Effects of Low Oxygen Dosages on an Anaerobic Membrane Bioreactor, Simulating the Oxygen Load in an Anaerobic Digester-Dissolved Air Flotation (AD-DAF) System.

ABSTRACT: This study reports the effects of microaeration on a laboratory-scale AnMBR (MA-AnMBR) fed with synthetic concentrated domestic sewage. The imposed oxygen load mimics the oxygen load coming from a dissolved air flotation (DAF) unit, establishing an anaerobic digester-DAF (AD-DAF) combination with sludge recycling. Results showed a reduced COD concentration in the MA-AnMBR permeate compared with the AnMBR permeate, from 90 to 74 mgCOD L^-1, and a concomitant 27% decrease in biogas production. The MA-AnMBR permeate ammonium (NH₄⁺) concentration increased by 35%, to 740 mgNH₄⁺-N L^-1, indicating a rise in the hydrolytic capacity. Furthermore, the MA-AnMBR biomass seemingly adapted to an increased oxygen load, which corresponded t

SUBMITTER: Piaggio AL 

PROVIDER: S-EPMC10714394 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature