Iron phosphate comprehensive wastewater resourceful treatment device and method

Abstract

The invention relates to an iron phosphate comprehensive wastewater resourceful treatment device and method. The device structurally comprises an adjusting tank, a primary reverse osmosis device, a primary reverse-osmosis production water tank, a secondary reverse osmosis device, a pure production water tank, an electrodialysis device, a recycled concentrated water tank and a primary reverse-osmosis concentrated water tank. The treatment method comprises steps as follows: (1), iron phosphate comprehensive wastewater is preliminarily purified and concentrated through the adjusting tank, the primary reverse osmosis device, the primary reverse-osmosis production water tank and the primary reverse-osmosis concentrated water tank, and primary reverse-osmosis production water and primary reverse-osmosis concentrated water are separated out; (2), pure production water meeting the requirement is obtained through purification of the secondary reverse osmosis device and the pure production water tank and is recycled for production; concentrated water for secondary reverse osmosis is returned to the adjusting tank for retreatment; (3), the primary reverse-osmosis concentrated water is concentrated through the electrodialysis device and the recycled concentrated water tank, and recycled concentrated water is sent to a compound fertilizer factory; water produced through electrodialysis is returned to the adjusting tank for retreatment. The iron phosphate comprehensive wastewater resourceful treatment device and method have the advantages as follows: the purpose of resourceful treatment is achieved, and better social and economic benefits are obtained.

Description

technical field [0001] The invention relates to an iron phosphate comprehensive waste water resource treatment device and a method thereof, and belongs to the technical field of industrial waste water treatment. Background technique [0002] The production of ferric phosphate is to use ferrous sulfate, hydrogen peroxide, diammonium hydrogen phosphate and phosphoric acid to produce high-quality ferric phosphate through processes such as synthesis, first washing, aging and second washing. During the production process, synthetic mother liquor and first washing water will be produced. , aging mother liquor, and secondary washing water are combined into ferric phosphate comprehensive wastewater, which contains a large amount of ammonium ions, sulfate ions, and phosphate ions. If it is not treated properly, it will cause serious pollution to the water body. [0003] For iron phosphate comprehensive wastewater, the requirements for water quality are not high. The traditional treat...

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Problems solved by technology

NH in ferric phosphate comprehensive wastewater before treatment 4 + (Ammonium ion): 1000~3000mg / L, PO 4 3- (Phosphate ion): 1500~3500mg / L, SO 4 2- (sulfate ion): 4000~7000mg / L, TDS (total dissolved solid): 6500~13500mg / L; NH produced pure water after treatment 4 + (Ammonium ion) ≤1mg / L, PO 4 3- (Phosphate ion)≤0.5mg / L, SO 4 2- (Sulfate ion) ≤ 2.5mg / L, TDS (total dissolved solids) ≤ 4mg / L, the removal rate reached ≥ 99.9%; the NH of the recovered ferric phosphate wastewater concentrate 4 + (Ammonium ion): 13200~39600mg / L, PO 4 3- (Phosphate ion): 19800~46200mg / L, SO 4 2- (Sulfate ion): 52800~92400mg / L, TDS (Total Dissolved Solids): 85800~178200mg / L, it not only solves the pollution problem of ferric phosphate comprehensive wastewater, the treated water reaches the standard of pure water production, and the treated The pure water is reused in the production water system to achieve the purpose of water saving. The recovered ferric phosphate wastewater concentrate can be directly sent to the compound fertilizer factory as a raw material for compound fertilizer, and avoids the output of a large amount of sludge, which can offset the comprehensive ferric phosphate The operating cost of wastewater treatment not only meets the requirements of environmental protection, but also provides a guarantee for the normal operation of iron phosphate comprehensive wastewater resource treatment

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