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

Duu-Jong Lee; Biing-Teo Wong

doi:10.1016/j.biortech.2014.05.099

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

Duu-Jong Lee
, Biing-Teo Wong

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

38 Citations (Scopus)

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. © 2014 Elsevier Ltd.

Original language	English
Pages (from-to)	616-619
Journal	Bioresource Technology
Volume	166
DOIs	https://doi.org/10.1016/j.biortech.2014.05.099
Publication status	Published - Aug 2014
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Inhibition
Mixotrophic denitrification
Nitroso compounds
Sulfide

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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 (S2-), rather than the previously proposed mechanism by direct reaction between nitric oxide (NO) and S2-. 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. {\textcopyright} 2014 Elsevier Ltd.",

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AU - Lee, Duu-Jong

AU - Wong, Biing-Teo

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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N2 - 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 (S2-), rather than the previously proposed mechanism by direct reaction between nitric oxide (NO) and S2-. 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. © 2014 Elsevier Ltd.

AB - 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 (S2-), rather than the previously proposed mechanism by direct reaction between nitric oxide (NO) and S2-. 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. © 2014 Elsevier Ltd.

KW - Inhibition

KW - Mixotrophic denitrification

KW - Nitroso compounds

KW - Sulfide

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DO - 10.1016/j.biortech.2014.05.099

M3 - RGC 21 - Publication in refereed journal

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SN - 0960-8524

VL - 166

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JO - Bioresource Technology

JF - Bioresource Technology

ER -

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

Abstract

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Research Keywords

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