Effect of Geometrical dimensions and wastewater Temperature on the performance of an Induced Air Flotation unit for the treatment of industrial waste water

Induced Air Flotation (IAF) systems had found great deal of interest for their high performance in oil/water separation for the treatment of municipal and industrial wastewater that can be achieved with simple and cheap operation compared with other systems such as the diffused air flotation. This paper is dedicated to the study of effects of geometrical dimensions, and water temperature on the separation efficiency of IAF process that handles effluent of Dairy Industry. Operation of IAF was based on the best factors gained by Al-Maliky, 2009 for the treatment of effluent of Dairy Industry. Results have shown that, ratios higher than 1-1 (width- height) of flotation tank tend to increase the separation efficiency under the same detention time; 1.25-1, 1.5-1, 1.75-1 and 2-1Â had made an addition of 4.5, 5.2, 8.3 and 10.12% to the efficiency gain made by 1-1. Far from 2-1 was appeared to have a reverse effect in reducing the separation efficiency. The raise in wastewater temperature had shown a significant role in enhancing the water/oil separation efficiency, until it reaches about 80-84 ?C, beyond which that efficiency tends to decrease as oil flocs tend to scrap and layer disturbances take place. An enhancement of 10-17% occurs when operating the system with wastewater temperature of 80-84 C, and air flow rates of 3-5 l/min, respectively compared with that of 22 ?C and the same air flow rates. This paper was accomplished and edited with the use of logistic and technical resources of the Scholars Rescue Fund SRF and College of Engineering/ Ohio University.Â