New inorganic polymer coagulants consisting of polysilicic acid are proposed. Polymerization studies revealed that the limiting viscosity is a key indicator in examining the polymerization state of silicic acid. In a polymerization process, gelation time could be controlled sufficiently at a desired value of the limiting viscosity. After the polymerization, new inorganic polymer coagulants were prepared by introducing metal salts into polymerized silicic acid solutions in order to fix metal cations with the polysilicates. With respect to the new inorganic polymer coagulants prepared, a series of experimental studies was carried out to reveal several important physicochemical properties. Their molecular weight was evaluated by means of an ultrafiltration method. Electrophoretic mobilities were measured at various pH values so as to know their electrokinetic natures. Also, the optimal pH range for coagulation was examined in respect to chemical composition of those coagulations. Finally, the coagulation and flocculation ability of the new inorganic coagulants was evaluated in comparison of conventional inorganic coagulants such as aluminum sulfate and polymerized aluminum chloride.
|Number of pages||10|
|Publication status||Published - 1990 Dec 1|
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