Serial CSTR digester configuration for improving biogas production from manure

Kanokwan Boe, Irini Angelidaki

    Research output: Contribution to journalJournal articleResearchpeer-review


    A new configuration of manure digesters for improving biogas production has been investigated in laboratory scale. A single thermophilic continuous-flow stirred tank reactor (CSTR) operated with a hydraulic retention time (HRT) of 15 days was compared to a serial CSTR configuration with volume distribution ratio of 80/20 and 90/10, and total HRT of 15 days. The results showed that the serial CSTR could obtain 11% higher biogas yield compared to the single CSTR. The increased biogas yield in the serial CSTR was mainly from the second reactor, which accounted for 16% and 12% of total biogas yield in the 90/10 and 80/20 configuration, respectively. VFA concentration in the serial CSTR was high in the first reactor but very low in the second reactor. The results from organic pulse load test showed that the second reactor in serial CSTR helped utilizing VFA produced from overloading in the first reactor, which improved the effluent quality and conversion efficiency of the serial CSTR.
    Original languageEnglish
    JournalWater Research
    Issue number1
    Pages (from-to)166-172
    Publication statusPublished - 2009


    • Manure digester
    • Anaerobic digestion
    • Biogas
    • Serial CSTR configuration


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