Biological nitrogen removal from industrial wastewater discharged from metal recovery processes

A. Hirata, Y. Nakamura, Satoshi Tsuneda

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    The wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of acids and alkalis such as nitric acid and aqueous ammonia, and of salts such as sodium chloride and sodium sulfate. Biological nitrogen removal from this wastewater was attempted by using a circulating bioreactor system equipped with an anaerobic packed bed and an aerobic three-phase fluidized bed. As a result of acclimating microorganisms with change of the hydraulic residence time, this system effectively removed nitrogen from diluted wastewater (T-N: from 2,000 to 4,000 g/m3), such that the total nitrogen concentration in the effluent met the sewage discharge control criteria in Japan (240 g/m3). The removal ratio of total nitrogen was 90% to 98% and that of ammonia was 80% to 92%. In addition, the characteristics equations for biological treatment were applied to this system on the assumption that both reactions of denitrification in the anaerobic reactor and nitrification in the aerobic reactor can be approximated to a first-order reaction. This simplified approach successfully led to a new analytical method for simulating the optimum volume ratio of anaerobic reactor to aerobic reactor for minimizing the total hydraulic residence time.

    Original languageEnglish
    Pages (from-to)171-179
    Number of pages9
    JournalWater Science and Technology
    Volume44
    Issue number2-3
    Publication statusPublished - 2001

    Fingerprint

    Metal recovery
    Nitrogen removal
    Wastewater
    Nitrogen
    wastewater
    Ammonia
    nitrogen
    metal
    Hydraulics
    residence time
    Sodium sulfate
    Nitrification
    ammonia
    Denitrification
    Industrial wastes
    Packed beds
    Sodium chloride
    Nitric acid
    Sewage
    Precious metals

    Keywords

    • Biological nitrogen removal
    • Denitrification
    • Metal recovery process
    • Nitrification

    ASJC Scopus subject areas

    • Water Science and Technology

    Cite this

    Biological nitrogen removal from industrial wastewater discharged from metal recovery processes. / Hirata, A.; Nakamura, Y.; Tsuneda, Satoshi.

    In: Water Science and Technology, Vol. 44, No. 2-3, 2001, p. 171-179.

    Research output: Contribution to journalArticle

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