Effect of Aeration Conditions on the Flow Field in the Submerged Membrane Bioreactor

Abstract:

A full size 3D numerical simulation of gas liquid two-phase flow in a submerged membrane bioreactor was carried out. The standard k-ε turbulence model and Euler multiphase flow model of fluent were used. The effect of changed aeration conditions in the reactor on the gas holdup and gas-liquid velocity distribution in the reactor was studied. The simulation results were shown that, at the same aeration rate, the liquid and gas velocities of 1mm hole aerated at the membrane surface increased faster than 2 mm and 3mm aeration holes; At the same aeration hole , with the increase of aeration rate，the liquid and gas velocities at the membrane surface increased; At the 1mm aeration hole and 5.5m³/h aeration rate, the vortex area was larger and gas holdup was higher, so that gas and liquid were contacting well and the membrane surface scouring effect was better; The Simulation also shown that local gas holdup was lower at close to the wall at the bottom of the reactor, this was not conducive to the growth of microorganisms in the activated sludge, the need to further optimize the structure of aeration and reactor.

• Periodical: Applied Mechanics and Materials (Volume 535)
• Pages: 539-546
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.535.539
• Online since: February 2014
• Authors: Shi Lu Xing, Zhong Lan Tao*, Jian Ming Niu, Rui Tian, Chun Li Li
• Keywords: Aeration Conditions, Flow Field, Numerical Simulation, Submerged Membrane Bioreactor

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