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Application of Feedback Control Based on Dissolved Oxygen to a Fixed‐Film Sequencing Batch Reactor for Treatment of Brewery Wastewater
Author(s) -
Nguyen AnhLong,
Duff Sheldon J.B.,
Sheppard John D.
Publication year - 2000
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143000x137130
Subject(s) - clarifier , sequencing batch reactor , effluent , wastewater , chemical oxygen demand , suspended solids , sewage treatment , biochemical oxygen demand , batch reactor , total suspended solids , pulp and paper industry , bioreactor , mixed liquor suspended solids , waste management , volatile suspended solids , chemistry , oxygen , environmental science , activated sludge , environmental engineering , engineering , biochemistry , organic chemistry , catalysis
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.