Publications

One of the most important stages and energy intensive operations atthe wastewater treatment plant is the aeration. Several researchers haveconducted laboratory works to investigate the aeration efficiency of steppedcascades. The proposed study consists of taking advantage of the hillytopography of Lebanon mountains for natural wastewater treatment bycreating stepped cascades, without using any types of costly equipment thatmay further result in additional air emissions the environment. In this paper,the natural land formation of one of the mountains in Lebanon is shaped as astepped cascade and the aeration efficiency was measured and compared tomathematical models prepared by Gameson et al., WRL, Nakasone &El-Monayeri. The use of fixed film bacteria has been also investigated. Goodagreement between the site measurements and the models that account forthe flow rate & cascade geometry was obtained. The results indicate that thestepped cascade and the fixed film bacteria contribute to the improvement ofwastewater characteristics.