Microporous polypropylene hollow-fiber membranes offer significant adv
antages over packed-tower aeration for removing volatile organic chemi
cals. A laboratory study assessed the performance of membrane air-stri
pping in continuous operation, while exposed to various pretreatments.
Results indicate that membrane air-stripping is compatible with low-p
H or low-chlorine waters but not with waters of high pH or high-chlori
ne concentration or those that are ozonated.