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Modeling and Biokinetics in Anaerobic Acidogenesis of Starch‐Processing Wastewater to Acetic Acid
Author(s) -
Ahn JohngHwa,
Lee Sangyoung,
Hwang Seokhwan
Publication year - 2004
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp0342811
Subject(s) - acidogenesis , acetic acid , wastewater , chemistry , starch , total organic carbon , anaerobic exercise , hydraulic retention time , steady state (chemistry) , volatile suspended solids , nuclear chemistry , pulp and paper industry , chromatography , environmental chemistry , activated sludge , anaerobic digestion , environmental engineering , biochemistry , organic chemistry , environmental science , biology , physiology , methane , engineering
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 °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 μ 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.