The stability of anaerobic digesters operating on a food-processing wastewater

F. R. Hawkes*, A. Rozzi, K. Black, A. Guwy, D. L. Hawkes

*Corresponding author for this work

    Research output: Contribution to journalConference articlepeer-review

    22 Citations (Scopus)


    The response to step overloads of laboratory-scale contact process and UASB reactors and a pilot-scale anaerobic filter is examined. The reactors were operated on ice-cream waste water and changes in operational parameters including VFA levels and COD reduction were monitored. In the laboratory-scale experiments, feed strength was increased from 4500 to 22,000 mg [O] per litre for periods of 2 to 12 hours in contact process and one and two-stage UASB reactors. UASB stability was improved by supplementing with trace metals. Two-stage UASB's gave better COD removals under shock loading than single-stage UASB's or contact process reactors. In an 8 hour step overload experiment on the pilot-scale reactor, bicarbonate alkalinity was shown to be a good indicator of instability.

    Original languageEnglish
    Pages (from-to)73-82
    Number of pages10
    JournalWater Science and Technology
    Issue number7
    Publication statusPublished - 1992
    EventProceedings of the 6th International Symposium on Anaerobic Digestion - Sao Paulo, Braz
    Duration: 12 May 199116 May 1991


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