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Feasibility Study of Activated Sludge/Contact Aeration Combined System Treating Oil-Containing Domestic Sewage

Author

Listed:
  • Chih-Kuei Chen

    (Department of Evironmental Engineering, National Ilan University, Yilan 260, Taiwan)

  • Hung-Chih Liang

    (Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan)

  • Shang-Lien Lo

    (Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan)

Abstract

Both activated sludge/contact aeration (AS/CA) and AS-only systems for treating oil-containing domestic sewage were tested. The results of these tests indicate that the oil and grease removal ratios of the AS/CA system exceeded those of the AS-only system. When the influent oil and grease concentration reached 60 mg/L, the effluent concentration of the AS system was 13 mg/L, which exceed 10 mg/L, the Taiwan Effluent Standard for oil and grease. However, in the AS/CA system, the effluent oil and grease concentration was 8 mg/L, which was below the required standard. This study analyzes the biological phases of the AS-only system and the combined AS/CA system using a scanning electronic microscope and a denatured gradient gel electrophoresis method when the inflow concentration of oil and grease is increased to 120 mg/L. The results of the Chemical Oxygen Demand (COD) experiment reveal that the AS/CA system is affected less than the AS system, and the COD removal rate of the AS/CA system is maintained at 81%, which exceeds that (61.5%) of the AS-only system. The analytical results thus obtained suggest that both the amounts of biological phase and the biomass in the combined AS/CA system exceed those of an AS-only system.

Suggested Citation

  • Chih-Kuei Chen & Hung-Chih Liang & Shang-Lien Lo, 2020. "Feasibility Study of Activated Sludge/Contact Aeration Combined System Treating Oil-Containing Domestic Sewage," IJERPH, MDPI, vol. 17(2), pages 1-14, January.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:2:p:544-:d:308845
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