Device and method for repairing chromium contaminated underground water through electromotive force

Abstract

The invention belongs to the field of underground water pollution repair, and particularly relates to a device and a method for repairing chromium contaminated underground water through electromotive force. The device comprises a water feeding system, a main body reaction system and a water discharging system which are sequentially connected; contaminated underground water enters the main body reaction system through a hydraulic system and is subjected to organic acid reinforced electromotive force treatment; simulated contaminated dynamic underground water generates hydraulic gradient in a reaction region through a water level difference between overflowing water tanks at two sides so that the flow rate is controlled; after entering the reaction region, the chromium contaminated underground water stands, then serves as an electrolyte to pass through the reaction region and is mixed with a citric acid solution, chromium ions in the contaminated underground water are ceaselessly desorbed out from the underground water in the repairing process under the effect of constant direct currents and are removed from the underground water under the effect of electric field force, so that the treatment of the chromium contaminated underground is realized. The technology of the device has the characteristics of high heavy metal removal rate of above 95%, no secondary pollution, easiness in pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution restoration, in particular to an electrodynamic restoration device and restoration method for chromium-contaminated groundwater. Background technique [0002] Groundwater is an important part of the natural water cycle and is closely related to human activities and survival. With the development of production, the problem of heavy metal pollution in groundwater is becoming more and more serious, which has become one of the most urgent environmental pollution problems faced by human beings. In the evaluation of the groundwater quality in 118 cities across the country, 64% of the urban groundwater is seriously polluted, 33% of the urban groundwater is slightly polluted, and only 3% of the urban groundwater is basically clean, and the chromium pollution in the groundwater is particularly noticeable. . Groundwater exists in soil voids and underground rock fissures. Due to the complex p...

AI Technical Summary

Problems solved by technology

[0009] At the same time, electric restoration technology also has some limitations: ①It is not suitable for restorations with low water content, and the effect becomes worse when the water content is below 10%; ②Due to the composition difference of the same restoration, the local minerals are high and the electrical conductivity is good , resulting in abnormal current, which may also affect the original properties of the restoration; ③ electrolytic reaction produces secondary pollutants, such as redox reaction to produce by-product chlorine, etc.; ④ corrosion problems, such as carbon, graphite, platinum and other electrodes remaining in the restoration after corrosion in the body

However, the impact of the application of organic acids on electroosmotic flow is also worthy of attention, because excessive use of organic acids will also increase the anion of the restoration and reduce the Zeta potential, directly affecting the magnitude and even direction of electroosmotic flow

Images