Experimental Study on the Effect of Different Concentration of Wastewater on the Deposition Rate of Cohesive Sediments by using Rotating Circular Flume

Sedimentation in water conveyance channels is one of the main problems in the operation of irrigation systems. In recent years, wastewater has been used in agriculture. This may affect the rate of the channel sedimentation. In order to assess this matter, some experimental tests were conducted in an annular flume. In these experiments the velocity and the shear stress profiles were measured using an Acoustic Doppler Velocimeter (ADV). During the experiments, deposition rate of the sediments were determined by using the measured suspended sediment concentration. The results showed that adding 30% to 60% wastewater caused deposition rate of the sediments to be increased at a rate of 39%. In this work a significant difference between the effect of 30% and 60 % wastewater concentration was not observed. For all experiments, it was observed that the arrival time for deposition of a certain amount of suspended sediment in a fluid- containing wastewater occurred in a shorter period of time.