Acid mine waste water treating device

Abstract

The invention relates to an acid mine waste water treating device which comprises a permeable reaction well. A water distribution-collecting layer is arranged on the bottom of the reaction well in a paving mode. A mixed padding biochemical reaction and microbial fuel cell zone is in the middle of the reaction well. A microbial fuel cell and the reaction well are arranged in a concentric circle structure. A cathode of the microbial fuel cell is composed of a cylinder body defined by carbon cloth supported by a metal wire net. The position between the cylinder body and the wall of the reaction well is filled with biomass for immobilizing sulfate reducing bacteria and large-ceramsite mixed padding. The inner portion of the cylinder body is filled with municipal sewage plant activated sludge to be used as an anode zone. A carbon rod is used as an anode to be inserted into sludge. A bleeding filtering layer is arranged on the upper portion of the reaction well in a paving mode. The cathode and the anode are guided out through lead wires and are externally connected with a resistor to form a complete electric loop. The treating device can treat acid mine waste water in a home position, the pH of acid mine waste water can be adjusted to be larger than or equal to six effectively, and heavy metal ion concentration is effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a treatment device for acid mine wastewater. Background technique [0002] Acidic Mine Drainage (AMD) pollution from metal mines, high-sulfur coal mines, and tailings dams is a worldwide problem. AMD has low pH, high acidity, high heavy metal ion concentration, and a large amount of sulfate. Therefore, AMD is very harmful. It will corrode metal equipment, pollute surface water and groundwater, cause soil acidification and salinization, and heavy metals in wastewater will enter the human body through the food chain, endangering human health. [0003] At present, the main methods for treating acid mine wastewater include constructed wetland method, continuous alkali production system (SAPS), sulfate-reducing bacteria biochemical treatment method, and permeable reaction wall (PRB) for in-situ treatment. However, the alkaline method has secondary pollution; the constructed ...

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Problems solved by technology

However, the alkaline method has secondary pollution; the constructed wetland method requires a large area of ​​wetland; the optimum pH for the biochemical treatment of sulfate-reducing bacteria is 7, the effect of pretreatment to adjust the pH is poor, and the tolerance of sulfate-reducing bacteria to heavy metal ions is poor; the permeable reaction Most of the walls are difficult to regenerate, easy to block, short life, difficult to control the quality of effluent, and cannot meet the treatment requirements

In-situ treatment of acid mine wastewater technology needs to be perfected

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