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Received December 27, 2001
Accepted November 26, 2002
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Fate of Methanol in an Anaerobic Digester
Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA
einsteinpark@hanmail.net
Korean Journal of Chemical Engineering, May 2003, 20(3), 509-516(8), 10.1007/BF02705557
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Abstract
This paper mill was concerned with the anaerobic biodegradability of methanol, its by-products and the potential for gas stripping the system. A series of laboratory-scale experiments were conducted to evaluate the fate of methanol during anaerobic treatment. According to our research result, more than 99% of methanol contained in the condensate was biodegraded during anaerobic digestion. From an anaerobic digester batch test, the second order biodegradation rate constant, kb2, was estimated to range from 3.97×10(-3) m(3)/gㆍday (when only condensate was fed) to 4.06×10(-2) m(3)/gㆍday (when condensate was fed at a proposed rate). The by-products from methanol degradation such as acetaldehyde, and methyl ethyl ketone, were degraded completely in 32 hours. Since the anaerobic treatment process has a retention time of 5 days, condensate by-products are believed to be completely biodegraded. The introduction of condensate into the existing anaerobic pretreatment process appears to improve the treatment efficiency, leading to a more stable anaerobic treatment as well as a reduced sludge generation in the aerobic wastewater treatment process due to the reduced organic loading.
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David P, Roland B, Water Res., 33(4), 947 (1999)
EPA Regulation 749-F-94-013 (1994)
Hughes DE, "In Anaerobic Digestion," Eds. Elsevier, Amsterdam, Netherlands, 3 (1981)
McCarty PL, Smith DP, Environ. Sci. Technol., 20(12), 1200 (1986)
Nishio N, Roberto GS, Kazuhiko H, Shiro N, J. Ferment. Bioeng., 75(4), 309 (1993)
Parker WJ, Farquhar GJ, Hall ER, Environ. Sci. Technol., 27(9), 1783 (1993)
Rintala J, Water Sci. Technol., 24(1), 69 (1991)
Scheunert I, Vockel D, Schmitzer J, Korte F, Chemosphere, 16, 1031 (1987)
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Speece RE, Water Res., 22(3), 365 (1988)
Woods SL, Ferguson JF, Benjamin MM, Environ. Sci. Technol., 23(1), 62 (1989)
Zafar IB, Furukawa K, Fujita M, Water Res., 30(11), 2559 (1996)
