Performance of a hybrid-loop bioreactor system in biological treatment of 2,4,6-tri-chlorophenol containing synthetic wastewater: Effects of hydraulic residence time

EKER S., Kargi F.

JOURNAL OF HAZARDOUS MATERIALS, cilt.144, ss.86-92, 2007 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 144
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jhazmat.2006.09.084
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.86-92
  • Anahtar Kelimeler: biological treatment, hybrid loop-bioreactor, 2,4,6-tri-chlorophenol (TCP), toxicity removal, COMETABOLIC DEGRADATION, BIODEGRADATION, 2,4-DICHLOROPHENOL, CHLOROPHENOLS, TOXICITY, 2,4,6-TRICHLOROPHENOL, 4-CHLOROPHENOL, SUBSTRATE, CULTURE, REMOVAL
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A hybrid-loop bioreactor system consisting of a packed column biofilm and an aerated tank bioreactor with effluent recycle was used for biological treatment of 2,4,6-tri-chlorophenol (TCP) containing synthetic wastewater. Effects of hydraulic residence time (HRT) on COD, TCP and toxicity removal performance of the reactor were investigated for the HRT values between 5 and 30 h, while the feed COD (2700 +/- 100 mg 1(-1)), TCP (300 +/- 10 mg 1(-1)) and the solids retention time (sludge age, SRT, 20 d) were constant. Percent TCP, COD and toxicity removals increased with increasing HRT resulting in more than 90% COD, TCP and toxicity removals at HRT values above 25 h. Biomass concentrations in the packed column and in the aeration tank increased with increasing HRT resulting in low reactor TCP concentrations and therefore high TCP, COD and toxicity removals at high HRT values. Volumetric and specific rates of TCP and COD removals decreased with increasing HRT due to increased biomass and decreased flow rates at high HRT levels. Volumetric and specific removal rates of COD and TCP were maximum at an HRT of 5 h. (c) 2006 Elsevier B. V. All rights reserved.