Reduction of Fe(III)EDTA(-) in a NO(x) scrubbing solution by magnetic Fe3O4-chitosan microspheres immobilized mixed culture of iron-reducing bacteria

Bioresour Technol. 2012 Mar:108:169-75. doi: 10.1016/j.biortech.2011.12.112. Epub 2011 Dec 27.

Abstract

Magnetic Fe(3)O(4)-chitosan microspheres were prepared by co-precipitating of Fe(2+) and Fe(3+) ions with NaOH in the presence of chitosan. The saturated magnetization of the resulting material was 20.0 emu/g. Then these magnetic microspheres were employed to immobilize iron-reducing bacteria to improve the biological reduction of Fe(III)EDTA(-), which was one of the key steps in nitrogen oxides (NO(x)) removal by the integrated chemical absorption-biological reduction process. The immobilized bacteria performed well on Fe(III)EDTA(-) reduction than free bacteria, even under unfavorable pH and temperatures. Furthermore, the effects of NO(2)(-), NO(3)(-), SO(3)(-), and S(2-), the potential inhibition compounds in the scrubber solution, on the reduction of Fe(III)EDTA(-) by the immobilized and free bacteria were also studied.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollution / prevention & control*
  • Bacteria / metabolism*
  • Chitosan / metabolism*
  • Edetic Acid / metabolism
  • Ferric Compounds / metabolism*
  • Hydrogen-Ion Concentration
  • Magnetics
  • Microspheres*
  • Nitrogen Oxides / metabolism*
  • Oxidation-Reduction
  • Temperature

Substances

  • Ferric Compounds
  • Nitrogen Oxides
  • ferric oxide
  • Chitosan
  • Edetic Acid
  • Fe(III)-EDTA