An example of iron phosphate wastewater resource recovery project
According to the characteristics of the iron phosphate wastewater from a new energy enterprise such as high impurity ions content,high ammonia nitrogen and total phosphorus concentrations and so on,a combined process of ammonia precipitation impurity removal-membrane separation-MVR evaporation salt crys-tallization was adopted for resource recovery,ammonium sulfate and monoammonium phosphate in reclaimed wa-ter and wastewater were recycled.The operation results indicated that,through pretreatment,the removal rates of total ions and Mn2+were above 99.5%and 99%respectively,the mass concentration of ammonium sulfate in the membrane concentrated water was above 160 000 mg/L,the quality of the byproduct ammonium sulfate satisfied the type Ⅰ index requirements of GB/T 535-2020 Fertilizer grade ammonium sulphate,the quality of monoam-monium phosphate met the index requirements of traditional top quality goods of powder monoammonium phos-phate in GB/T 10205-2009 Monoammonium phosphate and diammonium phosphate,the net income of ton wastewater recycling treatment was about 9.8 yuan.
iron phosphate wastewaterrecyclingpretreatmentmembrane concentrationMVR evaporationammonium sulfatemonoammonium phosphate