Dependence of enhanced biological nitrogen removal on carbon to nitrogen and rbCOD to sbCOD ratios during sewage treatment in sequencing batch reactor

摘要

Carbon to nitrogen ratio (C/N) is not the lone limiting factors in biological nutrient removal from municipal wastewaters, but readily biodegradable to slowly biodegradable COD ratio (rbCOD/sbCOD) inter alia governs the process of nutrient removal. An intermittent aeration pre-anoxic sequencing batch reactor was operated at C/N ratio of 3, 7.5, and 10 and at rbCOD/sbCOD ratios of 0.1, 0.25, and 0.5 at different sludge internal recirculation ratios. The increasing trend in nitrogen removal was observed with above mentioned operating parameters.