In situ perfusion method for remediation of organic contaminated groundwater

Abstract

The invention relates to an in situ perfusion method for remediation of organic contaminated groundwater. The method includes: opening an extraction valve and a by-pass valve, starting an extraction pump, and conveying contaminated groundwater in an extraction well into a reagent preparation tank through an extraction pipeline; starting a stirrer in the medicament preparation tank, adding a reagent into the reagent preparation tank and stirring the reagent with groundwater evenly to obtain a remediation reagent; opening a reagent perfusion valve and a reagent perfusion pump, injecting the remediation reagent into perfusion wells through a circulating water pipeline and perfusion pipelines; closing the reagent perfusion valve and the reagent perfusion pump, starting the extraction pump and injecting the groundwater in the extraction well into respective perfusion wells through the circulating water pipeline and the perfusion pipelines, and circulating the water power between the extraction well and the perfusion wells; starting a self-priming jet pump on a sampling pipeline, collecting the groundwater in a monitoring well, detecting the redox potential of groundwater and organic pollutant removal rate, and ending remediation until the groundwater is detected to be qualified. The method provided by the invention saves remediation time and cost, and improves the remediation effect.

Description

technical field [0001] The invention relates to an in-situ pouring method for remediating organically polluted groundwater, and belongs to the technical field of remediating organically polluted groundwater. Background technique [0002] As a precious fresh water resource, groundwater has been polluted more and more with the continuous development of industrialization in modern society. In my country, the latest survey results show that groundwater pollution, especially organic pollution, is not only gradually expanding, but also deepening year by year. Into the groundwater, a huge threat to human health. [0003] At present, the remediation of organic pollution in groundwater mainly adopts ectopic remediation technology, which extracts organically polluted groundwater to the ground surface, adds oxidants or filters through adsorption to reduce the content of organic pollutants in groundwater. In the short term, this The treatment efficiency of this method is relatively hig...

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Problems solved by technology

[0003] At present, the remediation of organic pollution in groundwater mainly adopts ectopic remediation technology, which extracts organically polluted groundwater to the ground surface, adds oxidants or filters through adsorption to reduce the content of organic pollutants in groundwater. In the short term, this The treatment efficiency of this method is relatively high, and the treatment capacity is relatively large, but the groundwater and the soil are a whole that coexists. Due to the adsorption of the soil, some organic pollutants in the groundwater will adhere to the soil surface and cannot be extracted simultaneously with the groundwater. After a period of After a period of time, this part of the pollutants will be re-analyzed into the groundwater to cause secondary pollution, which is not conducive to the restoration.

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