Pilot-scale thermophilic anaerobic treatment of wastewaters from seasonal vegetable processing industry

J. A. Rintala, S. S. Lepistö

    Research output: Contribution to journalArticleScientificpeer-review

    20 Citations (Scopus)

    Abstract

    Thermophilic anaerobic treatment of food industry wastewaters was studied using a 0.65 m3 upflow anaerobic sludge bed (UASB) reactor. The reactor was operated at 55°C and placed on the premises of a factory manufacturing deep-frozen goods from vegetables. The hot (> 80-90°C) and concentrated (COD 14-79 g/l wastewater streams, deriving from steam peeling and blanching of carrot and potato were used. The UASB reactor was inoculated with a small amount of granular sludge from a full-scale mesophilic UASB reactor. Prior to inoculation, the inoculum was acclimated to 55°C for 2 days. The reactor was fed with a mixture of wastewaters diluted to the desired COD. The reactor was started with loading rates of about 1.2 kg COD/m3 d. After the initial acidification of the process, apparently due to insufficient buffer capacity, the COD removal started to improve and reached 60% within 35 days of inoculation. At the end of the 70 days run, more than 80% COD removal was achieved with loading rates of about 4 kg COD/m3 d. The pilot-study run was limited due to the end of the seasonal production in the target factory. The results of the pilot study together with the results from the intensive laboratory studies suggest the feasibility of thermophilic anaerobic treatment for the studied wastewaters.

    Translated title of the contributionPilot-scale thermophilic anaerobic treatment of wastewaters from seasonal vegetable processing industry
    Original languageEnglish
    Pages (from-to)279-285
    Number of pages7
    JournalWater Science and Technology
    Volume36
    Issue number2-3
    DOIs
    Publication statusPublished - 1997
    Publication typeA1 Journal article-refereed

    Keywords

    • Anaerobic treatment
    • Pilot-scale
    • Thermophilic
    • UASB
    • Vegetable processing wastewater

    Publication forum classification

    • No publication forum level

    ASJC Scopus subject areas

    • Water Science and Technology

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