Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 39, Issue 2, Pages 277-284Publisher
SPRINGER
DOI: 10.1007/s00449-015-1511-7
Keywords
Continuous-upflow biofilter; Encrustation; Nitrate-dependent Fe(II) oxidation; Nitrate removal
Funding
- National Natural Science Foundation of China (NSFC) [51008239, 51378400]
- Natural Science Foundation of Hubei Province, China [2013CFB289, 2013CFB308]
- National Twelfth Five-Year'' Plan for Science and Technology Pillar Program [2014BAL04B04, 2015BAL01B02]
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A continuous-upflow biofilter packed with sponge iron was constructed for nitrate removal under an anaerobic atmosphere. Microbacterium sp. W5, a nitrate reducing and Fe(II) oxidizing strain, was added to the biofilter as an inoculum. The best results were achieved when NO3 (-)-N concentration was 30 mg/L and Fe2+ was 800 mg/L. Nitrite in influent would inhibit nitrate removal and aqueous Fe2+ resulted in encrustation. Fe(II)EDTA would prevent cells from encrustation and the maximum nitrogen removal efficiency was about 90 % with Fe(II)EDTA level of 1100 mg/L. Nitrate reduction followed first-order reaction kinetics. Characteristics of biofilms were analyzed by X-ray fluorescence spectroscopy.
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