Biological nutrient removal (BNR) from high strength wastewater was investigated using a newly developed integrated anaerobic fluidized bed (AF) with circulating fluidized bed bioreactor henceforth called A-CFBBR. The A-CFBBR showed 99.7%COD removal, 84% nitrogen removal, with a very low sludge yield of 0.017gVSS/gCOD while treating a synthetic wastewater containing 10,700mgCOD/L and 250mg NH 3-N/L over a period of 6months. The system was operated at an organic loading rate (OLR) of 35kg COD/m 3 AFd and nitrogen loading rate (NLR) of 1.1kgN/m 3 CFBBR d at a hydraulic retention time (HRT) of less than 12h in the A-CFBBR. Microbial communities analysis using DGGE confirmed the presence of both AOBs and NOBs in the riser and downer. Pseudomonas putida and Pseudomonas fluorescence were the dominant denitrifiers present in the downer. Methanogenic activity was accomplished by a microbial mixture of archaea and bacteria in the anaerobic column.
- Biological nutrient removal
ASJC Scopus subject areas
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal