Publications

The concentration of dissolved oxygen is very important in wastewater whether before or after treatment. It is aprime indicator in determining how satisfactory a biological wastewater treatment is occurring. In this paper, theaeration performance of stepped cascade was investigated. The natural land formation of one of the mountains inLebanon is shaped in several cascade structures with different heights. The aeration efficiency, wind speed, stepheight and flow rate were measured. An empirical correlation predicting the effect of the wind speed, step heightand flow rate on the aeration efficiency (E20) was developed. The results indicated that the step height and theflow rate had a significant effect on the aeration efficiency. For low wind speed there is no significant windeffect on the aeration efficiency, while high wind speed improves the aeration efficiency due to higherturbulence. It was noticed that the aeration efficiency is shown to depend on the biochemical oxygen demand.Keywords: Aeration efficiency, dissolved oxygen, stepped cascade, mathematical modeling