Isolation and characterization of sulfur-utilizing denitrifiers from the sulfur-oxidizing denitrification process

Of 14 potential sulfur-oxidizing strains, Pseudomonas sp. B21 and Agrobacterium sp. B19 were considered as denitrifiers. Under aerobic conditions, with S0 as electron donor, maximum cell growth rates were 0.022 (B21) and 0.043 h-1 (B19). Both grew optimally at pH 7.5 and 28 C. When NO3-N was increas...

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Bibliographic Details
Published in:Biotechnology letters 2003-10, Vol.25 (19), p.1605-1608
Main Authors: Tian, D, Shon, H.K, Chun, D.J, Jin, C.S, Gwon, E.M, Chung, W.J
Format: Article
Language:English
Subjects:
Aerobic conditions
Agrobacterium
Bacteria
Bioreactors - microbiology
Cell Culture Techniques - methods
cell growth
denitrification
denitrifying microorganisms
Hydrogen-Ion Concentration
nitrate
nitrate nitrogen
nitrates
Nitrates - metabolism
Nutrient removal
Organic compounds
Oxidation-Reduction
Oxygen Consumption - physiology
Pseudomonas
Pseudomonas - classification
Pseudomonas - growth & development
Pseudomonas - isolation & purification
Pseudomonas - metabolism
Rhizobium - classification
Rhizobium - growth & development
Rhizobium - isolation & purification
Rhizobium - metabolism
Species Specificity
Sulfur
Sulfur Compounds - metabolism
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Summary:Of 14 potential sulfur-oxidizing strains, Pseudomonas sp. B21 and Agrobacterium sp. B19 were considered as denitrifiers. Under aerobic conditions, with S0 as electron donor, maximum cell growth rates were 0.022 (B21) and 0.043 h-1 (B19). Both grew optimally at pH 7.5 and 28 C. When NO3-N was increased from 10 to 200 mg l-1 the efficiency of nitrate removal of each strain gradually decreased, from 60 to 40%. Addition of suitable organic compounds (C/N < 4.2) increased the nitrate removal efficiencies of both strains, indicating their mixotrophic characters.
ISSN:0141-5492
1573-6776
DOI:10.1023/A:1025678914181