Iron phosphate wastewater treating and recycling device and method

Abstract

The invention provides an iron phosphate wastewater treating and recycling device and method. The device structurally comprises a pre-treatment system 1, an MAP treatment system 2, an up-to-standard emission treatment system 3 and a liquid zero-emission treatment system 4, wherein iron phosphate wastewater WW is connected to the pre-treatment system 1; a water outlet AB1 of the pre-treatment system 1 is connected with a water inlet AB2 of the MAP treatment system 2; a water outlet BC1 of the MAP (monoammonium phosphate) treatment system 2 is connected with a water inlet BC2 of the up-to-standard emission treatment system 3; a water outlet CD1 of the up-to-standard emission treatment system 3 is connected with a water inlet CD2 of the liquid zero-emission treatment system 4 and an up-to-standard water outlet WD except TDS (total dissolved solids). The iron phosphate wastewater treating and recycling device and method have the advantages as follows: 1, pre-treatment, MAP treatment and primary up-to-standard emission treatment are combined organically; 2, RO (reverse osmosis) is adopted for further concentration, and evaporative crystallization is performed; 3, the purposes of recycling and zero liquid emission are achieved. Besides, recycling of production water and zero emission are realized.

Description

technical field [0001] The invention relates to an iron phosphate waste water treatment and recovery device and a method thereof, and belongs to the technical field of industrial waste water treatment. Background technique [0002] Iron phosphate is an ideal precursor material for automotive lithium-ion power batteries, grid energy storage batteries, and cathode materials for electric tool batteries. With the rapid development of electric vehicles, the demand for power batteries increases, and the demand for iron phosphate continues to increase. However, in the production process of iron phosphate, a large amount of wastewater containing nitrogen, phosphorus and other inorganic salts will be generated. Treatment It is extremely difficult, and its discharge will cause serious damage and impact on the surrounding environment, which obviously restricts the development of the enterprise. It is necessary to invent a new ferric phosphate wastewater treatment device and method tha...

AI Technical Summary

Problems solved by technology

Iron phosphate wastewater NH before treatment 3 -N (ammonia nitrogen): 1000~7500mg / L, after treatment, the effluent NH 3 -N≤25mg / L, removal rate reaches 97.5~99.7%, iron phosphate wastewater TP (total phosphorus) before treatment: 1000~5000mg / L, effluent after treatment TP≤1mg / L, removal rate reaches 99.9~99.98%, it It not only solves the pollution problem of iron phosphate wastewater, but also treats the effluent to meet the standard of production water, and reuses the treated water to the production water system to achieve the purpose of water saving. The recovered ammonium sulfate and magnesium ammonium phosphate can not only offset the iron phosphate The operating cost of wastewater treatment, as well as considerable economic benefits, provide a guarantee for the development of enterprises

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