Biological PRB (permeable reactive barrier) system for underground in-situ remediation of coal mine acid wastewater

Abstract

The invention relates to a biological PRB (permeable reactive barrier) system for underground in-situ remediation of coal mine acid wastewater, and belongs to the technical field of water pollution control. The system comprises a water inlet groove, a biological PRB body and a water outlet tank, wherein the water inlet groove is higher than the goaf ground for 0.3-0.5 m; the biological PRB body adopts a four-layer structure, and sequentially consists of a buffer protecting barrier, a ferrous powder PRB, a biological medical stone PRB and a buffer protecting barrier; the water outlet tank adopts the sectional separating plate type, so as to ensure that the interior of the biological PRB is always in the water filling anaerobic state in the running process of system. The system is arranged on the coal mine goaf, and the defects of land occupation during ground treatment, pollution to environments, laying of long-distance conveying pipelines and the like are overcome. The system has the advantages that the structure is simple, the cost is low, the safety is realized, the efficiency is high, and the manned watching is not required in the running process. On the basis of the traditional PRB, the novel PRB with biological strengthening function is established in the method that the medical stone is fixed and mixed with sulfate reducing bacteria.

Description

technical field [0001] The invention belongs to the technical field of water pollution control engineering, and in particular relates to a biologically permeable reaction wall system for underground in-situ restoration of coal mine acid wastewater. Background technique [0002] Permeable reactive barrier (PRB for short) is a new method emerging in many developed countries such as Europe and the United States for in-situ removal of polluted components in groundwater and soil. "PRB Technology for Pollutant Remediation" issued by the US Environmental Protection Agency (USEPA) in 1998 defines PRB as: an active material wall is placed underneath to intercept the pollution plume, and after the plume passes through the reaction medium, the pollutants can be released. Transform into another form acceptable to the environment, so as to achieve the goal of making the concentration of pollutants meet the environmental standards. The in-situ treatment of coal mine acid wastewater by P...

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Problems solved by technology

[0005] The present invention aims at the characteristics of high-iron-manganese sulfate containing ammonia nitrogen and low pH and COD in coal mine acid waste water, and aims at the problems that traditional PRB is easy to block, the treatment effect is not good, and sulfate-reducing bacteria are easily inhibited by low pH and high-concentration heavy metals. Coupling of mixed sulfate-reducing bacteria and PRB technology to construct a biopermeable reaction wall system for in-situ remediation of coal mine acid wastewater

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