A laboratory staged anaerobic fluidized membrane bioreactor (SAF-MBR) system was applied to the treatment of primary clarifier effluent from a domestic wastewater treatment plant with temperature decreasing from 25 to 10 °C. At all temperatures and with a total hydraulic retention time of 2.3 h, overall chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) removals were 89% and 94% or higher, with permeate COD and BOD5 of 30 and 7 mg/L or lower, respectively. No noticeable negative effects of low temperature on organic removal were found, although a slight increase to 3 mg/L in volatile fatty acids concentrations in the effluent was observed. Biosolids production was 0.01–0.03 kg volatile suspended solids/kg COD, which is far less than that with aerobic processes. Although the rate of trans-membrane pressure at the membrane flux of 9 L/m2/h increased as temperature decreased, the SAF-MBR was operated for longer than 200 d before chemical cleaning was needed. Electrical energy potential from combustion of the total methane production (gaseous and dissolved) was more than that required for system operation.
Effect of temperature on the treatment of domestic wastewater with a staged anaerobic fluidized membrane bioreactor
R. H. Yoo, J. H. Kim, P. L. McCarty, J. H. Bae; Effect of temperature on the treatment of domestic wastewater with a staged anaerobic fluidized membrane bioreactor. Water Sci Technol 1 March 2014; 69 (6): 1145–1150. doi: https://doi.org/10.2166/wst.2013.793
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