Denitrifying sulfide removal and nitrososulfide complex: Azoarcus sp. NSC3 and Pseudomonas sp. CRS1 mix
Journal
Bioresource Technology
Journal Volume
166
Pages
616-619
Date Issued
2014
Author(s)
Wong B.-T.
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. © 2014 Elsevier Ltd.
Subjects
Inhibition; Mixotrophic denitrification; Nitroso compounds; Sulfide
SDGs
Other Subjects
Bacteria; Denitrification; Enzyme inhibition; Nitric oxide; Denitrifying sulfide removal; Direct reactions; Elemental sulfur; Functional strain; Mixotrophic denitrifications; Mixotrophic growths; Nitroso compounds; Sulfide; Sulfur compounds; nitric oxide; nitrogen; nitroprusside sodium; nitrososulfide; organosulfur derivative; sulfide; sulfur; sulfur derivative; unclassified drug; sulfide; bacterium; biotechnology; denitrification; inhibition; mixotrophy; nitrogen cycle; pollutant removal; sulfide; article; autotrophy; Azoarcus; bacterial strain; chemical oxygen demand; chemoautotrophy; controlled study; denitrification; denitrifying sulfide removal; heterotrophy; metabolism; mixotrophic growth; mixotrophy; nitrogen cycle; priority journal; Pseudomonas; Azoarcus; bioreactor; chemistry; denitrification; metabolism; procedures; Pseudomonas; water management; Azoarcus sp.; Pseudomonas sp.; Azoarcus; Bioreactors; Denitrification; Nitroprusside; Pseudomonas; Sulfides; Water Purification
Type
journal article