Produktion av flyktiga fettsyror genom anaerobisk rötning av pappersmassa och papperslam

Sammanfattning: Recently, there has been an increased interest in the production of volatile fatty acids from pulp and paper sludge using an immersed membrane bioreactor during anaerobic digestion. The production of biogas through anaerobic digestion has been a hot topic in recent years, but it is no longer economically viable due to competition from fossil fuels. As a result, the production of volatile fatty acids has been investigated in this study using pulp and paper sludge as substrate. To investigate the effect of methane inhibition on enhanced volatile fatty acid production, various parameters, and pre-treatments such as pH, O2 presence, thermal heat shock, and chemical BES-addition were used. Heat shock pre-treatment produced the most volatile fatty acids (2.4 g/L) while producing the least methane (50 mL/g VS). The immersed membrane bioreactor was successfully used to produce volatile fatty acids for 54 days.