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


Demir E. K. , NURAL YAMAN B., Çelik P. A. , Sahinkaya E.

Journal of Water Process Engineering, cilt.38, 2020 (SCI Expanded İndekslerine Giren Dergi) identifier

  • Cilt numarası: 38
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.jwpe.2020.101610
  • Dergi Adı: Journal of Water Process Engineering

Özet

© 2020 Elsevier LtdThis 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+/(g-VSS.min) and 549 mg/L, respectively.