Aquatic environment

Numerical simulation of a horizontal sedimentation tank consideringsludge recirculation

Wei Zhang , Zhihong Zou , Jun Sui


Received January 25, 2010,Revised April 08, 2010, Accepted , Available online

Volume 22,2010,Pages 1534-1538

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Most research conducted on the concentration distribution of sediment in the sedimentation tank does not consider the role of the suction dredge. To analyze concentration distribution more accurately, a suspended sediment transportation model was constructed and the velocity field in the sedimentation tank was determined based on the influence of the suction dredge. An application model was then used to analyze the concentration distribution in the sedimentation tank when the suction dredge was fixed, with results showing that distribution was in accordance with theoretical analysis. The simulated value of the outlet concentration was similar to the experimental value, and the trends of the isoconcentration distribution curves, as well as the vertical distribution curves of the five monitoring sections acquired through simulations, were almost the same as curves acquired through experimentation. The di erences between the simulated values and the experimental values were significant.

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