Numerical simulation of a horizontal sedimentation tank considering sludge recirculation  

作　　者：Wei Zhang Zhihong Zou Jun Sui 

机构地区：[1]School of Economics and Management, BeiHang University, Beijing 100191, China. [2]Guangzhou Municipal Engineering Design & Research Institute, Guangzhou 510060, China

出　　处：《Journal of Environmental Sciences》2010年第10期1534-1538,共5页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50778009);the Ministry of Environmental Protection of China(No. 200809074)

摘　　要：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 differences between the simulated values and the experimental values were significant.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 differences between the simulated values and the experimental values were significant.

关 键 词：concentration and isoconcentration distribution suspended sediment transportation model velocity field verticaldistribution. 

分 类 号：TU991.23[建筑科学—市政工程] X703[环境科学与工程—环境工程]