Mass transfer and benzene removal from air using latex rubber tubing and a hollow-fiber membrane module |
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Authors: | Fitch Mark Neeman Jeffrey England Ellen |
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Affiliation: | (1) Department of Civil Engineering, University of Missouri-Rolla, 65409 Rolla, MO;(2) Black & Veatch, 8400 Ward Parkway, 64114 Kansas City, MO |
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Abstract: | 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·m2) 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 toa mass flux of 45 mg/(min·m2). The observed mass flux through the HFMM during biofiltration also rose, to 0.4 mg/(min·m2). Because the HFMM had a 50-fold higher surface area than the latex tube, the observed ben zene removal was 99.8%. Compared to conventional biofilters, the two reactors had modest elimination capacities, 2.5–18 g/(m3·h) in the latex tube membrane bioreactor and 4.8–58 g/(m3·h) in the HFMM. Although the HFMM had a higher elimination capacity, the gas-phase pressure drop was much greater. |
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Keywords: | Biofiltration biofilter benzene membrane latex hollowfiber membrane module biokinetic |
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