Abstract
This research examines the installation and operation of a direct-spraying dissolved air flotation process to remove turbidity and SS (Suspended solids) in the pulsator clarifier of A water treatment plant in B city. To evaluate the performance of the direct-spraying DAF (Dissolved Air Flotation) process, experiments were conducted with raw water before chemical input. As polymer coagulants, Alum (Aluminum sulfate) and PAC (Poly aluminum chloride) are selected in this research, as these are the most widely used in water treatment processes. Installation scales on the site are 50,000 m<sup>3</sup>/d of water treatment capacity of the direct-spraying DAF process, and 10,000 m<sup>3</sup>/d of the wastewater treatment process. For raw water before PAC is added, turbidity and SS removal efficiency of the direct-spraying DAF process at several PAC concentrations (8 mg/L, 15 mg/L, 20 mg/L and 30 mg/L, respectively) are highest at the PAC concentration of 20 mg/L. In particular, during the trial run, the mean turbidity removal efficiency was 91.0 % at the optimum PAC concentration of 20 mg/L in raw water before chemical input.
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