Low energy single-staged anaerobic fluidized bed ceramic membrane bioreactor (AFCMBR) for wastewater treatment

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>An aluminum dioxide (Al<SUB>2</SUB>O<SUB>3</SUB>) ceramic membrane was used in a single-stage anaerobic fluidized bed ceramic membrane bioreactor (AFCMBR) for low-strength wastewater treatment. The AFCMBR was operated continuously for 395days at 25°C using a synthetic wastewater having a chemical oxygen demand (COD) averaging 260mg/L. A membrane net flux as high as 14.5–17L/m<SUP>2</SUP> h was achieved with only periodic maintenance cleaning, obtained by adding 25mg/L of sodium hypochlorite solution. No adverse effect of the maintenance cleaning on organic removal was observed. An average SCOD in the membrane permeate of 23mg/L was achieved with a 1h hydraulic retention time (HRT). Biosolids production averaged 0.014±0.007gVSS/gCOD removed. The estimated electrical energy required to operate the AFCMBR system was 0.039kWh/m<SUP>3</SUP> <SUB>,</SUB> which is only about 17% of the electrical energy that could be generated with the methane produced.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ceramic membrane was applied in anaerobic fluidized MBR for low-strength wastewater. </LI> <LI> Membrane net flux of 17LMH was achieved with only periodic maintenance cleaning. </LI> <LI> No adverse effect of the maintenance cleaning on organic removal was observed. </LI> <LI> Average SCOD in membrane permeate of 23mg/L was achieved. </LI> <LI> Electrical energy required to operate the AFCMBR was only about 0.038kWh/m<SUP>3</SUP>. </LI> </UL> </P>