Process Biochemistry 37 (2002) 915– 920 Air sparging of a submerged MBR for municipal wastewater treatment In-Soung Chang, Simon J. Judd * School of Water Sciences, Cran?eld Uni 6ersity , Bedfordshire , MK 43 0AL , UK Accepted 8 October 2001 Abstract The performance of a submerged tubular membrane bioreactor (MBR) adopting two coarse bubble aeration (sparging) modes is reported. In the ?rst mode,