Iron oxidation in a ceramic membrane bioreactor using acidophilic bacteria isolated from an acid mine drainage

Demir E. K., Nural Yaman B., Aytar Çelik P., Şahinkaya E.

JOURNAL OF WATER PROCESS ENGINEERING, cilt.38, ss.101610, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.jwpe.2020.101610
  • Dergi Adı: JOURNAL OF WATER PROCESS ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.101610
  • Anahtar Kelimeler: Ceramic membrane bioreactor, Membrane bioreactor, Acidophilic iron oxidation, Acid mine drainage, LEPTOSPIRILLUM-FERRIPHILUM, KINETICS, PRECIPITATION, FERROOXIDANS, RECOVERY, JAROSITE, PH
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

This study aims at investigating the iron oxidation and filtration performances of a ceramic membrane bioreactor (CMBR) inoculated with a mixed culture of iron-oxidizing acidophilic bacteria isolated from a real acid mine drainage (AMD). The CMBR was fed with a synthetic solution containing 1400 mg/L Fe2+ at pH 1.5-2.5. High iron oxidation performances (around 97%) at HRT range of 48-12 h were observed. Further decreasing HRT to 6 h led to significant decrease in the Fe2+ oxidation performances. CMBR was operated at varying fluxes. Significant fouling was not observed provided that flux was 5 LMH or lower. The mixed culture was composed of Acidiphilium cryptum and Alicyclobacillus cycloheptanicus. In addition to continuous flow experiments in CMBR, Fe2+ oxidation experiments were conducted under batch conditions. Oxidation kinetics well fitted Monod equation with a specific maximum iron oxidation rate and half-saturation constant of around 3.35 mg-Fe2+/(gVSS.min) and 549 mg/L, respectively.