Serial connection progressive underground water heavy metal pollution in-situ restoration system and restoration method

Abstract

The invention provides a serial connection progressive underground water heavy metal pollution in-situ restoration system. According to the underground water flowing direction, one row of water extraction well group is arranged in parallel in a direction vertical to the underground water flow direction in the boundary position of the downstream of a pollution plume; a plurality of rows of recharging well groups are arranged in parallel at the upper stream of the water extraction well group corresponding to the water extraction well group; one row of recharging well groups at the uppermost stream is arranged outside a pollution source; a restoration reaction region is arranged between recharging wells of each row of recharging well groups and the recharging wells of the adjacent recharging well groups; outlet water treated by the restoration reaction region flows into the recharging well of the row of recharging well groups through a pipeline; active materials taking a reaction with heavy metals are filled in the restoration reaction region; modified zeolite is filled in a recharging well head; a water quality sensor is arranged in each well with a water extraction pump and is connected with a PLC (programmable logic controller); the starting and the stopping of the water extraction pump are automatically controlled. The invention also discloses an underground water restoration method.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated groundwater, and in particular relates to a series progressive multi-stage quasi-in-situ remediation system for heavy metal pollution in groundwater. [0002] The invention also relates to a method for groundwater remediation using the system described above. Background technique [0003] With the rapid development of industry and agriculture, the pollution of heavy metals in groundwater has intensified, and the pollution situation has become increasingly severe. In particular, industrial wastewater, waste residues, heavy metal-containing pesticides, and chemical fertilizers have caused heavy metal pollution in groundwater, and most northern regions use groundwater as drinking water. Therefore, it is urgent to control groundwater pollution caused by heavy metals to ensure drinking water safety. [0004] At present, the remediation technologies of heavy metal pollution in gro...

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Problems solved by technology

In contrast, the ectopic remediation technology has the characteristics of short repair period, good effect, mature technical methods, and easy maintenance of the ground remediation device, but its tailing and rebound will affect the removal effect of pollutants; in situ remediation technology It has the advantages of low operating cost and little disturbance to the stratum structure, but it is difficult to construct in areas with deep groundwater

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