River basin rare earth mine tail water treatment system and river basin rare earth mine tail water treatment process

Abstract

The invention relates to a river basin rare earth mine tail water treatment system and a river basin rare earth mine tail water treatment process. Aiming at the characteristics that rare earth mine tail water is a natural environment water yield and fluctuation of pollutant concentration is relatively large, the system has three operating modes: a normal operating mode, a wet season operating modeand a dry season operating mode. An emergency treatment unit is additionally arranged at the tail end. Ammonia nitrogen and total nitrogen exceed standards when a nitrification-denitrification coupled biological membrane filter system A, a carbon source pond, an adjusting pond B and a nitrification-denitrification coupled biological membrane filter system B go wrong and influent concentration andinfluent flow exceed a designed load or extreme environments such as ultra-low temperature (the water temperature is lower than 5 DEG C) and the like. Due to the addition of chemical reagents such assodium hypochlorite into the emergency reaction pond, a breakpoint chlorination reaction is carried out to remove ammonia nitrogen and total nitrogen, so that effluent reaches the standard stably.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a tail water treatment system and a treatment process of basin-based rare earth mines. Background technique [0002] Rare earth mine tail water is a rare earth in-situ leaching mining process due to leaching liquid (NH4) 2 SO 4 The solution leaks into the groundwater and then collects into the surface water of the small watershed in the mining area to produce a type of tail water. Its salient features are: (1) The main pollutants are ammonia nitrogen and nitrate nitrogen, and the content of ammonia nitrogen and nitrate nitrogen is high. According to The amount of water in different river basins and the distance from the mining area are different. The concentration range of ammonia nitrogen is 40mg / L-200mg / L, and the concentration range of nitrate nitrogen is 20mg / L-40mg / L; (2) The organic carbon content is very low, basically It does not contain phosphorus and has poor...

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Problems solved by technology

[0005] Over the years, more than 10 universities, scientific research institutes and enterprises have proposed their own tail water treatment schemes for in-situ leaching rare earth mining areas, but most of the schemes are not very applicable

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