Study on the effect of polyaluminium chloride on the coagulation and algae removal of clay minerals Experimental study on the effect of polyaluminum chloride on the coagulation and algae removal of clay minerals Coagulation is a common unit in the treatment of drinking water and can effectively remove suspended solids in water, Algae and humus and other organic matter. The deterioration of water quality caused by algae pollution has become one of the important issues that affect the safety of drinking water. In drinking water treatment, the presence of large numbers of algal cells will not only increase drug consumption, clogging the filter, in severe cases will make the water smell and generate disinfection by-products. In this paper, the common freshwater cyanobacteria - Microcystis aeruginosa in the surface water as the research object, demonstrates the coagulation removal effect of PAC and PFS on Microcystis aeruginosa, and discusses the conditions of coagulation, water quality and so on The effect of coagulation algae removal effect, on the basis of this study, the effect of clay mineral coagulation algae removal.