Jump to Main Content
Reduction of Fe(III)EDTA⁻ in a NOₓ scrubbing solution by magnetic Fe₃O₄–chitosan microspheres immobilized mixed culture of iron-reducing bacteria
- Jing, Guohua, Zhou, Jin, Zhou, Zuoming, Lin, Tianming
- Bioresource technology 2012 v.108 pp. 169-175
- bacteria, chitosan, ions, mixed culture, nitrogen oxides, pH, scrubbers, shrublands, temperature
- Magnetic Fe₃O₄–chitosan microspheres were prepared by co-precipitating of Fe²⁺ and Fe³⁺ ions with NaOH in the presence of chitosan. The saturated magnetization of the resulting material was 20.0emu/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 (NOₓ) 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 NO₂ ⁻,NO₃ ⁻,SO₃ ⁻, and S²⁻, the potential inhibition compounds in the scrubber solution, on the reduction of Fe(III)EDTA⁻ by the immobilized and free bacteria were also studied.