Authors : Jabbar H. Al-Baidhani and Haneen Salih Hadi Merjan
Abstract: Pre-sedimentation process is a preliminary treatment process which is by and large used before coagulation and flocculation process in order to eliminate substantial suspended particles from the raw water. These particles can diminish the productivity of coagulation and flocculation forms. A pilot plant is designed according to the theoretical equations and design criteria in order to simulate the problem of practical site conditions, studying the effect of shape and geometry dimensions and explain the behaviour of plain sedimentation tanks for proper tank design and operation. Four pre-sedimentation tanks was conducted on a lab scale models in order to study the effects of shape and dimensions of plain sedimentation tank on the treatment of water of Shatt-Al-Hilla. Based on the investigation results, it was concluded that using of circular pre-sedimentation basin with design parameters of SOR <0.78 m/sec gave removal efficiency exceeds 50% for treatment of Shatt -Al Hilla water. The removal efficiency of turbidity of the raw water using rectangular tank of L = 4W was higher than the rectangular tank of L = 2W and the squared tank by about (4-8)%.
Jabbar H. Al-Baidhani and Haneen Salih Hadi Merjan, 2018. Effects of Shape and Dimensions of Plain Sedimentation Basins. Journal of Engineering and Applied Sciences, 13: 10730-10734.