Study of induced air flotation for the removal of oils from the effluents of sweets and dairy industries

الملخص EN

The presence of oil and grease in the industrial effluents has a very bad impact on both the treatment units and the disposal media.

One of the important oil / water separation techniques is the Induced Air Flotation.

The principal aim of this paper is to determine the proper air flow rate for oil / water separation, in a laboratory scale IAF batch system, for two types of industrial waste waters ; Sweets and Dairy Industries.

The impact of Alum as a coagulation agent, on the separation efficiency via flotation process, is also studied.

Results have shown that (3-5 l / min.) air flow rates are the optimal for having separation efficiencies between (77 %-80 %) for effluent of Sweets industry, and (66 %-70 %) for effluent of Dairy industry.

The addition of (0.5 g / l) Alum has proved significant influence on oil / water separation efficiency, which could reach the values of (96 %-99 %), using the air flow rates mentioned above, for Dairy and Sweets industrial effluents respectively.