Topic
Nitrite
About: Nitrite is a research topic. Over the lifetime, 15425 publications have been published within this topic receiving 484581 citations.
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TL;DR: The nitrogen-removal performance was significantly improved after incorporating the FA approach, and the NOB population and activity after implementing FA treatment was less than 5% of those without FA treatment, suggesting the washout of NOB.
Abstract: Biological nitrogen removal through the nitrite pathway (NH4+→NO2-→N2) is favorable for the wastewater treatment plants without sufficient carbon source. This study demonstrates an innovative approach for attaining the nitrite pathway based on sludge treatment using free ammonia (FA i.e. NH3). This approach is based on our innovative discovery in this study that FA at 210 mg NH3-N/L is far less biocidal to ammonium oxidizing bacteria (AOB) than to nitrite oxidizing bacteria (NOB). Twenty-two percent of the activated sludge from the sequencing batch reactor (SBR) receiving synthetic domestic wastewater was treated in an FA treatment unit at 210 mg NH3-N/L for one day. The FA treated sludge was afterwards recirculated back to the SBR. A nitrite accumulation ratio of above 90% was quickly achieved (in 40 d) and maintained stable in the SBR, indicating the establishment of the nitrite pathway. The NOB population and activity after implementing FA treatment was less than 5% of those without FA treatment, sugge...
169 citations
TL;DR: The reaction between nitrite and hemoglobin has been studied for over a century, but recent evidence indicating nitrite is a latent vasodilatory agent that can be activated by its reaction with deoxyhemoglobin has led to renewed interest in this reaction.
169 citations
TL;DR: The results suggest that 2-nitrotoluene is subject to initial attack by a dioxygenase enzyme that forms 3-methylcatechol with concomitant release of nitrite, which is subsequently degraded via the meta ring fission pathway.
Abstract: A strain of Pseudomonas sp. was isolated from nitrobenzene-contaminated soil and groundwater on 2-nitrotoluene as the sole source of carbon, energy, and nitrogen. Bacterial cells growing on 2-nitrotoluene released nitrite into the growth medium. The isolate also grew on 3-methylcatechol, 4-methylcatechol, and catechol. 2-Nitrotoluene, 3-methylcatechol, and catechol stimulated oxygen consumption by intact cells regardless of the growth substrate. Crude extracts from the isolate contained catechol 2,3-dioxygenase and 2-hydroxy-6-oxohepta-2,4-dienoate hydrolase activity. The results suggest that 2-nitrotoluene is subject to initial attack by a dioxygenase enzyme that forms 3-methylcatechol with concomitant release of nitrite. The 3-methylcatechol is subsequently degraded via the meta ring fission pathway.
169 citations
TL;DR: Genes for nitrite- and NO-reductase but not N(2)O or nitrate reductase are present in the genome of Nitrosomonas.
168 citations
TL;DR: Biological nitrogen removal systems should be optimized to promote complete denitrification to minimize NO(2)(-) and NH(4)(+) accumulation.
168 citations