Critical appraisal of respirometric methods for metal inhibition on activated sludge


Cokgor E., WDEMIR S., KARAHAN Ö., INSEL G., ORHON D.

JOURNAL OF HAZARDOUS MATERIALS, cilt.139, sa.2, ss.332-339, 2007 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 139 Sayı: 2
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jhazmat.2006.06.038
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.332-339
  • Anahtar Kelimeler: activated sludge, heavy metals, inhibition, oxygen uptake rate, respirometry, WASTE-WATER, OXYGEN-UPTAKE, TOXICITY, HYDROLYSIS, MICROTOX(R), SUBSTRATE, STARCH, NICKEL, YIELD
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

This paper evaluates the merit of oxygen uptake rate measurements for the assessment of metal inhibition on activated sludge. For this purpose, experiments are conducted to calculate EC50 levels of nickel and hexavalent chromium using the ISO 8192 procedure, yielding results that are highly variable and difficult to correlate, depending on the type of substrate and the initial food to microorganism ratio. Similar experiments based on continuous respitometric measurements to give the entire oxygen uptake rate profile provide a much better insight on the impact of inhibition on different biochemical processes taking place in the reactor. The results indicate that percent reduction of the amount of dissolved oxygen utilized after an appropriate reaction time is a much better index for the assessment of the inhibitory effects. (c) 2006 Elsevier B.V. All rights reserved.