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• W3161393773 abstract "The anaerobic digestion technology can produce combustible biogas and liquid fertilizer from waste biomass such as livestock manures and agricultural residues. However, excessive pretreatment of raw biomass and high loading operation to improve fermentation efficiency often cause environmentally fatal change in the anaerobic reactor and brake the balance of microbial community then result in the accumulation of propionate. Propionate is one of organic acids produced intermediately in anaerobic digestion process and decompose more slowly than other intermediate products. Since accumulation of propionate cause to lower pH and stop whole fermentation reaction, it is desirable to avoid its accumulation or reduce the concentration promptly.Microbial fuel cells (MFC) has been developed to produce electricity using anaerobic bacteria from organic wastewater. MFC dominated with anaerobically digested slurry as a bacterial source can generate electricity by consuming propionate in culturing media, while the process of decomposition has not been reported yet minutely. The purpose of this report is to clarify the consumption characteristics of propionate in MFC comparing with ordinary anaerobic digestion process. The experimental reactor prototyped of acrylic transparent plate has one chamber with 33.8cm3 in volume. The chamber was filled with 13g of activated carbon granules and separated the anode and the air cathode with polyurethane sponge. Anode and cathode were connected with a lead wire through the electric resistance of 100 ohm for MFC. Bacterial source supplied to the reactor was collected in the mud of paddy field. Feed solution including propionate as substrate was replaced every day. Acclimation method were set at 4 conditions as follows: gradually increasing substrate (acetate or propionate) concentration from 1.2 to 12 mmol/L for 7 days (Ac rise, Pr rise) and keep constant substrate (acetate or propionate) concentration of 12 mmol/L for 7 days (Ac const., Pr const.). The condition using acetate were operated as control. Electricity generated in MFC was logged every 30 seconds and observe the consumption rate of propionate and electricity generation in the consumption experiment.As a result, electric energy at day 7 the day that 12 mmol/L was added under all conditions was 0.25±0.18 kJ/m2 (Ac rise), 0.60±0.26 kJ/m2 (Ac const.), 3.00±0.51 kJ/m2 ( Pr rise) and 6.45±1.26 kJ/m2 (Pr const.) respectively. At the same time, measured remained propionate was 11.86±0.08 mmol/L (Pr rise) and 11.67±0.08 mmol/L (Pr const.). From these results, keep constant 12 mmol/L of propionate addition is proper acclimation method compared with gradually increasing way." @default.
• W3161393773 created "2021-05-24" @default.
• W3161393773 creator A5086626494 @default.
• W3161393773 date "2018-01-01" @default.
• W3161393773 modified "2023-09-28" @default.
• W3161393773 title "RE1-4 : Consumption characteristics of propionate in anaerobic digestate using microbial fuel cells" @default.
• W3161393773 hasPublicationYear "2018" @default.
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