title: Modeling and biokinetics in anaerobic acidogenesis of starch-processing wastewater to acetic acid.
abstract: Starch-processing wastewater was anaerobically treated to produce acetic acid in laboratory-scale, continuously stirred tank reactors. The optimal conditions, in which the maximum acetic acid production occurred, were 0.56 d hydraulic retention time, pH 5.9, and 36.1 degrees C. Acetic acid production at the optimum conditions was 672 +/- 20 mg total organic carbon(equivalent) L(-)(1), which indicated a 75% conversion efficiency of influent total organic carbon into acetic acid. A fourth order Runge-Kutta approximation was used to determine the Monod kinetics of the acidogens by using unsteady-state data from continuous unsteady-state experiments at the optimum conditions. The model outputs and experimental data fit together satisfactorily, suggesting that the unsteady-state approach was appropriate for the evaluation of acidogenic biokinetics. These included micro(m), K(s), Y, and k(d), which were evaluated as being 0.13 h(-)(1), 25 mg total carbohydrate (TC) L(-)(1), 0.38 mg volatile suspended solid mg(-)(1) TC, and 0.002 h(-)(1), respectively.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, Korea.
authors.forename: Johng-Hwa
authors.initials: JH
authors.lastname: Ahn
authors.forename: Sangyoung
authors.initials: S
authors.lastname: Lee
authors.forename: Seokhwan
authors.initials: S
authors.lastname: Hwang
mesh_terms: D019342:Acetic Acid / Q000378:metabolism*; D000693:Anaerobiosis / Q000502:physiology; D001421:Bacteria, Anaerobic / Q000166:cytology / Q000502:physiology*; D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D002455:Cell Division / Q000502:physiology; D003198:Computer Simulation; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control; D007700:Kinetics; D008954:Models, Biological; D013213:Starch / Q000378:metabolism*; D013696:Temperature; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D013213:Starch; D019342:Acetic Acid