Summarization of Wastewater Treatment Patent Technology for Iron Phosphate by Ammonia Process
This paper mainly analyzes the high concentration wastewater produced in the production of ferric phosphate by the ammonia process of"ferrous sulfate+hydrogen peroxide+phosphoric acid+ammonium dihydrogen phosphate".According to the characteristics of ferric phosphate wastewater with high nitrogen,high phosphorus and high sulfate,the patents of ferric phosphate wastewater treatment in recent years are collected and sorted out.These patents are classified into five categories:zero liquid discharge(ZLD)technology for ferric phosphate wastewater treatment,reuse and recycling technology,magnesium ammonium phosphate(MAP)process,traditional lime process,and barium sulfate precipitation process.A brief analysis and introduction were conducted on five typical patents.Provide a technical comparison.Finally,the patent technology of ferric phosphate wastewater treatment is prospected,and the zero liquid discharge and resourceful treatment technology of ferric phosphate wastewater is the most promising.
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