Publications by authors named "Akito Ohtsu"
A submerged anaerobic membrane bioreactor (SAnMBR) was used in the treatment of real municipal wastewater at operation temperatures ranging from 15 °C to 25 °C and hydraulic retention time (HRT) of 6 h. The treatment process was evaluated in terms of organic removal efficiency, biogas production, sludge growth and membrane filtration. During long-term operation, the SAnMBR achieved chemical oxygen demand removal efficiencies of about 90% with a low sludge yield (0.
View Article and Find Full Text PDFA 20 L hollow-fiber submerged anaerobic membrane bioreactor (SAnMBR) was used to treat real domestic wastewater at 25 °C with hydraulic retention times (HRTs) ranging from 4 to 12 h. The process performance was evaluated by organic removal efficiency, biogas production, sludge yield, and filtration behaviors during one-year's operation. For HRTs ranging between 6 and 12 h, the AnMBR showed good organic removal efficiency with chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal efficiencies of about 89% and 93%, respectively.
View Article and Find Full Text PDFArticle Synopsis
- Pore size plays a crucial role in the efficiency of membrane bioprocesses for treating municipal wastewater, as demonstrated by two anaerobic membrane bioreactors (AnMBRs) with different pore sizes.
- Both AnMBRs achieved high organic removal rates, with approximately 89% removal of COD and 93% of BOD, and produced significant biogas with around 75% methane content.
- The filtration behavior varied between the two AnMBRs, with the 0.4 μm membrane having a better permeate flux and lower filtration resistance compared to the 0.05 μm membrane, though the latter required more intensive cleaning to maintain efficiency.