Polluted groundwater in-situ remediation technology

Abstract

The invention relates to an in-situ purification technology which can be used for reductive dechlorination, heavy metal precipitation and microbial denitrification reaction. The in-situ purification technology requires an anaerobic reaction area used for precipitating and filtering soluble heavy metal, such as metal sulfide and nitrate which are converted to nitrogen, precipitates and filtered chromium. A pump process system is composed of one or more wells which extend to an underground pollution saturated zone. There are conduits in the wells, and the conduits are used for conveying carbohydrate and sulfate to the pollution saturated zone. In a reaction zone, dissolved state oxygen content is lower than 0.5mg / L, redox potential is lower than -250mv, and the ratio of soluble organic carbon compounds to pollutants is higher than 50:1. Meanwhile, microbes digest carbohydrate, sulfate can be reduced and methane can be generated. In this biogeochemical environment, PCE dechlorination can be caused for reduction to obtain TCE, TCE further undergoes dechlorination to generate DCE, dechlorination is carried out again to generate VE, and ethene is finally generated. Meanwhile, heavy metal precipitation and microbial denitrification reaction are also caused in the biogeochemical environment.

Description

technical field [0001] The invention mainly relates to an in-situ purification process technology for soluble groundwater pollutants, and is especially suitable for purifying soluble pollutants in groundwater in in-situ anaerobic areas. Background technique [0002] The management of groundwater containing harmful pollutants is a very serious problem at present. These harmful substances spilled or leaked from the storage equipment, or the harmful pollutants discharged on the surface, seep into the groundwater, seriously pollute the groundwater, and are a serious threat to drinking water. Compared with surface water, although groundwater is not easily polluted, once polluted, the purification of pollutants will be very difficult and time-consuming. The recovery and purification of polluted groundwater is not very effective with existing technologies. For example, pumping groundwater from the saturated zone, and then discharging it back to the saturated zone after purifi...

AI Technical Summary

Problems solved by technology

Compared with surface water, although groundwater is not easily polluted, once it is polluted, it will be very difficult and time-consuming to purify pollutants.

Recovery and purification of polluted groundwater is not very effective with existing technologies

For example, pumping groundwater from the saturated zone, and then discharging it back to the saturated zone after purification, the whole process costs a lot, and pumping the groundwater to the surface may easily cause heavy metals and other pollutants in the groundwater to harm the local area

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