Effect of wastes quality on treatment efficiency with duckweed

G. Oron, H. Willers

    Research output: Contribution to journalConference articlepeer-review

    25 Scopus citations


    Outdoor experiments with Lemna gibba (a duckweed species) grown in mini-ponds were conducted for several months during summer 1986. Duckweed was grown on two different types of wastes: (a) Digested sludge after an anaerobic phase of the settled fraction of domestic sewage mixed with the supernatant (experiment A); and (b) supernatant of domestic sewage at three different salinity levels defined by electrical conductivity (EC) (control, 4.0 dS/m and 6.6 dS/m) (experiment B). The results indicate that duckweed can grow well on a mixture of digested sludge and supernatant. Dry yield (experiment A) was in the range of 10 to 15 g/m2 per day with a protein content close to 30 percent. Effluent quality meets agricultural irrigation criteria. Duckweed growth on saline waste was mostly negatively affected when the electrical conductivity of the influent exceeded 4 dS/m.

    Original languageEnglish
    Pages (from-to)639-645
    Number of pages7
    JournalWater Science and Technology
    Issue number6-7 -7 pt 2
    StatePublished - 1 Jan 1989
    EventProceedings of the Fourteenth Biennial Conference of the International Association on Water Pollution Research and Control. Part 2 - Brighton, Engl
    Duration: 18 Jul 198821 Jul 1988

    ASJC Scopus subject areas

    • Environmental Engineering
    • Water Science and Technology


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