Transient performance during start-up of a two-phase anaerobic digestion process demonstration unit treating carbohydrate-rich waste with biochar addition

• Published in: International journal of hydrogen energy 2019-05, Vol.44 (28), p.14341-14350
• Main Authors: Sunyoto, Nimas M.S., Sugiarto, Yusron, Zhu, Mingming, Zhang, Dongke
• Format: Article
• Language: English
• Subjects: Biochar; Hydrogen; Methane; Process demonstration unit; Two-phase anaerobic digestion
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2019.04.037

The paper reports an experimental investigation into the transient performance during the start-up of a pilot-scale two-phase anaerobic digestion (TPAD) process demonstration unit (PDU) treating food waste with biochar addition. Hydrogen (H2) was produced in the first phase (R1) and methane (CH4) was produced in the second phase (R2). A fed-batch operation strategy was applied to the start-up of both phases, followed by semi-continuous operation. Production rates and yields of H2 and CH4 and volatile fatty acids (VFA) were measured while the pH and temperature were monitored throughout the process. Fed-batch operation allowed microbe enrichment and gradual VFA production in both phases, which was observed to be efficient in starting up the TPAD PDU. Under semi-continuous operation, R1 produced biogas with composition up to 49% of H2 and at a yield of 46 L H2.kg −1 VS. CH4 composition and yield reached up to 59% and 301 L CH4.kg−1 VS in the R2. •Start-up of a demonstration scale of TPAD treating food waste was conducted.•Successful start-up was achieved with fed-batch followed by semicontinuous strategy.•Stable H2 production with 46 L kg−1 VS was obtained in the first phase of TPAD.•Stable CH4 production with 300 L kg−1 VS was attained in the second phase of TPAD.