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Hyperconcentrated Solid-Liquid Two-Phase Flow Simulation On Vortex Grit Chamber In Sandstone Wastewater Treatment

Posted on:2011-01-18Degree:MasterType:Thesis
Country:ChinaCandidate:T LiFull Text:PDF
GTID:2131330338981728Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
In the process of hydropower project construction, a lot of high turbidity wastewater is produced, and can result in severe environmental pollution without treatment.Aiming at the problems that the vortex grit chamber in sandstone wastewater treatment system is usually filled with silt and the sediment is dewatered difficultly, the idea of fractionated precipitation is proposed. The coarse particles, which are easily settling, would be removed mainly in the first stage chamber. Then the secondary coarse particles settle down in the second stage chamber in order to reduce the burden of the following treatment. Finally the fine particles, which are stable in the water, would be removed by flocculation. In this paper, the Computational Fluid Dynamics (CFD) simulation is applied, and the influence of blade structures and operating parameters, including blade quantity, blade angle and Hydraulic Retention Time (HRT), are studied. Eulerian-Lagrangian and Eulerian-Eulerian two-phase models are presented for the modeling of the grit chamber respectively, so as to obtain the flow field and particle distribution of the Hyperconcentrated Solid-Liquid Two-Phase flow. Combined with the vortex grit chamber in Pubugou hydropower engineering, the hyperconcentrated two-phase flow is simulated. Based on Luan's research[30], the influence of blade quantity, blade angle and HRT are discussed. Moreover, the optimum conditions are achieved.
Keywords/Search Tags:vortex grit chamber, sandstone wastewater, hyperconcentrated two-phase flow, Eulerian-Eulerian model, Eulerian-Lagrangian model
PDF Full Text Request
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