Pilot and full scale applications of sulfur-based autotrophic denitrification process for nitrate removal from activated sludge process effluent


ŞAHİNKAYA E. , Kilic A., Duygulu B.

WATER RESEARCH, vol.60, pp.210-217, 2014 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 60
  • Publication Date: 2014
  • Doi Number: 10.1016/j.watres.2014.04.052
  • Title of Journal : WATER RESEARCH
  • Page Numbers: pp.210-217

Abstract

Sulfur-based autotrophic denitrification of nitrified activated sludge process effluent was studied in pilot and full scale column bioreactors. Three identical pilot scale column bioreactors packed with varying sulfur/lime-stone ratios (1/1-3/1) were setup in a local wastewater treatment plant and the performances were compared under varying loading conditions for long-term operation. Complete denitrification was obtained in all pilot bioreactors even at nitrate loading of 10 mg NO3--N/(L.h). When the temperature decreased to 10°C during the winter time at loading of 18 mg NO3--N/(L.h), denitrification efficiency decreased to 60-70% and the bioreactor with S/L ratio of 1/1 gave slightly better performance. A full scale sulfur-based autotrophic denitrification process with a S/L ratio of 1/1 was set up for the denitrification of an activated sludge process effluent with a flow rate of 40 m3/d. Almost complete denitrification was attained with a nitrate loading rate of 6.25 mg NO3--N/(L.h).

Sulfur-based autotrophic denitrification of nitrified activated sludge process effluent was studied in pilot and full scale column bioreactors. Three identical pilot scale column bioreactors packed with varying sulfur/lime-stone ratios (1/1-3/1) were setup in a local wastewater treatment plant and the performances were compared under varying loading conditions for long-term operation. Complete denitrification was obtained in all pilot bioreactors even at nitrate loading of 10 mg NO3--N/(L.h). When the temperature decreased to 10 degrees C during the winter time at loading of 18 mg NO3--N/(L.h), denitrification efficiency decreased to 60-70% and the bioreactor with S/L ratio of 1/1 gave slightly better performance. A full scale sulfur-based autotrophic denitrification process with a S/L ratio of 1/1 was set up for the denitrification of an activated sludge process effluent with a flow rate of 40 m(3)/d. Almost complete denitrification was attained with a nitrate loading rate of 6.25 mg NO3--N/(L.h). (C) 2014 Elsevier Ltd. All rights reserved.