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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: A new strategy to wash out both the Nitrospira sp.
Abstract: Stable nitritation is a critical bottleneck for achieving autotrophic nitrogen removal using the energy-saving mainstream deammonification process. Herein we report a new strategy to wash out both the Nitrospira sp. and Nitrobacter sp. from the treatment of domestic-strength wastewater. The strategy combines sludge treatment using free nitrous acid (FNA) with dissolved oxygen (DO) control in the nitritation reactor. Initially, the nitrifying reactor achieved full conversion of NH4+ to NO3−. Then, nitrite accumulation at ~60% was achieved in the reactor when 1/4 of the sludge was treated daily with FNA at 1.82 mg N/L in a side-stream unit for 24 h. Fluorescence in-situ hybridization (FISH) revealed FNA treatment substantially reduced the abundance of nitrite oxidizing bacteria (NOB) (from 23.0 ± 4.3 to 5.3 ± 1.9%), especially that of Nitrospira sp. (from 15.7 ± 3.9 to 0.4 ± 0.1%). Nitrite accumulation increased to ~80% when the DO concentration in the mainstream reactor was reduced from 2.5–3.0 to 0.3–0.8 mg/L. FISH revealed the DO limitation further reduced the abundance of NOB (to 2.1 ± 1.0%), especially that of Nitrobacter sp. (from 4.9 ± 1.2 to 1.8 ± 0.8%). The strategy developed removes a major barrier for deammonification in low-strength domestic wastewater.
132 citations
TL;DR: It is demonstrated that S1 was effective for nitrogen removal in industrial wastewater containing heavy metal and different forms of nitrogen source could be utilize in simultaneous nitrification and denitrification.
132 citations
TL;DR: Results indicate that orally ingested nitrite can be an alternative to L-arginine as a source of NO in vivo and may explain, at least in part, the mechanism of the nitrite/nitrate-rich Dietary Approaches to Stop Hypertension diet-induced hypotensive effects.
Abstract: In this study, we investigated whether orally administered nitrite is changed to NO and whether nitrite attenuates hypertension in a dose-dependent manner. We utilized a stable isotope of [15N]nitr...
132 citations
TL;DR: An amperometric nitrite sensor based on a polymeric nikel tetraaminothphalocyanine film coated glassy carbon (GC) electrode was developed and the proposed method was successfully applied in the detection of nitrite in real samples.
132 citations
01 Jan 1981
TL;DR: The biological oxidations of ammonia to nitrite and nitrite to nitrate, collectively referred to as nitrification, are carried out in nature by two physiological groups of Gram-negative, chemolithotrophic bacteria.
Abstract: The biological oxidations of ammonia to nitrite and nitrite to nitrate, collectively referred to as nitrification, are carried out in nature by two physiological groups of Gram-negative, chemolithotrophic bacteria. The organisms in both groups fix carbon dioxide via the Calvin cycle (Campbell, Hellebust, and Watson, 1966) for their major source of cell carbon and derive their energy and reducing power either from the oxidation of ammonia (ammonia-oxidizing bacteria) or nitrite (nitrite-oxidizing bacteria). With the exception of a few strains of Nitrobacter winogradskyi, which can be grown chemoheterotro-phically, the nitrifying bacteria are obligate chemo-lithotrophs.
131 citations