In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

Wang, Xiaolong; Gao, Dawen

doi:10.1038/srep37500

Cited by 31 publications

(13 citation statements)

References 60 publications

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“…These results illustrate that NOB might have been adapted to the high FA and proliferated again even at the high ammonia environment [ 22 ]. Our results are somewhat in contrast to those of Wang and Gao [ 23 ], who recovered the CANON system in 56 days from the excessive multiplication of NOB using simultaneous high ammonium and nitrite concentration in the inflow. The different results observed in this study with other studies are possible due to the fact that it was difficult to keep the high nitrite in the studied CANON system, as nitrite produced by AOB could be simultaneously or promptly be assumed by anammox bacteria in the CANON operational mode.…”

Section: Resultscontrasting

confidence: 99%

Keeping a Completely Autotrophic Nitrogen Removal over Nitrite System Effective in Treating Low Ammonium Wastewater by Adopting an Alternative Low and High Ammonium Influent Regime

Chang

Wang

Chen

et al. 2018

BioMed Research International

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An alternative low and high ammonium influent regime was proposed and adopted to keep a completely autotrophic nitrogen removal over nitrite (CANON) effective when treating low ammonium wastewater. Results show that, by cyclic operating at an alternative low and high ammonium concentration for 10 days and 28 days, the CANON system could effectively treat low ammonium wastewater. Excessive proliferation of nitrite oxidizing bacteria (NOB) under low ammonium environment was still the challenge for the stable CANON operation; but with 28 days of a high ammonium treatment combined with a sludge retention time control, the NOB overproliferated in the low ammonium operational period could be under control. Specifically, when the nitrite oxidation rate reached 8 g N/m3/h, the CANON system should enter the high ammonium influent operating mode. 16S rDNA high-throughput sequencing results show that the appropriate sludge discharging provided an environment favoring Candidatus Jettenia.

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Section: Resultscontrasting

confidence: 99%

Keeping a Completely Autotrophic Nitrogen Removal over Nitrite System Effective in Treating Low Ammonium Wastewater by Adopting an Alternative Low and High Ammonium Influent Regime

Chang

Wang

Chen

et al. 2018

BioMed Research International

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“…As expected, the NRR increased to 0.82 kg•m -3 •d -1 and NRE was at around 72%. Simultaneously, the stoichiometric ratios of ΔTN/ ΔNH 4 + -N, ΔNO 3 --N/ΔNH 4 + -N, and ΔNO 3 --N/ΔTN gradually increased from 1.29, 0.10, and 0.10, respectively, on day 1, to their theoretical value (0.86, 0.11, and 0.127, respectively), as described in the relevant studies [8,38]. This meant there was significant synergy between AOB and anammox bacteria and there was no excess proliferation of NOB in the CANON reactor.…”

Section: Resultssupporting

confidence: 57%

Response and Adaptation of Microbial Community in a CANON Reactor Exposed to an Extreme Alkaline Shock

Yang

Mao

Wang

et al. 2020

Archaea

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Responses of a microbial community in the completely autotrophic nitrogen removal over nitrite (CANON) process, which was shocked by a pH of 11.0 for 12 h, were investigated. During the recovery phase, the performance, anaerobic ammonia oxidation (anammox) activity, microbial community, and correlation of bacteria as well as the influencing factors were evaluated synchronously. The performance of the CANON process deteriorated rapidly with a nitrogen removal rate (NRR) of 0.13 kg·m-3·d-1, and Firmicutes, spore-forming bacteria, were the dominant phyla after alkaline shock. However, it could self-restore within 107 days after undergoing four stages, at which Planctomycetes became dominant with a relative abundance of 64.62%. Network analysis showed that anammox bacteria (Candidatus Jettenia, Kuenenia, and Brocadia) were positively related to some functional bacteria such as Nitrosomonas, SM1A02, and Calorithrix. Canonical correspondence analysis presented a strong correlation between the microbial community and influencing factors during the recovery phase. With the increase of nitrogen loading rate, the decrease of free nitrous acid and the synergistic effects, heme c content, specific anammox activity (SAA), NRR, and the abundance of dominant genus increased correspondingly. The increase of heme c content regulates the quorum sensing system, promotes the secretion of extracellular polymeric substances, and further improves SAA, NRR, and the relative abundance of the dominant genus. This study highlights some implications for the recovery of the CANON reactor after being exposed to an alkaline shock.

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“…The NO3 − -N concentration of the effluent decreases with an increase in the NH4 + -N concentration of the influent, and because when there is little dissolved oxygen, AOB preferentially obtains O2 over NOB. In addition, an elevated concentration of substrate will inhibit NOB activity [21]. The data in Figures 2 and 3 illustrate that the nitrite accumulation efficiency rises with an increase in the NH4 + -N concentration in the influent.…”

Section: Analysis Of Partial Nitrification Processmentioning

confidence: 96%

The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity

Chen

Song

Yuan³

2021

Water

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In many experiments, a partial nitrification device is initiated with the use of highly active nitrating sludge because of the large number of nitrifying bacteria. Ammonia-oxidizing bacteria (AOB) are more adaptable to low-dissolved oxygen environments than nitrite-oxidizing bacteria (NOB). NOB activity was inhibited when the dissolved oxygen (DO) levels were decreased, causing the nitrate-nitrogen concentration to gradually decrease in the effluent and the nitrite-nitrogen concentration to gradually increase, achieving the accumulation of nitrous nitrogen. In this experiment, a sequencing batch reactor (SBR) was used to suppress NOB activity at a given pH while maintaining DO at a very low level so that the ammonia–water reaction mainly occurred in the device, and then the mud and water separated. Compared with other experiments, this approach can occur in 25 days, and it runs stably for more than two months until the device closes when the ammonia-nitrogen concentration is about 170 mg/L. This experiment also compared the difference between the pH change at the beginning of the device operation and after the device was stable. In order to increase the efficiency of bacterial appreciation, supplementing NaHCO3 increased the HCO3− concentration by 300 mg/L on the 25th day. It was found that some nitrification reactions still occurred, but they were not enough to destabilize the device. The nitrosate accumulation efficiency still gradually increased, and the average nitrite accumulation efficiency was 87.25% after NaHCO3 supplementation.

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In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

Cited by 31 publications

References 60 publications

Keeping a Completely Autotrophic Nitrogen Removal over Nitrite System Effective in Treating Low Ammonium Wastewater by Adopting an Alternative Low and High Ammonium Influent Regime

Keeping a Completely Autotrophic Nitrogen Removal over Nitrite System Effective in Treating Low Ammonium Wastewater by Adopting an Alternative Low and High Ammonium Influent Regime

Response and Adaptation of Microbial Community in a CANON Reactor Exposed to an Extreme Alkaline Shock

The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity

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