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: A new method, i.e., by using waste activated sludge alkaline fermentation liquid as BNR carbon source, for simultaneously improving SCND and DPRN was reported, and sludge fermentation liquid exhibiting greater short-cut denitrifying phosphorus removal was exhibited.
Abstract: Wastewater biological nutrient removal (BNR) by short-cut nitrification-denitrification (SCND) and denitrifying phosphorus removal via nitrite (DPRN) has several advantages, such as organic carbon source saving. In this paper, a new method, i.e., by using waste activated sludge alkaline fermentation liquid as BNR carbon source, for simultaneously improving SCND and DPRN was reported. First, the performance of SCND and DPRN with sludge fermentation liquid as carbon source was compared with acetic acid, which was commonly used in literatures. Sludge fermentation liquid showed much higher nitrite accumulation during aerobic nitrification than acetic acid (81.8% versus 40.9%), and the former had significant anoxic denitrification and phosphorus uptake. The soluble phosphorus and total nitrogen removal efficiencies with sludge fermentation liquid were much higher than with acetic acid (97.6% against 73.4% and 98.7% versus 79.2%). Then the mechanisms for sludge fermentation liquid showed higher SCND and DPRN than acetic acid were investigated from the aspects of wastewater composition, microorganisms assayed by 16S rRNA gene clone library, and fluorescence in situ hybridization. More NO(2)(-)-N accumulated by the use of sludge fermentation liquid was attributed to be more humic acids in the influent, which inhibited nitrite oxidizing bacteria (NOB) more serious than ammonia oxidizing bacteria (AOB), and more AOB but less NOB were observed in the BNR system. The reasons for sludge fermentation liquid BNR system exhibiting greater short-cut denitrifying phosphorus removal were that there were less glycogen accumulating organisms and more phosphorus accumulating organisms and anoxic denitrifying phosphorus removal bacteria with higher nitrite reductase activity.
124 citations
TL;DR: Isolate yy7 can survive and remove up to 40 mg l(-1)NO(-)₂-N and can be applied as an effective aerobic denitrifier during simultaneous nitrification and denitrification via nitrite processes.
124 citations
TL;DR: N(2)O production during nitrogen removal via nitrite decreased about 50% by applying the step-feed SBR, due to the effective control of nitrite and ammonia, the precursors of N(2]O production.
Abstract: Nitrite has been commonly recognized as an important factor causing N2O production, which weakened the advantages of nitrogen removal via nitrite. To reduce and control N2O production from wastewater treatment plants, both long-term and batch tests were carried out to investigate main sources and pathways of N2O production during nitrogen removal via nitrite from real domestic wastewater. The obtained results showed that N2O production during nitrogen removal via nitrite was 1.5 times as much as that during nitrogen removal via nitrate. It was further demonstrated that ammonia oxidization were main source of N2O production during nitrogen removal from domestic wastewater; whereas, almost no N2O was produced during nitrite oxidization and anoxic denitrification. N2O production during nitrogen removal via nitrite decreased about 50% by applying the step-feed SBR, due to the effective control of nitrite and ammonia, the precursors of N2O production. Therefore, the step-feed system is recommended as an effect...
124 citations
01 Jan 1976
TL;DR: In this article, the results from experiments using an indicator ofoxidation potential, along with thereversed order ofeffectiveness of thenitrogen oxides inrelation to their degree of reduction, suggests that theinhibitory effect observed was notduetoa redox change.
Abstract: andMethanobacterium formicicum ceased ordecreased after theintroduction ofnitrate, nitrite, nitric oxide, ornitrous oxide. Sulfite hadasimilar effect onmethanogenesis inthewhole-cell suspensions. Insaltmarshsediments, nitrous oxide was thestrongest inhibitor, followed bynitric oxide, nitrite, andnitrate indecreasingorder ofinhibition. Inwhole-cell suspensions, nitric oxide was thestrongest inhibitor, followed bynitrous oxide, nitrite, andnitrate. Consideration ofthe results fromexperiments using an indicator ofoxidation potential, along with thereversed order ofeffectiveness ofthenitrogen oxides inrelation totheir degree ofreduction, suggests thattheinhibitory effect observed was notduetoa redox change. Evidence isalsopresented thatsuggests thatthedecrease inthe rateofmethaneproduction inthepresenceofoxides ofnitrogen was not attributable tocompetition formethane-producing substrates. Inanaerobic, aquatic environments richin organic compounds (ortheir products, carbon dioxide andhydrogen) methane production occursatasignificant rate; methanogenic bacteriarepresent theterminal organisms offood chains andareanimportant partofthecarbon cycle. Numerousmeasurements ofstanding cropandrates ofproduction ofmethane inmarineenvironments havebeenobtained (7, 10), butrelatively little isknownabout themicrobial ecology ofmethanogenesis (i.e., factors influencing microbial methanogenesis) in aquatic andterrestrial environments, especially anaerobic marineenvironments. Recently, theinteraction between sulfate-reducingandmethane-producing bacteria inboth freshwater (4)andmarine(9)environments hasbeeninvestigated, ashastheeffect oftemperature onmethanogenesis infreshwater sed
124 citations
TL;DR: The bacterium isolated from sea sludge Paracoccus versutus LYM was characterized with the ability of aerobic denitrification and confirmed in terms of the ability to be heterotrophic nitrification and aerobically converting over 95% NO3(-)-N to gaseous products via nitrite.
124 citations