycle, and specific treatment can be adopted for specific pollutants technology, highly targeted; however, long-term and large-flow pumping of groundwater is likely to cause land subsidence, and the cost of off-site restoration is high, making it difficult to apply on a large scale

[0009] Ectopic-in-situ repair technology is currently less used, and the above-mentioned combination methods are rarely studied in the prior art, and the currently known combined repair methods are also There is a problem that the design process fails to reflect the cooperation of the two, and the design scheme is only a simple superposition of the two, and the actual treatment effect fails to achieve the goal of 1+1>2;

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