Nitrogen removal in a SBR operated with and without pre-denitrification: effect of the carbon: nitrogen ratio and the cycle time

作者：Rodrigues Mees Juliana Bortoli; Gomes Simone Damasceno; Hasan Salah Din Mahmud; Gomes Benedito Martins; Vilas Boas Marcio Antonio

来源：Environmental Technology, 2014, 35(1): 115-123.

DOI：10.1080/09593330.2013.816373

• post-treatment
• nutrient removal
• nitrification
• denitrification
• slaughterhouse wastewater

The effects of cycle time (CT) (8, 12 and 16h) and C/N ratio (3, 6 and 9) on nitrogen removal efficiencies in a bench top sequencing batch reactor treating slaughterhouse wastewater were investigated under different operating conditions: in condition I, the reaction comprises an aerobic/anoxic phase and in condition II, the reaction comprises anoxic I/aerobic/anoxic II phases (with pre-denitrification). The greatest percentages of nitrogen removal were obtained in the CT range from 12 to 16h and C/N ratios from 3 to 6, with mean efficiency values of 80.76% and 85.57% in condition I and 90.99% and 91.09% in condition II. Although condition II gave a higher removal of total inorganic nitrogen (NH4+-N+NO2--N+NO3--N) than condition I, only condition I showed statistically significant and predictive regression for all the steps of nitrogen removal.

• 出版日期2014-1-2