Abstract
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.
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