A novel process combining simultaneous partial nitrification, anammox and denitrification (SNAD) with denitrifying phosphorus removal (DPR) to treat sewage

Wen, Xin; Zhou, Jian; Li, Yancheng; Qing, Xiaoxia; He, Qiang

doi:10.1016/j.biortech.2016.09.132

Cited by 78 publications

(16 citation statements)

References 24 publications

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“…The microbial communities of the biofilm on the surface of SNAD bioreactor media were investigated ( Table 2). The higher Shannon value and the lower Simpson value, the higher community diversity (Wen et al, 2016). The result demonstrated that community diversity in anoxic environment (B5 and B9) was higher than that in aerobic environment (B1 and B10).…”

Section: Microbial Community Structure Of the Snad Bioreactormentioning

confidence: 85%

“…It was detected with higher relative abundance in B1, in which the COD and DO concentrations were higher. The dominant phylum, Proteobacteria, was partially identified as nitrogen-fixation bacteria (Wen et al, 2016) and affiliated with AOB (Nitrosomonadaceae), NOB (Nitrospira and Devosia), and denitrifiers. Chloroflexi was speculated as scavengers of organic matter derived from anammox bacteria.…”

Section: Functional Bacteria Of the Snad Bioreactormentioning

confidence: 99%

“…Meanwhile, anaerobic ammonium oxidation (anammox) have been widely applied to nitrogen removal (Zheng et al, 2019), which was an energy-saving process without extra organic electron donor that oxidized ammonium and nitrite to N 2 (Wang et al, 2019b). The simultaneous partial nitrification, anammox and denitrification (SNAD) process has been developed to treat the wastewater with high concentration of nitrogen and low concentration of COD simultaneously (Keluskar et al, 2013;Wang et al, 2016;Wen et al, 2016). SNAD has been proven to be an efficient, economical and environmentally friendly process.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Lü

Zhang

et al. 2020

Bioresource Technology

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The efficient removal of nitrogen pollutants in the aquaculture systems is still a challenge due to the low concentration of organic carbon and high concentration of dissolved oxygen (DO) in the wastewater. The simultaneous partial nitrification, anammox and denitrification (SNAD) bioreactor was firstly used for the treatment of aquaculture wastewater in recirculating aquaculture system. The bioreactor operated for 180 days without adding extra organic carbon. After 60-day operation, the bioreactor reached the stable stage with the average concentration of ammonia/nitrate/nitrite/COD in the effluent with 0.26/0.75/0.47/0.27 mg/L. The Pseudoxanthomonas was the dominant genus in the biofilm samples. The typical nitrogen functional bacteria and genes for nitrification, anammox and denitrification were detected with different abundance in different procedures along the bioreactor. Network analysis revealed the significant correlations between nitrogen functional bacteria and genes. The SNAD bioreactor achieved the effective removal for nitrogen and COD under high DO conditions in recirculating aquaculture system.

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Section: Microbial Community Structure Of the Snad Bioreactormentioning

confidence: 85%

Section: Functional Bacteria Of the Snad Bioreactormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Lü

Zhang

et al. 2020

Bioresource Technology

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“…The relative abundance of the phylum Chloroflexi increased from 4.6 to 41.7% overtime. Studies have reported that Chlorobi is an autotrophic bacterium and can thus be enriched through adaptation to the inorganic environment within the anammox reactor [50]. The relative abundance of the phylum Chlorobi increased from 1.4 to 13.3%.…”

Section: Resultsmentioning

confidence: 99%

Abundance and diversity of nitrogen-removing microorganisms in the UASB-anammox reactor

