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

Sahinkaya E., Kilic A., Duygulu B.

WATER RESEARCH, cilt.60, ss.210-217, 2014 (SCI-Expanded, Scopus) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 60
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.watres.2014.04.052
  • Dergi Adı: WATER RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.210-217
  • Anahtar Kelimeler: Autotrophic denitrification, Post denitrification, Nitrate removal, Wastewater treatment, Elemental sulfur
  • Marmara Üniversitesi Adresli: Hayır

Özet

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 10mg NO3--N/(L.h). When the temperature decreased to 10°C during the winter time at loading of 18mg 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 40m3/d. Almost complete denitrification was attained with a nitrate loading rate of 6.25mg NO3--N/(L.h). © 2014 Elsevier Ltd.