Device and method for repairing groundwater polluted by hexavalent chromium with upflow prb technology

Abstract

The invention relates to a device for repairing hexavalent chromium-polluted groundwater by virtue of an up-flow PRB technology. A water pumping system comprises a water pumping well, a well tube and a submerged pump, wherein the well tube is arranged in the water pumping well, a sieve tube is arranged at the middle-lower part of the well tube, the submerged pump is arranged in the sieve tube, one end of a guide tube is connected and communicated with a water outlet of the submerged pump, and the other end of the guide tube stretches out of the well tube and is connected and communicated with a booster pump on the ground; and an outlet of the booster pump is connected with a water distribution main tube, a plurality of water distribution branch tubes are connected with the water distribution main tube, a filler box is provided with an adsorption filling layer and a reduction reaction filler layer from top down, the plurality of water distribution branch tubes are radially distributed on the lower part of the reduction reaction filler layer, a penetrable layer is arranged in an outer baffle, the filler box is arranged in the penetrable layer and surrounded by penetrable mediums in the penetrable layer, an upper cover plate is arranged at the top of the outer baffle, and an overflow channel is arranged between the top of the filler box and the upper cover plate. The device disclosed by the invention is capable of reducing construction difficulty and repair cost, facilitating replacement for a repair material, and increasing repair efficiency.

Description

technical field [0001] The invention relates to a device and a method for repairing groundwater polluted by hexavalent chromium with an upflow PRB technology, and belongs to the technical field of groundwater restoration. Background technique [0002] With the rapid development of social economy and the acceleration of industrialization, the problem of groundwater pollution is becoming more and more serious. Among them, the pollution of hexavalent chromium in groundwater has attracted special attention because of its significant harm. Hexavalent chromium is a "three-caused" pollutant that has been confirmed by research. It mainly forms as CrO4 in soil and groundwater. 2～ and HCrO 4～ Existing in other forms, such as soluble and easy to migrate, it is designated as one of the most harmful pollutants in the environment and must be effectively controlled. [0003] Currently, groundwater contaminated with hexavalent chromium is mainly repaired by two technologies, namely extrac...

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Problems solved by technology

When the permeability coefficient of the soil layer in the contaminated area to be repaired is small, the traditional PRB repair effect is relatively poor; at the same time, when the traditional PRB technology is used for large-scale groundwater restoration, it often requires large-scale excavation, which not only leads to construction Difficulty, increased repair costs, and it is also not conducive to the replacement of PRB reaction materials in the later stage

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