Abstract
An alkaline (NaAlO 2 ) and an acid (Al 2 (SO 4 ) 3 · 18H 2 O) Al +3 -salt have been compared as coagulant both in water and wastewater treatment. From the efficiency point of view, NaAlO 2 performs slightly worse; this is closely connected to its slower chemical precipitation kinetics. In wastewater flocculation, volatile suspended solids and the soluble COD fraction appear to be important system parameters. Three mechanisms govern the process: adsorption, sweep coagulation and autocoagulation.
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