Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor

Blackburne, Richard; Yuan, Zhiguo; Keller, Jürg

doi:10.1007/s10532-007-9136-4

Cited by 352 publications

(162 citation statements)

References 24 publications

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“…It has been reported that Nitrosomonas spp., typical AOB [24], have a maximum growth rate of 0.54 ± 0.09 day −1 , while Nitrobacter spp., typical NOB [24], have a maximum growth rate of 0.67 ± 0.03 day −1 [66]. Other authors have reported similar values for a minimum doubling time of AOB (7-8 h) and NOB (10-13 h) [21].…”

Section: Effect Of Hrt and Srtsupporting

confidence: 59%

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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Section: Effect Of Hrt and Srtsupporting

confidence: 59%

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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“…Even an extended enrichment at 12°C (132 days) did not facilitate the growth of NOB. Our results showed that anammox bacteria directly consumed nitrite produced by AOB, and when the system was both nitrite and O 2 limited, NOB had a lower affinity to nitrite than anammox bacteria (40,41). In our laboratory-scale bioreactor, nitrite oxidation activity could easily be suppressed under oxygen limitation and did not contribute to nitrate formation.…”

Section: Discussionmentioning

confidence: 67%

Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Lotti

Kreuk³

et al. 2013

Appl Environ Microbiol

262

131

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dCurrently, nitritation-anammox (anaerobic ammonium oxidation) bioreactors are designed to treat wastewaters with high ammonium concentrations at mesophilic temperatures (25 to 40°C). The implementation of this technology at ambient temperatures for nitrogen removal from municipal wastewater following carbon removal may lead to more-sustainable technology with energy and cost savings. However, the application of nitritation-anammox bioreactors at low temperatures (characteristic of municipal wastewaters except in tropical and subtropical regions) has not yet been explored. To this end, a laboratory-scale (5-liter) nitritation-anammox sequencing batch reactor was adapted to 12°C in 10 days and operated for more than 300 days to investigate the feasibility of nitrogen removal from synthetic pretreated municipal wastewater by the combination of aerobic ammonium-oxidizing bacteria (AOB) and anammox. The activities of both anammox and AOB were high enough to remove more than 90% of the supplied nitrogen. Multiple aspects, including the presence and activity of anammox, AOB, and aerobic nitrite oxidizers (NOB) and nitrous oxide (N 2 O) emission, were monitored to evaluate the stability of the bioreactor at 12°C. There was no nitrite accumulation throughout the operational period, indicating that anammox bacteria were active at 12°C and that AOB and anammox bacteria outcompeted NOB. Moreover, our results showed that sludge from wastewater treatment plants designed for treating high-ammonium-load wastewaters can be used as seeding sludge for wastewater treatment plants aimed at treating municipal wastewater that has a low temperature and low ammonium concentrations. N itrogen removal from wastewater treatment is necessary because of the significant adverse environmental impact of ammonia/ammonium, such as eutrophication and toxicity to aquatic life, on the receiving bodies. Generally, carbonaceous waste is removed in the first stage of wastewater treatment, which is followed by nitrogen removal systems. Conventionally, the removal of nitrogen (ammonium) is accomplished by the combination of nitrification and denitrification processes. Both of these are energy consuming and are associated with high costs. Moreover, these processes have an additional environmental impact due to high biomass production and greenhouse gas (CO 2 , N 2 O, etc.) emission, which promote global warming.Anaerobic ammonium-oxidizing (anammox) bacteria convert ammonium and nitrite directly to dinitrogen gas (N 2 ) under anoxic conditions. Since they were first detected in a denitrifying pilot plant by Mulder et al. in 1995 (1), anammox bacteria have been found in various oxygen-limited natural (2-4) and manmade ecosystems. The application of the anammox process in wastewater treatment results in significant energy reduction (60%) and greenhouse gas emission (90%) compared to those of traditional biological nitrogen removal processes (5-7). In fullscale nitritation-anammox wastewater treatment plants, ammonium-oxidizing bacteria (AOB) convert approx...

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“…Nitritation can be achieved by controlling the operating parameters, including dissolved oxygen (DO), SRT, hydraulic retention time (HRT), pH, temperature (T), substrate concentration, and so on [8][9][10][11]. Because nitrite oxidizing bacteria (NOB) have a lower affinity for DO than ammonia oxidizing bacteria (AOB), AOB will over-compete NOB under low DO conditions, resulting in NO2-N accumulation [12]. In addition, free ammonia (FA) in the range of 1-5 mg/L inhibits the activities of NOB, while having little effect on AOB [13].…”

Section: Introductionmentioning

confidence: 99%

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

Zheng

Xing

2014

Water

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Abstract:The effective management of high ammonium containing wastewater is important for the sustainable development of the wastewater industry. A pre-denitrification and post-nitrification two-sludge system was proposed to treat high ammonium containing wastewater with low carbon-to-nitrogen (C/N) ratios. In the system, pre-denitrification was adopted to use organic carbon in raw wastewater efficiently for nitrogen removal, while post-nitrification was adopted to achieve nitritation. System performance and the characteristics of nitrous oxide (N2O) emission were examined. As to the influent chemical oxygen demand (COD) and ammonium nitrogen (NH4-N) concentration, both 800 mg/L, nitrogen removal was mainly through pre-denitrification, and the nitrogen removal percentage was 43.4%. In post-nitrification, nitritation was achieved with a nitrite accumulation efficiency of 97.8% and a NH4-N removal loading rate of 0.45 g/(L·d). With nitrite as the electron acceptor during denitrification, its removal rate increased, while the N2O emission factor decreased with increasing C/N ratios. Nitrification was affected significantly by the aeration rate. When the aeration rate was below 0.6 L/min, the NH4-N removal rate increased, while the N2O emission rate decreased with increasing aeration rates. However, when the aeration rate was above 0.6 L/min, it had little influence on N2O OPEN ACCESSWater 2014, 6 2979 emission. During nitrification, N2O emission factors decreased exponentially with increasing ammonium oxidation rates.

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Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor

Cited by 352 publications

References 24 publications

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

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

Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

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