Transient behavior of a biofilter packed with mixed media (of granular activated carbon and compost) inoculated with a pure culture of Pseudomonas putida was observed at the height of each sampling port to treat wasteair containing ethanol. In addition, flooding effects of an excess supply of buffer solution was observed at each sampling port of the biofilter until it recovered the status prior to the flooding. Unlike previous investigations, various process conditions were applied to successive biofilter runs in order to monitor the corresponding unsteady behavior of the biofilter in this work. In early stage of biofilter run the removal efficiency of ethanol maintained almost 100%. However, it began to decrease when inlet load surpassed 100 g/m³/h consistent with maximum elimination capacity. At the end of biofilter-run removal efficiency was decreased and maintained at 40%. The results of this work were compared to those of such biofiltration studies as the work of Christen et al. from the point of view that pure cultures of microorganism were used in both works. Except for the period of flooding effect of the 2nd stage, the inlet load and removal efficiency continued at 105.5 g/m³/h and 95%, respectively, while they were 93.7 g/m³/h and 95%, respectively, according to the result of Christine et al.. Removal efficiency remained at 90% for the beginning period of 3 days of the 3rd stage, and it gradually decreased to 60% for remaining 5 days of the stage with an inlet load of 158.26 g/m³/h, which may be interpreted as better than the result of Christine et al. Their result was that the removal efficiency on the inlet load of 154 g/m³/h of ethanol was continued to be 60% for 6 days of a separate biofilter run and decreased to 40% later. Thus, with similar inlet loads of ethanol, removal efficiency of this work was equivalent to or higher than that of Christine et al..

Biofilter Ethanol Transient Behavior Removal Efficiency Elimination Capacity

Arulneyam D, Swaminathan T, Bioprocess Eng., 22, 63 (2000) 
Auria R, Aycaguer AC, Devinny JS, J. Air Waste Manage. Assoc., 48, 65 (1998)
Bohn HL, "Soil Treatment of Organic Waste Gases, Soils for Management of Organic Wastes and Wastewaters," ASA-CSSA-SSSA, Madison, WI, pp. 607-618 (1977)
Buchner R, "Auswirkungen Verschiedener Betriebszustande in der Biologischen Abluftreinigung am Beispiel von Biofiltem," Ph. D. Thesis, T. U. Wien, Austria (1989)
Cho KS, Ryu HW, Lee NY, J. Biosci. Bioeng., 90(1), 25 (2000)
Christen P, Domenech F, Michelena G, Auria R, Revah S, J. Hazard. Mater., B89, 253 (2002)
Chung YC, Huang CP, Tseng CP, Biotechnol. Prog., 12(6), 773 (1996) 
Chung YC, Huang C, Tseng CP, J. Biotechnol., 52, 31 (1996) 
Chung YC, Huang C, Tseng CP, Chemosphere, 43, 1043 (2001) 
Deshusses MA, Hamer G, Dunn IJ, Environ. Sci. Technol., 29, 1048 (1995)
Deshusses MA, Dunn IJ, "Modelling Experiments on the Kinetics of Mixed-solvent Removal from Waste Gas in a Biofilter," Proceedings of the 6th European Congress on Biotechnology (L. Alberghina, L. Frontali and P. Sensi eds.), Elsevier Science B. V., pp. 1191-1198 (1994)
Deshusses MA, Hamer G, Bioprocess Eng., 9, 141 (1993) 
Eckhart A, Proceedings of Biological Treatment of Industrial Waste Gases, Dechema, Heidelberg, Germany, Mar. 24-26, 2pp (1987)
Hirai M, Ohtake M, Shoda M, J. Ferment. Bioeng., 70, 334 (1990) 
Hodge DS, Devinny JS, Environ. Prog., 13(3), 167 (1994)
Hodge DS, Devinny JS, J. Environ. Eng., 121(1), 21 (1995) 
Islander RI, Devinny JS, Mansfield F, Postyn A, Shin H, J. Environ. Eng., 117, 751 (1991)
Jorio H, Kiared K, Brzezinski R, Leroux A, Viel G, Heitz M, J. Chem. Technol. Biotechnol., 73(3), 183 (1998) 
Lee TJ, Kwon OY, An SJ, J. KSEE, 22, 1601 (2000)
Leson G, Winer AM, J. Air Waste Manage. Assoc., 41, 1045 (1991)
Leson G, Smith BJ, J. Environ. Eng.-ASCE, 123(6), 556 (1997)
Lim KH, Lee EJ, Korean J. Chem. Eng., 20(2), 315 (2003)
Metcalf and Eddy Inc., "Wastewater Engineering: Treatment, Disposal and Reuse," Tata Mcgraw Hill Publishing Company, New Delhi (1996)
Mohseni M, Allen DG, Chem. Eng. Sci., 55(9), 1545 (2000) 
Ottengraf SPP, "Exhaust Gas Purification, Biotechnology (H.J., Rehm, G. Reed, eds.)," VCH, Weinheim, Germany, Vol. 8, pp. 426-452 (1986)
Ottengraf SPP, vandenOever AHC, Biotechnol. Bioeng., 25, 3089 (1983) 
Oyarzun P, Arancibia F, Canales C, Aroca GE, Process Biochem., 39(2), 165 (2003) 
Shim JS, Jung JT, Sofer S, Lakhwala F, J. Chem. Technol. Biotechnol., 64(1), 49 (1995) 
Sorial GA, Smith FL, Suidan MT, Biswas P, J. Air Waste Manage. Assoc., 45, 801 (1995)
Swanson WJ, Loehr RC, J. Environ. Eng.-ASCE, 123(6), 538 (1997)
Tang B, Hwang SJ, Hwang S, Hazardous Waste & Hazardous Materials, 12(3), 207 (1995)
Wani AH, Branion MR, Lau AK, J. Hazard. Mater., 60, 287 (1998) 
William TO, Miller FC, Biocycle, 33, 75 (1992)
Shareefdeen Z, Baltzis BC, Chem. Eng. Sci., 49(24), 4347 (1994)