Biohydrogen production from milk whey by continuous dark anaerobic fermentation in apparatus of two types: start-up stage
Abstract
Production of biohydrogen (H2) from renewable energy sources (production and consumption waste) is an upcoming trend in energy industry. H2 is considered as a unique energy carrier with a high energy yield (122 kJ/g). The paper presents the results of investigating the start-up stage of the process of continuous dark fermentation of milk whey under mesophilic conditions with the production of hydrogen-containing biogas in two types of reactors: with a fixed feed (flooded biofilter – anaerobic filter, AF) and with a movable load (apparatus with fluidized bed loading – AFB). Methanogens are inactivated by the thermal method (90°C, 30 min). At the initial stage of the process, the optimal regime is achieved with hydraulic retention time of 12–14 days, and organic loading rate of 1.88–2.25 kg COD/(m3·day). This mode makes it possible to run the process with a stable biogas generation with hydrogen content of 15.9% (for AF) and 11.4% (for AFB) and maintaining the pH of the medium at 5.72. The total amount of biogas formed over 17 days of dark anaerobic fermentation processing in the AF-type reactor was greater than in the AFB-type reactor. The butyric acid content exceeded the acetic acid content in both types of reactors.
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Copyright (c) 2020 Elza R. Mikheeva1, Inna V. Katraeva2 , and Dmitriy L. Vorozhtsov
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