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Bioresour Technol. 2014 Aug;166:616-9. doi: 10.1016/j.biortech.2014.05.099. Epub 2014 Jun 2.

Denitrifying sulfide removal and nitrososulfide complex: Azoarcus sp. NSC3 and Pseudomonas sp. CRS1 mix.

Author information

1
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan. Electronic address: djlee@ntu.edu.tw.
2
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.

Abstract

Denitrifying sulfide removal (DSR) process simultaneously removes nitrate, sulfide and organic matters in the same reactor. This study applied Azoarcus sp. NSC3 and Pseudomonas sp. CRS1 mix for DSR tests in autotrophic, heterotrophic and mixotrophic growths. Negligible NO-compounds were noted in heterotrophic or mixotrophic growths, while most cells were damaged and bound with NO-compounds in autotrophic growth. Nitroprusside (SNP) ions were applied as model compound to reveal the formation of nitrososulfide complex (RSNO) by nitroso (NO(+)) and excess sulfide (S(2-)), rather than the previously proposed mechanism by direct reaction between nitric oxide (NO) and S(2-). We speculated that RSNO was then abiotically decomposed to NO and elemental sulfur in the presence of biological cells. A revised nitrogen cycle considering interactions with sulfur compounds was proposed. We also speculated that SNO and NO were inhibitory to the functional strains, whose efficient removals were essential to reach high-rate DSR performance.

KEYWORDS:

Inhibition; Mixotrophic denitrification; Nitroso compounds; Sulfide

PMID:
24929301
DOI:
10.1016/j.biortech.2014.05.099
[Indexed for MEDLINE]
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