Partial nitrification—operational parameters and microorganisms involved

Sinha, Banashri; Annachhatre, Ajit P.

doi:10.1007/s11157-006-9116-x

Cited by 160 publications

(68 citation statements)

References 159 publications

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“…Although the exact triggers for N 2 O production by nitrifying and denitrifying sludge are yet to be fully revealed, and the predominant pathway relating to N 2 O production by AOB remains to be elucidated, it is generally observed that sudden process perturbations such as rapid shifts in reactor pH, DO and NH 4 þ or NO 2 2 spikes lead to immediate increases in N 2 O emissions [68,90,98]. In fact, N 2 O emission has been recommended to be used as an indication of biological nitrification failure owing to toxic shock loads or insufficient aeration [13].…”

Section: Possible Mitigation Strategiesmentioning

confidence: 99%

Nitrous oxide emissions from wastewater treatment processes

Law

Pan

et al. 2012

Phil. Trans. R. Soc. B

386

283

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Nitrous oxide (N 2 O) emissions from wastewater treatment plants vary substantially between plants, ranging from negligible to substantial (a few per cent of the total nitrogen load), probably because of different designs and operational conditions. In general, plants that achieve high levels of nitrogen removal emit less N 2 O, indicating that no compromise is required between high water quality and lower N 2 O emissions. N 2 O emissions primarily occur in aerated zones/compartments/periods owing to active stripping, and ammonia-oxidizing bacteria, rather than heterotrophic denitrifiers, are the main contributors. However, the detailed mechanisms remain to be fully elucidated, despite strong evidence suggesting that both nitrifier denitrification and the chemical breakdown of intermediates of hydroxylamine oxidation are probably involved. With increased understanding of the fundamental reactions responsible for N 2 O production in wastewater treatment systems and the conditions that stimulate their occurrence, reduction of N 2 O emissions from wastewater treatment systems through improved plant design and operation will be achieved in the near future.

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Section: Possible Mitigation Strategiesmentioning

confidence: 99%

Nitrous oxide emissions from wastewater treatment processes

Law

Pan

et al. 2012

Phil. Trans. R. Soc. B

386

283

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“…Some studies state that the growth rate of AOB is higher than that of NOB when DO concentrations drop below 1 mg L −1 [22]. Therefore, DO concentrations lower than 1 mg L −1 are used to control NOB in partial nitritation reactors [59,60] ) in order to control nitrate accumulation [22]. In addition, low DO concentrations are related to increasing NO and N 2 O emissions [11].…”

Section: Effect Of Ph and Domentioning

confidence: 99%

The Effect of Influent Characteristics and Operational Conditions over the Performance and Microbial Community Structure of Partial Nitritation Reactors

Rodríguez-Sánchez

González‐Martínez

Martı́nez-Toledo

et al. 2014

Water

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Nitrogen is a main contaminant of wastewater worldwide. Novel processes for nitrogen removal have been developed over the last several decades. One of these is the partial nitritation process. This process includes the oxidation of ammonium to nitrite without the generation of nitrate. The partial nitritation process has several advantages over traditional nitrification-denitrification processes for nitrogen removal from wastewaters. In addition, partial nitritation is required for anammox elimination of nitrogen from wastewater. Partial nitritation is affected by operational conditions and substances present in the influent, such as quinolone antibiotics. In this review, the impact that several operational conditions, such as temperature, pH, dissolved oxygen concentration, hydraulic retention time and solids retention time, have over the partial nitritation process is covered. The effect of quinolone antibiotics and other emerging contaminants are discussed. Finally, future perspectives for the partial nitritation process are commented upon.

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“…The high biomass concentration in SBBGR can be responsible for the disappearance of nitrite oxidizing bacteria (NOB). In fact, due to the high biomass concentration and to the oxygen diffusion gradient, micro-aerated, anoxic and even anaerobic zones exist in the reactor; such a condition can have inhibited NOB and caused their disappearance, because they are less robust than ammonia oxidizing bacteria (AOB) towards low DO, due to the difference in the saturation constant for oxygen (Sinha and Annachhatre 2007).…”

Section: Biomass Characterizationmentioning

confidence: 99%

On-site treatment of textile yarn dyeing effluents using an integrated biological–chemical oxidation process

Lotito

Sanctis

Rossetti

et al. 2013

Int. J. Environ. Sci. Technol.

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This paper reports the results of the treatment of a yarn dyeing effluent using an integrated biologicalchemical oxidation process. In particular, the biological unit was based on a sequencing batch biofilter granular sludge reactor (SBBGR), while the chemical treatment consisted of an ozonation step. Biological treatment alone was first performed as a reference for comparison. While biological treatment did not produce an effluent for direct discharge, the integrated process assured good treatment results, with satisfactory removal of chemical oxygen demand (up to 89.8 %), total nitrogen (up to 88.2 %), surfactants (up to 90.7 %) and colour (up to 99 %), with an ozone dose of 110 mg of ozone per litre of wastewater. Biomass characterization by fluorescence in situ hybridization has revealed that filamentous bacteria represented about 20 % of biomass (coherently with high sludge volume index values); thanks to its special design, SBBGR guaranteed, however, stable treatment performances and low effluent suspended solids concentrations, while conventional activated sludge systems suffer from sludge bulking and even treatment failure in such a condition. Furthermore, biomass characterization has evidenced the presence of a shortcut nitrification-denitrification process.

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Partial nitrification—operational parameters and microorganisms involved

Cited by 160 publications

References 159 publications

Nitrous oxide emissions from wastewater treatment processes

Nitrous oxide emissions from wastewater treatment processes

The Effect of Influent Characteristics and Operational Conditions over the Performance and Microbial Community Structure of Partial Nitritation Reactors

On-site treatment of textile yarn dyeing effluents using an integrated biological–chemical oxidation process

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