Goaf acid wastewater treatment structure and method

Abstract

A goaf acid wastewater treatment structure comprises a first-stage filtering structure which is arranged at the position of an opening of a coal mine goaf, a permeable reactive barrier is arranged on the first-stage filtering structure, and zero-valent iron is arranged in the permeable reactive barrier and used for reducing the valence state of heavy metal in acid wastewater or degrading organic matter; the second-stage filtering structure is arranged on the water outlet side of the first-stage filtering structure, and the second-stage filtering structure comprises an alkaline filtering tank and is used for neutralizing the acid wastewater; the third-stage filtering structure is arranged on the water outlet side of the second-stage filtering structure, and a river channel is arranged on the water outlet side of the third-stage filtering structure; the three-stage filtering structure comprises a purifying pond and a plant cultivation plate arranged on the purifying pond, and aquatic plants are cultivated on the plant cultivation plate. Through the first-stage filtering structure, the second-stage filtering structure and the third-stage filtering structure, acid wastewater is filtered and purified step by step and then discharged into a riverway in the natural environment after reaching the standard, and damage to the ecological environment around the goaf is reduced.

Description

technical field [0001] The invention belongs to the technical field of acid waste water, in particular to a structure and method for treating acid waste water in goaf. Background technique [0002] Guizhou is one of the provinces rich in coal resources in my country. The sulfur content in the coal mines in this area is close to or higher than 3%. During the mining process of coal mines, due to changes in the occurrence environment of sulfides contained in the coal-bearing strata, the Oxidation-reduction reaction, coupled with the fact that many coal mines in Guizhou are mainly small-scale coal mines, the mine water and coal grinding stones are discharged in disorder, and the mines after the exhaust gas are untreated, resulting in acid waste water from coal mines. When encountering rainy weather, Bring acidic wastewater into the natural ecological environment. [0003] After the coal seam is mined, the coal mine is in an oxidizing environment in contact with the air. After the...

AI Technical Summary

Problems solved by technology

However, the patent does not use a hierarchical treatment structure for water treatment, and the water treatment effect is not obvious

In addition, it is not convenient to replace the fillers in the internal buffer protection wall, iron powder permeable reaction wall, and biological medical stone permeable reaction wall after they are consumed.

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