In-situ remediation technology of low-concentration organic polluted underground water and application of in-situ remediation technology

Abstract

The invention discloses an in-situ remediation technology of low-concentration organic polluted underground water. The technology comprises the steps as follows: an injection well is constructed in aunderground water polluted area, a well pipe is mounted in the injection well, and a hole is punched in the bottom of the well pipe and communicated with a water containing layer, wherein the length of the hole is larger than the longitudinal range of the polluted area; oxygen is injected into the water containing layer through the injection well to perform aerobic control on the water containinglayer; after anaerobic control is performed on the water containing layer for 5 days or longer, aerobic control and anaerobic control are circulated until degradation of organic pollutants in the underground water reaches the standard. The dissolved oxygen content of the underground water is manually adjusted, ordered alternation of aerobic and anaerobic conditions is controlled, and oxidative degradation of low-concentration organic pollutants by hydroxyl radicals produced by oxygen under activation of ferrous iron minerals under the aerobic condition and regeneration of ferrous iron mineralsby microorganisms by means of organic carbon under the anaerobic condition are realized by using inherent components such as iron minerals, organic matter and microorganisms in the water containing layer.

Description

technical field [0001] The invention relates to the field of groundwater treatment, in particular to an in-situ restoration process for low-concentration organic-polluted groundwater and its application. Background technique [0002] Groundwater is an important source of water supply, and drinking water and agricultural irrigation water in most parts of the world come from groundwater. There are different degrees of hydraulic connections between groundwater and surface water bodies such as rivers and lakes, and the quality of groundwater directly affects the environmental quality of surface water. At the same time, groundwater is also the main source of water for ecological environments such as wetlands and vegetation, and has a very important impact on the quality of the ecological environment. However, groundwater pollution is very serious. In groundwater pollution, the pollution of groundwater by small-area sites characterized by source pollution has received high atten...

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Problems solved by technology

[0004] However, the above in-situ remediation technologies for groundwater have the following problems when dealing with low-concentration organic pollutants: (1) It is impossible to efficiently and economically treat low-concentration organic pollutants up to the standard

The above technologies can usually efficiently and economically reduce medium and high concentrations of organic pollutants to a very low level, but it will be very difficult and costly to further reduce them below the standard value

(2) The processing principle is relatively simple

The principle of existing remediation technology to remove pollutants is either oxidation or reduction, which is more effective for pollutants that can be oxidized or reduced, but not for many organic pollutants that cannot be completely degraded and detoxified by oxidation or reduction. Does not work, such as nitro compounds, etc.

(3) Insufficient utilization of the inherent components of the aquifer

Ferrous iron minerals in the aquifer have the function of activating oxygen to generate hydroxyl radicals to degrade organic pollutants, and microorganisms can use organic matter to reduce ferric iron to regenerate ferrous iron after oxygen is exhausted, but such a natural process has not been used effectively

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