REMOVAL OF FINE PARTICLES FROM WASTEWATER USING INDUCED AIR FLOTATION

Abstract

The suspended solids must be removed from effluent prior to re-using or discharging into environment. In order to remove the fine particles, large basins are needed to provide sufficient retention time due to the extreme low settling velocities, therefore flocculants or coagulants have to be added to increase the settling velocity and efficiency of settling basins. For removing suspended particles from wastewaters, flotation and floc-flotation methods are getting attention recently due to their advantages over the other methods. In this study, IAF process (Induced Air Flotation -Jameson Flotation) was applied to synthetic wastewater containing fine quartz particles. Preliminary results of flotation experiments which were carried out by Jameson flotation cell were given. Effect of particle size and solid/liquid ratio on the turbidity removal efficiency was researched. The synthetic wastewater samples containing suspension of very fine quartz particles was pre-treated with/without anionic flocculant addition and then introduced to the Jameson flotation cell with cationic type collector (amine). Reasonable turbidity removal efficiencies were obtained for the particles larger than 20 µm, however the results were not good as for the -20 µm particles. The experimental works have shown that over 90 % turbidity removal efficiency of -20 µm particles was possible at the lowest solid/liquid ratio (0.06 %) tested when floc-flotation studies was applied by Jameson cell

Keywords

• Wastewater treatment, flotation, flocculation, induced air flotation, Jameson cell

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