aluminum sulfate wastewater in food processing applications

Different stages in the food industry wastewater generated features are not the same. The main raw material in the first washing is suspended contamination produced, and in the production and  PVC foaming board stabilizer processing stage is mainly organic contamination, and in the forming stage as compared to additive contamination. The aluminum sulfate wastewater treatment in the food processing which stage it? Its application is kind of how it?
Aluminum sulfate in the food wastewater treatment applications
In the food industry wastewater, for some small colloidal particles, or some colloidal solution, difficult or impossible to subsidence occurred adding chemical coagulants aluminum sulfate wastewater, making it easy to form large particles settling to remove. Wastewater colloid state of proteins and polysaccharides, ie after dosing oxidized PE WAX  coagulation better removal.
Commonly used in the food processing wastewater coagulation agent
Lime, ferrous sulfate, ferric chloride and aluminum sulfate. Lime is generally not used alone, often used in conjunction with other agents, the optimal dosage and pH should be determined by experiments. Aluminum sulfate in waste water treatment in the food, in addition to a coagulant, but also can serve as a redox agent, alkaline food waste can be used as the acid modifier. It is the versatility in the alkaline waste water chemicals.