Abstract
A novel wastewater treatment configuration—the Baffled Bioreactor (BBR)—was tested for municipal wastewater treatment at pilot-scale. This patented BBR is characterized by a hydraulically driven sludge recycling mechanism in the aerobic zone that eliminates the need for sludge return from a final clarifier, which significantly reduces the overall maintenance needs. Throughout 2009, a pilot-scale BBR with a total effective volume of 8.1 m3 (2,153 gallons) was operated at the Southeast Wastewater Treatment Plant in Rolla, Missouri. An annual average mixed-liquor suspended-solids (MLSS) concentration of 3.2 g/L was maintained in the aerobic zone without a return pump. During the summer, the treatment capacity reached 37.9 m3/d (10,000 gpd), with average effluent concentrations of BOD5, SS, and NH4+-N of lower than 10 mg/L, 10 mg/L, and 1 mg/L, respectively. At 37.9 m3/d (10,000 gpd), the total hydraulic retention time in the anoxic and aerobic zones was approximately 4.5 h. However, a significant redu...
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