In this study concerning denitrification, the performance of three carbon sources, methanol (MeOH), ethanol (EtOH) and gasoline-denatured ethanol (dEtOH), was compared and evaluated on the basis of treatment efficiency, inhibition potential and cost. The gasoline denaturant considered
here contained little of the components that typically boost the octane rating, such as benzene, toluene, ethylbenzene, and xylenes (BTEX). The experiment was conducted using three lab-scale SBRs operated at SRT of 12.0±0.9 days. Higher denitrification rates were obtained with dEtOH
and EtOH (14.5±0.6 and 14.9±2.4 mg NO3-N/L·h, respectively) than with MeOH (8.9±0.9 mg NO3-N/L·h). BTEX did not affect biomass production, nitrification, or denitrification. Effluent soluble COD and BTEX concentrations were always less
than the analytical detection limit. Although the cost of dEtOH (1.39/kg nitrate removed) was higher than that of methanol (1.03/kg nitrate removed), the use of dEtOH is very promising and utilities will have to decide if it is worth paying a little extra to take advantage of its benefits.
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