Removal of VOCs from air by membrane-based absorption and stripping

Poddar, Tarun K.; Majumdar, S.; Sirkar, Kamalesh K.

doi:10.1016/0376-7388(96)00145-7

Cited by 69 publications

(63 citation statements)

References 10 publications

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“…Silicone oil has small gas-absorbent partition coefficients for toluene and for oxygen, it is miscible with toluene, and it features a high solubility for oxygen (De Bo et al, 2002;Poddar et al, 1996;Studer, 2005). Silicone oil has successfully been applied as an absorbent in biological waste gas treatment systems to control fluctuating concentrations of organics (Koutinas et al, 2006;Oliveira and Livingston, 2003).…”

Section: Discussion and Conclusion Experimental Set-upmentioning

confidence: 99%

Novel membrane bioreactor: Able to cope with fluctuating loads, poorly water soluble VOCs, and biomass accumulation

Studer

Rohr

2007

Biotech & Bioengineering

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Biological waste gas treatment is an attractive method for controlling air emissions of volatile organic compounds (VOCs). Microorganisms degrade the VOCs to harmless products such as carbon dioxide (CO(2)), biomass and water. In spite of the advantages, significant unresolved challenges remain for biological waste gas treatment. Fluctuating loads in waste gas streams, especially of VOCs with low water solubility, can often not be satisfactorily removed. Concentration peaks leave the reactor virtually untreated, while periods without VOCs in the waste gas lead to starvation of the bacteria. Furthermore, bioreactors are often subject to clogging due to biomass accumulation. In the current work, a flat sheet membrane bioreactor was developed which was able to buffer fluctuating loads of toluene, our model compound, by absorption in silicone oil prior to degradation and which continuously removed and discharged excess biomass from the reactor. The absorption and the biodegradation were both membrane based. An inverse bacterial biofilm developed on the membrane, which separated the culture medium from the absorbent. The culture medium was constantly passed along the biofilm, introducing shear stresses on the surface and thereby removing excess, inactive biomass. The toluene surface elimination capacity was virtually independent of the gas flow rate for the tested steady-state conditions and reached a maximum of 0.6 g m(-2) h(-1). Experiments with fluctuating inlet mass flow rates of toluene confirmed the excellent buffering capability of the set-up. The reactor was successfully operated for 162 days without clogging.

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Section: Discussion and Conclusion Experimental Set-upmentioning

confidence: 99%

Novel membrane bioreactor: Able to cope with fluctuating loads, poorly water soluble VOCs, and biomass accumulation

Studer

Rohr

2007

Biotech & Bioengineering

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“…The VOC-N 2 mixtures were supplied in standard cylinders (Matheson, E. Rutherford, N.J.) containing relatively high VOC concentrations (993 ppmv acetone, 999 ppmv dichloromethane, 514 ppmv methanol, 236 ppmv toluene). At gas residence times of 1-1.5 seconds in silicone oil flowing at approximately 5% of the gas flow rate through the extraction module, the dichloromethane exit gas concentration was approximately 50 ppmv and the toluene exit gas concentration was about 25 ppmv (Poddar, 1996b).…”

Section: A-14mentioning

confidence: 99%

“…The permeability of the selectivity top layer should furthermore be as high and its thickness as low as possible. (Kimmerle, 1991) This conclusion is endorsed by a large number of practitioners in the field (Koros, 1993;Parthasarathy, 1994;Stern, 1994;Prasad, 1994;Nagai, 1997;Zhu, 1983;Blume, 1990;Bessarabov, 1996;Das, 1998;Poddar, 1996b;Cha, 1996) who have evaluated single polymer and composite membranes for gas separation and VOC removal from liquid and air streams.…”

Section: Composites Versus Single-polymer (Simple) Membranesmentioning

confidence: 99%

“…Kamalesh Sirkar's research group has investigated membrane-mediated absorption for VOC removal from gas streams (Poddar, 1996b;Poddar, 1996a, Poddar, 1997. Hollow fibers constructed of microporous,…”

Section: Membrane-mediated Absorptionmentioning

confidence: 99%

“…What is obvious is that longer residence times are required for high removal percentage as VOC concentration decreases. This absorption system was also operated in an absorbent recycle mode with an uncoated hollow-fiber module used to remove VOC from the gas stream (Poddar, 1996b). After extracting VOC from the air, the absorbent flows through the coated, hollow-fiber module membrane operated as a pervaporator.…”

Section: A-14mentioning

confidence: 99%

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Membrane-Mediated Extraction and Biodegradation of Volatile Organic Compounds From Air

Peretti¹,

Shepherd²,

Clayton³

et al. 2005

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Membrane Contactors

Sirkar

2008

Advanced Membrane Technology and Applications

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Removal of VOCs from air by membrane-based absorption and stripping

Cited by 69 publications

References 10 publications

Novel membrane bioreactor: Able to cope with fluctuating loads, poorly water soluble VOCs, and biomass accumulation

Novel membrane bioreactor: Able to cope with fluctuating loads, poorly water soluble VOCs, and biomass accumulation

Membrane-Mediated Extraction and Biodegradation of Volatile Organic Compounds From Air

Membrane Contactors

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