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1 2024

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Determination of Kinetic Models in Acidogenesis Process of Palm Oil Mill Effluent

Trisakti Bambang, Turmuzi Muhammad, Taslim Taslim, Irvan Irvan

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 10

118--125

Palm oil mill effluent (POME) can be transformed into biogas. Acidogenesis, as a fermentation process, involves decomposition of hydrolysis products into simpler organic products in the form of acetate, hydrogen and carbon dioxide. Intermediate products from acidogenesis form of volatile fatty acids (VFA), such as propionate, butyrate, valerate, and their isoforms, which require further metabolic processes to produce biogas. The aim of the research was to determine the suitable kinetics model that describes microbial growth (from volatile suspended solid (VSS) values) and production in the acidogenesis process. The reactor used in this acidogenesis process was a stirred tank reactor with a volume of 6 L and operates in a batch system. This research was conducted with a variable agitation rate variation (200; 250; and 300 rpm) at a temperature of 30 °C and 55 °C. The pH was varied, including 5; 5.5; and 6. The kinetic models used in this study were Modified Gompertz, Monod, and Logistic. The best effect of pH on VSS was obtained at pH 5.5, agitation rate on VSS was obtained at agitation rate of 250 rpm and operating conditions for acidogenesis process was achieved under thermophilic conditions (55 °C). Logistic kinetic model is the best kinetic model that can describe VSS and VFA in this study.