Application of Feedback Control Based on Dissolved Oxygen to a Fixed-Film Sequencing Batch Reactor for Treatment of Brewery Wastewater

Authors: Nguyen, Anh-Long; Duff, Sheldon J.B.; Sheppard, John D.

Source: Water Environment Research, Volume 72, Number 1, January/February 2000 , pp. 75-83(9)

Publisher: Water Environment Federation

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Abstract:

Treatment of brewery wastewater was performed using an aerobic fixed-film sequencing batch reactor using a feedback control system based on dissolved oxygen concentration in the mixed liquor. This control system was modeled after the self-cycling fermentation technique. The system was operated at 25 and 35 °C and under growthrate limiting conditions. Total biochemical oxygen demand (TBOD) removal efficiency was 83% after 3 hours at 25 °C and 92% after 1.5 to 2 hours at 35 °C. The treated effluent produced had a TBOD between 120 and 438 mg/L, with suspended solids contributing between 63 and 71% of the TBOD. Effectiveness of the treatment process might be improved if an efficient secondary clarifier was installed or if the suspended solids were removed from the brewery wastewater before treatment.

Keywords: FEEDBACK CONTROL; BREWERY WASTEWATER TREATMENT; FIXED-FILM SEQUENCING BATCH REACTOR

Document Type: Research article

DOI: 10.2175/106143000X137130

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