Mass transfer and benzene removal from air using latex rubber tubing and a hollow-fiber membrane module.
A dense-phase latex rubber tube and a polyporous propylene hollow-fiber membrane module (HFMM) were investigated for control of benzene-contaminated gas streams. The abiotic mass flux observed through the latex tube was 3.9 13 mg/(min.m(2)) for 150 ppm of benzene at various gas and liquid flow rates, while a 100-fold lower mass flux was observed in the HFMM. After seeding with an aromatic-degrading culture enriched from activated sludge, the observed removal was 80% of 150 ppm, corresponding to a mass flux of 45 mg/(min.m(2)). The observed mass flux through the HFMM during biofiltration also rose, to 0.4 mg/(min.m(2)). Because the HFMM had a 50-fold higher surface area than the latex tube, the observed benzene removal was 99.8%. Compared to conventional biofilters, the two reactors had modest elimination capacities, 2.5 18 g/(m(3).h) in the latex tube membrane bioreactor and 4.8 58 g/(m(3).h) in the HFMM. Although the HFMM had a higher elimination capacity, the gas-phase pressure drop was much greater.
Fitch
Mark
M
Department of Civil Engineering, University of Missouri-Rolla, Rolla, MO 65409, USA. mfitch@umr.edu
Neeman
Jeffrey
J
England
Ellen
E
D000393:Air Pollutants / Q000737:chemistry / Q000378:metabolism; D001419:Bacteria / Q000145:classification / Q000378:metabolism; D001554:Benzene / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D007840:Latex / Q000737:chemistry*; D008567:Membranes, Artificial; D008954:Models, Biological; D016062:Porosity; D012212:Rheology / Q000295:instrumentation / Q000379:methods; D012722:Sewage / Q000382:microbiology; D014462:Ultrafiltration / Q000295:instrumentation* / Q000379:methods
D000393:Air Pollutants; D005740:Gases; D007840:Latex; D008567:Membranes, Artificial; D012722:Sewage; D001554:Benzene