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

Chih-Kuei Chen, Hung-Chih Liang and Shang-Lien Lo
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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

IJERPH, 2020, vol. 17, issue 2, 1-14

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.

Keywords: activated sludge/contact aeration; oil and grease; true color; SEM; DGGE; biological phase (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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