Evaluating the Coagulants of Polyaluminum Silicate Chlorides on Turbidity Removal

Abstract Polyaluminum silicate chloride (PASiC) is a new inorganic coagulant and has different characters from other cationic inorganic products used in water treatment. The optimal formulas and conditions to produce and use PASiC are not thoroughly well‐known. PASiC can be formed by treating AlCl3 solution with silicate compounds and the insoluble aluminum silicates are produced thereafter. It has been found that partially decreasing alum acidity with silicate would form a more stable solution than polyaluminum chloride (PAC). PASiC may enhance aggregation by the silicate in it to remove turbidity especially for the water of low turbidity and alkalinity. In this research, a series of PASiC coagulants were produced from the different basicities (B) and Al/Si molar ratios at the different aging temperatures and aging times. Accordingly, PASiCs prepared by the different basicities (B) and Si/Al molar ratios were added in a synthetic water with low turbidity and alkalinity to evaluate the efficiency of PASiC...