Kinerja dan kinetika produksi biohidrogen secara batch dari sampah buah melon dalam reaktor tangki berpengaduk

Abstract

Abundant amount of melon fruit waste with high sugar anda water content is potential as a substrate for hydrogen production by dark fermentation. This study investigated the performance of biohydrogen production from melon fruit waste in a stirred tank reactor with initial concentration 13100 mg sCOD/L, in a room temperature, initial pH 7 and controlling final pH 5.5 by adding NaOH. The fermentation lasted for 24 hours. pH, VS, sCOD, VFA, biogas volume, hydrogen content, and cell concentration was analized every hour to determine the performance of reactor. Hydrogen content yielding 16.20% with hydrogen production rate (HPR) of 458.12 mL/Lreactor/day in STP condition. Substrate consumption at the end of fermentation reached 24.61% sCOD and 78.28% VS. Metabolite products was dominated by acetate and butyrate with butyrate to acetate ratio of 1.2.  The kinetic of product formation was investigated by the kinetic model of Gompertz. Meanwhile the kinetics of cell growth was approximated by Logistics model.