Abstract
Membrane bioreactor (MBR) has been widely used in sewage treatment, effectively solving many long-standing problems such as solid-liquid separation. In this paper, the internal pressure parallel type hollow fiber membrane module was taken as the research object. Based on the CFD theory and method, the solid-liquid separation of the flow entering the membrane module was simulated by FLUENT software. Firstly, the geometric model of the internal pressure parallel membrane module was established by the computational fluid dynamics (CFD) preprocessor and structured meshing was performed. Then the volume fraction of suspended solid (SS) at the exit of the model was calculated by Eulerian multi-phase flow model and Phase Coupled SIMPLE algorithm. The calculation results were presented as images in the CFD post processor. In this paper, the simulation calculation for different concentrations of suspended solid showed that the volume fraction of suspended solid at the exit of the model was zero, which was consistent with the actual MBR system operating data. The simulation results indicated that the model established in this paper had higher accuracy. The model can simulate and predict the separation effect of solid-liquid two-phase flow in wastewater treatment, which has certain reference value for MBR engineering design and research.
Highlights
Membrane bioreactor (MBR) has the advantages of good effluent quality, low operating cost, strong system impact resistance, low sludge volume and high degree of automation [1,2]
Computational fluid dynamics (CFD) is a numerical simulation tool developed with modern computer technology [5]
The model was applied to simulate the solid-liquid separation for the sewage entering the membrane module
Summary
Membrane bioreactor (MBR) has the advantages of good effluent quality, low operating cost, strong system impact resistance, low sludge volume and high degree of automation [1,2]. The presence of the MBR membrane increases the ability of the system to separate solid and liquid, bringing about a significant increase in system effluent, water quality and volumetric loading. MBR has some problems that are difficult to solve: complex structure, variable operating conditions, difficult experimental research, high cost, long time and limited experimental results. CFD has the characteristics of less capital investment, fast calculation speed, complete information and strong simulation ability, and is not affected by the size and structure complexity of the research object [8,9,10]. This paper built the MBR membrane module by the CFD tool and achieved the separation of solid-liquid two-phase flow. This article modeled and simplified assumptions for a single filament or a part of the module geometry, reducing computational time
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