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Updated: Feb 28, 2026
Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Long-term bio-H2 and bio-CH4 production from food waste in a continuous two-stage system: Energy efficiency and
Dalal E Algapani1, Wei Qiao2, Francesca di Pumpo3
1Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China; College of Agricultural Technology and Fish Science, Al-Neelain University, Khartoum, Sudan.
Abstract:
Anaerobic digestion is a well-established technology for treating organic waste, but it is still under challenge for food waste due to process stability problems. In this work, continuous H2 and CH4 production from canteen food waste (FW) in a two-stage system were successfully established by optimizing process parameters. The optimal hydraulic retention time was 5d for H2 and 15d for CH4. Overall, around 59% of the total COD in FW was converted into H2 (4%) and into CH4 (55%). The fluctuations of FW characteristics did not significantly affect process performance. From the energy point view, the H2 reactor contributed much less than the methane reactor to total energy balance, but it played a key role in maintaining the stability of anaerobic treatment of food waste. Microbial characterization indicated that methane formation was through syntrophic acetate oxidation combined with hydrogenotrophic methanogenesis pathway.
