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Research on Operating Conditions of Aeration Tank Based on Numerical Computation

Author: GaoYang
Tutor: WangWei；WangKeLi
School: Harbin Institute of Technology
Course: Environmental Engineering
Keywords: Aeration tank Gas-liquid two-phase flow Numerical Simulation Oxygen transfer Euler model
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


Aeration activated sludge treatment system is important structures , water treatment system and is part of the highest energy consumption , which greatly affects the efficiency of wastewater treatment efficiency and running costs and low energy consumption . Therefore, flow characteristics of aeration tanks and variation for further optimization of the cell body structure, improve operational management has a certain significance. Method as a means of CFD simulations , with simple, intuitive features , visual effect is clear , you can achieve the predicted flow aeration tanks , aeration tanks from another point of view of the design is reasonable. This article first gas-liquid flow oxygen mass transfer mechanism is briefly analyzed to choose the affect oxygen transfer and can be implemented in FLUENT simulation factors ; aeration tank on an analysis of two-phase flow characteristics , and the model was checked. For the aeration tank of a sewage treatment plant , using the Eulerian model in FLUENT and standard k-ε model was simulated , analyzed the aeration tube spacing , aeration tube rows , cell body depth , aeration tanks depth on the flow field effects . Flow field in which aeration tube spacing greatest impact cell body depth with minimal impact ; elevated position only after aeration tube area below the aeration tube produce a weak turbulent kinetic energy and liquid velocities , but does not make the air downward diffusion . In addition to the aeration tanks flow field in the horizontal and vertical variation is analyzed. Volume fraction of air , turbulent kinetic energy , speed and other parameters are as liquid gas rising gradually evenly distributed ; vertical, the air bubble and the junction of the main area of the parameter value and the variation laws are different , but the liquid level reaches the at the time, consistent with the parameters of the basic trends .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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