Treatment technology of pickling phosphating wastewater treatment
The pickling phosphating wastewater treatment equipment adopts the treatment process of coagulation precipitation+air floation +filtration.
The process of pickling phosphating wastewater treatment equipment is as follows: the wastewater discharged from the workshop first enters the grease trap regulating tank, after a series of treatment, the oil float is intercepted by the grease trap, the remaining mixed wastewater enters the regulating tank, and then enters the reaction tank, the reaction tank reaction is divided into two parts, 1. PH regulation. 2. Add chemical agents. After the reaction, the mixed liquid enters the sedimentation tank, and the supernatant of the sedimentation tank enters the flocculation reaction tank, and PAC and PAM are added to remove most of the COD and fine particulate suspended matter in the water.
Phosphating wastewater is characterized by: containing a large number of phosphate, zinc ions, acid and alkali substances and organic matter, different production processes sometimes produce other complex components that are more difficult to deal with. At present, the treatment of such wastewater is mainly based on physical and chemical methods, that is, according to different treatment objects and treatment purposes, the combination of distributed precipitation, air flotation, filtration, activated carbon adsorption and membrane separation technology. In the process selection, it is necessary to consider the reduction of process links, reduce project investment and operation difficulty, and consider the mutual interference between different pollution factors to reduce the treatment effect. The main pollution factors in pickling phosphating wastewater are phosphate and zinc ions, among which phosphate is also the difficulty of phosphating wastewater treatment.
Pickling phosphating wastewater treatment equipment list: grease trap regulating tank, reaction tank 1, inclined plate sedimentation tank, reaction tank 2, air flotation equipment, sludge thickening tank, plate and frame filter press.