Tail water treatment system and treatment process of a river basin rare earth mine

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 a river basin rare earth mine. Background technique [0002] Rare earth mine tail water is a kind of rare earth in-situ leaching mining process due to leaching liquid (NH4) 2 SO 4 The solution seeps into groundwater, and then collects into the surface water of the small watershed of the mining area. The amount of water in different basins and the distance from the mining area are different. The concentration of ammonia nitrogen is in the range of 40mg / L-200mg / L, and the concentration of nitrate nitrogen is in the range of 20mg / L-40mg / L; (2) The organic carbon content is very low, basically It does not contain phosphorus and has poor biodegradability; (3) the water volume is large, and the water volume of a single small watershed is thousands of tons to over 10,000 tons per day; (4) the water volume and ammonia ni...

AI Technical Summary

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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