et al. 2019

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Anaerobic ammonium oxidation is considered to be the most economical and low-energy biological nitrogen removal process. So far, anammox bacteria have not yet been purified from cultures. Some nitrogen-removing microorganisms cooperate to perform the anammox process. The objective of this research was to analyze the abundance and diversity of nitrogen-removing microorganisms in an anammox reactor started up with bulking sludge at room temperature. In this study, the ammonia-oxidizing archaea phylum Crenarchaeota was enriched from 9.2 to 53.0%. Nitrosomonas , Nitrosococcus , and Nitrosospira , which are ammonia-oxidizing bacteria, increased from 3.2, 1.7, and 0.1% to 12.8, 20.4, and 3.3%, respectively. Ca . Brocadia , Ca . Kuenenia , and Ca . Scalindua , which are anammox bacteria, were detected in the seeding sludge, accounting for 77.1, 11.5, and 10.6%. After cultivation, the dominant genus changed to Ca . Kuenenia , accounting for 82.0%. Nitrospirae , nitrite oxidation bacteria, decreased from 2.2 to 0.1%, while denitrifying genera decreased from 12.9 to 2.1%. The results of this study contribute to the understanding of nitrogen-removing microorganisms in an anammox reactor, thereby facilitating the improvement of such reactors. However, the physiological and metabolic functions of the ammonia-oxidizing archaea community in the anammox reactor need to be investigated in further studies.

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“…Thauera was a facultative anaerobic denitrifying bacteria that could compete with the electron acceptor of the PAOs [45][46][47][48], and its abundance was always lower than 0.5%. Propionivibrio (2.79% and 9.75%) was one genus of the GAOs in the daily wastewater treatment plants that impeded the EBPRs efficiency in high abundance and competed for nutrition with the PAOs [49].…”

Section: Sludge Structure and Microbial Community Compositionmentioning

confidence: 99%

Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor

Liu

Yao

Cong

et al. 2019

Water

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Biological phosphorus removal using an anaerobic-aerobic sequencing batch reactor (SBR) in a low temperature can be difficult to remove, and aeration always accounts for nearly half of the total electricity costs at many wastewater treatment plants. In this study, a pilot-scale anaerobic-critical aerobic SBR (A-CA SBR) was developed for synthetic domestic wastewater. More importantly, the phase, whose concentration of diffused oxygen was controlled at 1.0-1.5 mg/L, was defined as a critical aerobic phase, which reduced expenses during the operation. To be specific, half of the ammonia was removed within 10 days and no NO 3 − -N was accumulated during the process.From the SEM and metagenome analysis, Rhodocyclus, Zooglea, Dechloromonas, and Simplicispira had the ability to remove phosphorus and NO 3 − -N simultaneously, which proved the existence of a potential double-layer sludge structure under an A-CA operational condition. All of the results disclose that the pilot-scale A-CA SBR is a reliable manipulation strategy for phosphorus removal under low temperatures, which can hopefully apply to practical wastewater remediation.Among all of the influenced parameters, temperature is a vital factor in the phosphorus uptake process. Li et al. reported that 20 • C or possibly lower was suitable for P removal of microorganisms [2], and Liu and Li showed that temperatures below the optimum range had more significant effects on growth rate than those above the optimum range, because the activities of the microorganisms sharply decreased with the decreasing temperature. So, it was more difficult to realize phosphorus removal at a low temperature [10]. Additionally, Liu et al. [11] investigated the influence of temperature on denitrifying phosphorus removal (DPR), and found that more than 80% of phosphorus removal from DPR was obtained in the range of 20-30 • C, and the removal efficiencies went down when the temperature was below 10 • C. However, in the north of China, temperature changes drastically when the season varies. Especially in winter, wastewater is at low temperatures (11-13 • C) for a long period, which results in a negative impact on the performance of phosphorus removal [12]. Therefore, it is crucial to find a solution to treat wastewater in low temperatures properly.It has been noted that most studies have been focused on lab-scale SBR [3,7,13,14], and pilot-scale SBR are reported on less. In this study, the phase whose concentration of diffused oxygen was controlled at 1.0-1.5 mg/L was defined as a critical aerobic phase. A pilot-scale anaerobic-critical aerobic (A-CA) SBR, which had a good adaption, high efficiency, and strong practicality [15], was designed to remove phosphorus in wastewater under cold temperatures. During the operation process, a sludge structure of the inner anoxic zone and outer-critical aerobic layer was found, and metagenome analysis proved the microorganism's variation. In addition, the optimization of the length of the critical aerobic phase was investigated in order further to obta...

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A novel process combining simultaneous partial nitrification, anammox and denitrification (SNAD) with denitrifying phosphorus removal (DPR) to treat sewage

Cited by 78 publications

References 24 publications

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Abundance and diversity of nitrogen-removing microorganisms in the UASB-anammox reactor

Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor

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