Re-Engineering of Clarifiers in Isfahan Water Treatment Plant Using Lamella System

There are many methods for increasing efficiency of turbidity removal such as tube settler, rotating plate or gradient parallel plate. In this study was evaluated conventional sedimentation basin which equipped by lamella system. The pilot used in the study was made up of poleax glass hexagonal having effective height of 1.2m with hydraulic diameter of 50-80 mm. The slope of sedimentation basin was 600 at the basis of horizon. The lamella system was installed onto a segment which located 150 at the basis of center of sedimentation basin. The pilot was located in Isfahan Water Treatment Plant. In fact the segment isolates sedimentation basin into two compartments, first with lamella and another without it.The turbidity of influent and effluent in two compartments were evaluated by SPSS software and T-Student.The result showed that at same condition without lamella, the minimum, maximum and average turbidity removal efficiency in Isfahan Water Treatment Plant were about 0.9%, 54% and 18.9% respectively. But in compartment equipped by lamella system The removal were about 20%, 65% and 35.3%. It can be concluded that the turbidity removal efficiency will be increased if the sedimentation basin would equipped by lamella system