Nitrogen Removal via Nitrite from Municipal Wastewater at Low Temperatures using Real-Time Control to Optimize Nitrifying Communities

Yang, Qian; Peng, Yongzhen; Liu, Xiuhong; Zeng, Wei; Mino, Takashi; Satoh, Hiroyasu

doi:10.1021/es070850f

Cited by 309 publications

(138 citation statements)

References 18 publications

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“…Moreover, most described AOB have an optimal temperature of around 28°C (36). On the other hand, some studies indicated that nitrite-oxidizing bacteria were capable of growing at lower temperatures ranging from Ϫ2°C (37) to 17°C (36) and that at 10°C to 15°C, NOB had a higher activity than AOB (15). If NOB had a competitive advantage over AOB or anammox bacteria below 20 to 25°C, depending on their affinity for nitrite and O 2 , they could take up the limiting O 2 and nitrite before AOB and anammox bacteria, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…This may lead to lower specific activities and growth rates for both anammox bacteria and AOB. Indeed, it was reported that the activities of anammox bacteria and AOB both decreased at 15 to 20°C (13,14) and that partial nitrification was difficult to achieve in winter because of the varying temperature of municipal wastewater (15). Nevertheless, several studies showed that nitrogen removal at a lower temperature by an anammox process can work (14,16,17); still, in none of these studies was it possible to maintain a stable anammox-AOB culture (nitritation-anammox) at temperatures lower than 20°C.…”

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confidence: 99%

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Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Lotti

Kreuk³

et al. 2013

Appl Environ Microbiol

264

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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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Lotti

Kreuk³

et al. 2013

Appl Environ Microbiol

264

131

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“…Although ammonia has been confirmed to be removed through SND, the organisms responsible for nitrification are still unknown. In the process of shortcut nitrogen removal, NOB could be gradually washed out from system due to the unfavorable environment like low DO [22]. From Fig.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Nitrification and Denitrification Associated Phosphorus Uptake Properties of Sludge Subjected to EBPR with Efficient Micro Aeration

Ma¹,

Yu²,

Lu³

et al. 2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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Simultaneous nitrification and denitrification (SND) under low dissolved oxygen (DO) and anaerobic/aerobic(anoxic) enhanced phosphorus removal (EBPR) are two processes that can significantly reduce the energy and carbon required for nutrient removal. The combination of the two processes is expected to achieve biological nutrient removal with minimal requirement of oxygen and carbon. In this study, a lab-scale sequencing batch reactor (SBR) was operated to perform simultaneous nitrification and denitrification as well as phosphorus removal (SNDPR) with micro aeration. The EBPR system showed a high phosphorus removal efficiency (phosphate in effluent <0.5 mg/L) and complete ammonia oxidation without accumulation of nitrite and nitrate under low dissolved oxygen (DO) concentration (controlled at 0.2 mg/L). Regular operation and batch test demonstrated that the sludge was capable of using nitrite as electron acceptor to take up phosphate, the maximum specific denitrifying phosphorus uptake rates of adding 10 mg/L and 50 mg/L NO 2 --N to maximum specific aerobic phosphorus uptake rate were 44.9% and 87.2%, respectively. Moreover, batch tests suggested that ammonia nitrogen was removed through simultaneous nitrification and denitrification rather than anaerobic ammonium oxidation, whereas ammonia oxidized bacteria (AOB) and nitrite oxidized bacteria (NOB) were found to be less active than PAOs under low DO environment.

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“…Researchers argue that pH profile is the best indicator of the changes in the microbes profile occurring inside a SBR reactor [64]. However, the background alkalinity present in the wastewater often provides a strong buffering capacity that minimises noticeable variation in the pH.…”

Section: Process Control Strategiesmentioning

confidence: 99%

Sequencing Batch Reactor for Wastewater Treatment: Recent Advances

2015

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Sequencing batch reactors (SBRs), due to its operational flexibility and excellent process control possibilities, are being extensively used for the treatment of wastewater which nowadays is fast becoming contaminated with newer and more complex pollutants. It is also possible to include different expanding array of configurations and various operational modifications to meet the effluent limits which are also continuously getting upgraded. This article provides basic description of SBR process along with its functional and physical variants that lead to improved the removal of nutrients and emerging contaminants. The significance of selectors and various recent advancements in the application of SBR has been discussed along with the possibilities held by SBR process in the treatment of wastewater of different origins and composition to produce effluent of reusable quality.

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Nitrogen Removal via Nitrite from Municipal Wastewater at Low Temperatures using Real-Time Control to Optimize Nitrifying Communities

Cited by 309 publications

References 18 publications

Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Nitrogen Removal by a Nitritation-Anammox Bioreactor at Low Temperature

Simultaneous Nitrification and Denitrification Associated Phosphorus Uptake Properties of Sludge Subjected to EBPR with Efficient Micro Aeration

Sequencing Batch Reactor for Wastewater Treatment: Recent Advances

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