Nitrifier characteristics in submerged membrane bioreactors under different sludge retention times

Yu, Tao; Qi, Rong; Li, Dong; Zhang, Yu; Yang, Min

doi:10.1016/j.watres.2010.02.021

Cited by 39 publications

(16 citation statements)

References 39 publications

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“…It has been reported that longer SRT could impact the biological activities negatively including nitrification rate of MBR (Yu et al 2010). A study conducted by Yu et al (2010), observed a negative correlation between SRT and the nitrifier activities, i.e.…”

Section: Sludge Retention Timementioning

confidence: 96%

“…In two different MBRs investigated (one was adapted with biofilm support medium), Liang et al (2010) noted that high nitrification rates correlated with the high species richness of nitrifying bacteria. Various authors have reported 96-99 and 92-98 % ammonia-nitrogen and COD removals, respectively, in MBRs investigated Yu et al 2010;Ozdemir et al 2011). Although a higher nitrogen removal is being reported in MBR by various authors in comparison with conventional activated sludge systems, MBRs seem not to have an edge in terms of specific nitrification rates.…”

Section: Nitrification Processmentioning

confidence: 98%

“…Although a higher nitrogen removal is being reported in MBR by various authors in comparison with conventional activated sludge systems, MBRs seem not to have an edge in terms of specific nitrification rates. Specific ammonia oxidization rate and nitrite oxidization rates were also reported to vary with no particular pattern in MBRs Yu et al 2010;Ozdemir et al 2011). Nevertheless, the major advantage of MBR over CAS is the ability to retain a more diverse nitrifying community including slow-growing species, which makes it relatively more resilient in the face of operational and environmental fluctuations (Zhang et al 2009a;Yu et al 2011).…”

Section: Nitrification Processmentioning

confidence: 99%

“…A study conducted by Yu et al (2010), observed a negative correlation between SRT and the nitrifier activities, i.e. for both SAOR and specific nitrate formation rate (SNFR).…”

Section: Sludge Retention Timementioning

confidence: 99%

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Ecophysiology of nitrifying communities in membrane bioreactors

Awolusi

Kumari

Bux

2014

Int. J. Environ. Sci. Technol.

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Membrane bioreactors (MBRs) are rapidly becoming the technology of choice over conventional activated sludge treatment systems due to their smaller footprint, reduced sludge production, rapid start-up of biological processes, complete removal of suspended solids and better effluent quality. The retention of sufficient amount of slow-growing nitrifiers makes it feasible for the MBRs to achieve strong tolerance against the shock loads with stable and highly efficient nitrogen removal. Various studies have focused on the ecophysiology of nitrifiers in MBRs as well as their distinctive operational parameters as well as their impact on the selection and activity of nitrifying community. Several techniques have been employed over the years to understand the nitrifying community and their interaction within the MBR system, which led to its modification from the initial design. This review focuses on the identification of optimal operational and environmental conditions for efficient nitrification in MBRs. The advantages and limitations of different techniques employed for investigating the nitrifying communities in MBRs are also emphasized.

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Section: Sludge Retention Timementioning

confidence: 96%

Section: Nitrification Processmentioning

confidence: 98%

Section: Nitrification Processmentioning

confidence: 99%

“…A study conducted by Yu et al (2010), observed a negative correlation between SRT and the nitrifier activities, i.e. for both SAOR and specific nitrate formation rate (SNFR).…”

Section: Sludge Retention Timementioning

confidence: 99%

See 2 more Smart Citations

Ecophysiology of nitrifying communities in membrane bioreactors

Awolusi

Kumari

Bux

2014

Int. J. Environ. Sci. Technol.

