Aluminum sulfate in wastewater treatment coagulant or flocculant is

To clear aluminum sulfate coagulant or flocculant is , first of all , we must first understand what is flocculation , what  aluminum stearate is concrete ? What is the principle of their application ? The application in wastewater treatment is kind of how ? And what difference ?
Coagulation is the sewage in the sewage , such as adding aluminum sulfate , ferrous sulfate, coagulation agents, suspended in water to electrostatic repulsion between the colloidal particles to eliminate , and then with sulfuric acid such as aluminum or PAM ability of  plastic processing aid suspension a combination of cohesion and flocculation process . What is the cohesion, which is a coagulation agent using a large amount of positively charged ions to eliminate electrostatic repulsion between the colloidal particles , the suspension coalescence . What is the wastewater flocculation , which is also the sewage dosing coagulation agent for processing, but this is no ordinary coagulation agents, but the polymer coagulation agent , the solution for the linear structure of polymers, the use of binding frame role of the small suspension bridge formed floc settling .
Aluminum sulfate in wastewater tiny particles with condensed sedimentation and adsorption effect. That is , the  Metal stearate sewage treatment aluminum sulfate coagulation agents. However , aluminum sulfate do not have the effect of bridging bond , in the absence of suspended colloidal particles can not be condensed under the premise and subsidence . Only present in the sewage on the basis of the colloidal particles floc process . Thus , aluminum sulfate is coagulant.