title: Reduction of Fe(III)EDTA(-) in a NO(x) scrubbing solution by magnetic Fe3O4-chitosan microspheres immobilized mixed culture of iron-reducing bacteria.
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.
authors.affiliation: Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China. zhoujing@hqu.edu.cn
authors.forename: Guohua
authors.initials: G
authors.lastname: Jing
authors.forename: Jin
authors.initials: J
authors.lastname: Zhou
authors.forename: Zuoming
authors.initials: Z
authors.lastname: Zhou
authors.forename: Tianming
authors.initials: T
authors.lastname: Lin
mesh_terms: D000397:Air Pollution / Q000517:prevention & control*; D001419:Bacteria / Q000378:metabolism*; D048271:Chitosan / Q000378:metabolism*; D004492:Edetic Acid / Q000378:metabolism; D005290:Ferric Compounds / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008280:Magnetics; D008863:Microspheres; D009589:Nitrogen Oxides / Q000378:metabolism*; D010084:Oxidation-Reduction; D013696:Temperature
chemical_list: D005290:Ferric Compounds; D009589:Nitrogen Oxides; C000499:ferric oxide; D048271:Chitosan; D004492:Edetic Acid; C019179:Fe(III)-EDTA