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“…FISH법은 다양한 종류의 probe들을 사용하여 전체적인 박 테리아 군집에 대한 해석이 용이하며, 또한, 목적으로 하는 특정 박테리아 군집들에 대해 정성·정량적인 평가가 가능하 기 때문에 환경시료 내의 박테리아 군집 구조 분석과 모니터 링에 다양하게 적용되고 있다 [18][19][20]. 특히, 수처리 분야에서 하·폐수처리 공정내의 생물학적 처리공정의 박테리아 군집 분석 [15,16,[19][20] DAPI법에 의한 총 세균수 측정은 고정된 시료 2 µL를 gelatin으로 코팅된 slide glass에 놓고, DAPI (4',6-diamidino 2-phenylindole 1 µg/mL, Sigma, USA)로 5분 동안 염색하였 다.…”

Section: 서론unclassified

Analysis of Microbial Community Structure for Effective Removal of Mixed Wastewater in Biological Wastewater Treatment

손형식¹,

손희종²,

이상준³

2013

KSBB Journal

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Depending on season, mixed wastewater can show great deviations in terms of the influent ratios of tannery and seafood-wastewater. Increases in the ratio of tannery wastewater in influent water also result in increases in the concentration of chromium, which decreases the ratio of BOD/T-N so that the removal efficiency of organic and nitrogen pollutants in biological wastewater treatment deteriorates. No substantial differences occur in the ratios of Eubacteria/total bacteria as the ratio between tannery wastewater and seafood wastewater changes in the influent water. In contrast, the cell numbers and activities of Eubacteria and total bacteria significantly decline with increasing ratios of tannery wastewater in the influent water. Stable removal of organic and nitrogen pollutants by biological wastewater treatments leads to dominance of Proteobacteria groups in all biological treatment basins. In aeration and oxic basins, γ-Proteobacteria account for approximately 21% of the Eubacteria groups, at 1.9×10 92.0×109 cells/mL, while in an anoxic basin, β-Proteobacteria account for approximately 19% of the Eubacteria groups, at 1.3×10 9 cells/mL. However, a substantial decline in dominance of approximately 11% occurs for γ-Proteobacteria in aeration and oxic basins and about 1% for β-Proteobacteria in an anoxic basin. Mixed wastewater that undergoes extensive property changes of the influent water shows an efficiency of biological treatment that is greatly influenced by the ratio of dominant Proteobacteria groups.

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Structure and dynamics of nitrifier populations in a full-scale submerged membrane bioreactor during start-up

et al. 2010

Appl Microbiol Biotechnol

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Changes of microbial characteristics in a full-scale submerged membrane bioreactor system (capacity, 60,000 m(3) day(-1)) treating sewage were monitored over the start-up period (96 days). Fluorescence in situ hybridization analysis showed that the percentages of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (nitrobacter-related population) in total bacteria counted with DAPI staining increased significantly from 1.9% and 0.9% to 4.5% and 2.8%, corresponding to an increase of the specific ammonium oxidizing rate (from 0.06 to 0.12 kg N kg(-1) mixed liquor suspended solids (MLSS) per day) and the specific nitrate forming rate (from 0.05 to 0.10 kg N kg(-1) MLSS day(-1)). Both the denaturing gradient gel electrophoresis of polymerase chain reaction and clone library results showed that the AOB was dominated by the genus Nitrosomonas, the diversity of which increased markedly with operational time. Most of the day 2 clones were closely related with the uncultured Nitrosomonas sp. clone Ninesprings-49S amoA gene (AY356450.1) originated from activated sludge, while the day 96 clone library showed a more diverse distribution characterized by the appearance of the oligotrophic nitrifiers like the Nitrosomonas oligotropha- and Nitrosomonas ureae-like bacteria, perhaps due to the interception by membrane and the low food-to-microorganisms ratio environment. The above results show that the membrane bioreactor system was characterized by the increased diversity and percentage of nitrifiers, which made it possible to achieve a stable and high efficient nitrification. Ammonia-oxidizing archaea with the changing population structures were also detected, but their roles for ammonia oxidation in the system need further studies.

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Nitrifier characteristics in submerged membrane bioreactors under different sludge retention times

Cited by 39 publications

References 39 publications

Ecophysiology of nitrifying communities in membrane bioreactors

Ecophysiology of nitrifying communities in membrane bioreactors

Analysis of Microbial Community Structure for Effective Removal of Mixed Wastewater in Biological Wastewater Treatment

Structure and dynamics of nitrifier populations in a full-scale submerged membrane bioreactor during start-up

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