Influence of temperature on denitrification of an industrial high-strength nitrogen wastewater in a two-sludge system

  • J Carrera
  • T Vicent
  • FJ Lafuente


The temperature effect on denitrification rate of a two-sludge system has been studied. An industrial high-strength wastewater and an industrial by-product containing mainly methanol, as external carbon source, were used in this study. The maximum denitrification rate (MDR) was determined at six different temperatures: 6, 8, 10, 15, 20 and 25oC in batch mode. The temperature coefficient was found to be 1.10 + 0.01 at temperatures between 10 to 25oC and 1.37 + 0.01 at temperatures between 6 to 10oC. The MDR obtained in the two-sludge system (0.28 mg VSS-1.d-1 at 25oC) was higher than the one obtained in a single-sludge system with a similar external carbon source. The COD/N ratio required for complete denitrification in the two-sludge system was approximately stoichiometric, which is 3.7 + 0.9 mg N-1.

Water SA Vol.29(1) 2003: 11-16

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eISSN: 0378-4738