Sponge type permeable reactive barrier system

Abstract

The invention discloses a sponge type permeable reactive barrier system which is applied to treatment on tailing percolate pollution and comprises a sponge reservoir, a sunk green belt, a permeable reactive barrier, a detection zone and a water pump, wherein the sunk green belt is arranged at the downstream of tailings; the sponge reservoir is arranged right below the sunk green belt; the permeable reactive barrier is arranged at the downstream of the sponge reservoir. Due to adoption of the sponge reservoir at the downstream of the permeable reactive barrier, large-flow percolate can be stored and buffered, and the load of the percolate to the permeable reactive barrier is buffered; a water body inside the sponge reservoir is compulsively circulated through the water pump, and then sudden high-concentration harmful substance percolate can be diluted; by flowing back a water body of which the concentration exceeds standards inside the detection zone, the sewage treatment performance is improved. The sponge type permeable reactive barrier system is capable of effectively treating water body pollution such as tailing percolate and is low in operation maintenance cost and long in treatment action time.

Description

technical field [0001] The invention relates to the technical field of underground sewage treatment, in particular to a sponge-type permeable reaction wall treatment system for tailings leachate. Background technique [0002] my country is rich in mineral resources, but the ore composition is complex and there are few single mines. Ore needs to go through a series of sorting operations to obtain concentrates, resulting in low comprehensive utilization of minerals and serious waste of resources. The remaining components after sorting are discharged in the form of slurry to form tailings. Tailings contain a large amount of metal minerals and non-metallic minerals, which will undergo complex reactions under the action of rain, light, and microorganisms. The heavy metal ions contained in the tailings leachate will not only endanger the surrounding groundwater and surface water, but also affect the surrounding areas. Soil can also cause serious pollution. [0003] At present, t...

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Problems solved by technology

[0003] At present, there are mainly the following methods to deal with tailings leachate: 1. Physical shielding method, which uses the sealing method to enclose the polluted water and prevent it from spreading out. This method has a narrow range of application

2. Extraction treatment method, which is a method of pumping sewage out of the ground for treatment. This method has high investment costs and is difficult to treat large-scale polluted water

3. In-situ treatment method, which uses biology and permeable reaction wall (PRB) to treat underground polluted water. The input cost of the two methods is relatively low, and the bioremediation method is easily affected by the environment and is not conducive to treatment.

However, this technology is not effective in treating the high-concentration and large-flow leachate produced by heavy rain, especially in tailing mines. When the rain comes, the leachate is discharged in large quantities and contains high-concentration harmful substances. The leachate flow exceeds the load of the permeable reaction wall. Spills, spilled leachate can still contaminate groundwater

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