Experimental Study of Mass Transfer Phenomena in a Cross Flow Membrane Bioreactor: Aeration and Membrane Separation

Experimental work carried out on wastewater from a wastewater treatment plant (WWTP) showed that in a cross flow membrane bioreactor the gas/liquid transfer is highly dependent on the biomass concentration. In new biological wastewater membrane treatment processes (mostly using deep end membranes), the biomass concentration is usually about 15 g/L, which entails a decrease in the bioreactor aeration capacity by a factor of approximately four compared with clean water. The gas/liquid transfer may therefore become a limiting step in this type of process. To prevent the operating costs of the biological treatment from increasing, it is imperative that the oxygen transfer be optimized. Membrane experiments showed that the permeate flux is highly dependent on the biomass concentration and the tangential velocity in the membrane module.

[1]  R M Ben Aim,et al.  Membrane bioreactors for wastewater treatment and reuse: a success story. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[2]  M. Galán,et al.  Prediction of kLa in yeast broths , 1999 .

[3]  B. Keskinler,et al.  High strength wastewater treatment in a jet loop membrane bioreactor: kinetics and performance evaluation , 2005 .

[4]  J Krampe,et al.  Oxygen transfer into activated sludge with high MLSS concentrations. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[5]  Nazim Cicek,et al.  Characterization and Comparison of a Membrane Bioreactor and a Conventional Activated‐Sludge System in the Treatment of Wastewater Containing High‐Molecular‐Weight Compounds , 1999 .

[6]  P Cornel,et al.  Investigation of oxygen transfer rates in full scale membrane bioreactors. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[7]  Bassim Abbassi,et al.  Minimization of excess sludge production by increase of oxygen concentration in activated sludge flocs; experimental and theoretical approach , 2000 .

[8]  P. Peringer,et al.  Volumetric oxygen mass transfer coefficient in an upflow cocurrent packed-bed bioreactor , 1998 .

[9]  Matthias Kraume,et al.  Filterability of activated sludge in membrane bioreactors , 2002 .

[10]  B. Özbek,et al.  The studies on the oxygen mass transfer coefficient in a bioreactor , 2001 .

[11]  Jong Hoon Kim,et al.  Morphology control of Monascus cells and scale-up of pigment fermentation , 2002 .

[12]  Oxygen transfer in viscous non-Newtonian liquids having yield stress in bubble columns , 2003 .

[13]  J. Vaxelaire,et al.  Oxygen Transfer in Activated Sludge Surface-Aerated Process , 1995 .

[14]  Comparison of different oxygen transfer testing procedures in full-scale membrane bioreactors. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[15]  Nicolas Roche,et al.  State-of-the-art: rheological characterisation of wastewater treatment sludge , 2003 .