Effect of C/N values on microbial simultaneous removal of carbonaceous and nitrogenous substances in wastewater by single continuous-flow fluidized-bed bioreactor containing porous carrier particles

Xing, Xin‐Hui; Jun, Byong-Hee; Yanagida, Mari; Tanji, Yasunori; Unno, Hajime

doi:10.1016/s1369-703x(99)00056-x

Cited by 35 publications

(13 citation statements)

References 5 publications

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“…The available literature shows that changing the C/N ratio of wastewater can affect nitrogen removal in the bioreactors, such as bench-scale biological aerated filter (BAF; Ohashi et al 1995), fluidized-bed bioreactor (Xing et al 2000) and SND-based sequencing batch reactor (SBR; Chiu et al 2007). However, little investigation has been carried out to characterize the microbial community in aerobic MBBR applied for SND.…”

Section: Introductionmentioning

confidence: 99%

Characterization of microbial community in an aerobic moving bed biofilm reactor applied for simultaneous nitrification and denitrification

Liao

Ding

et al. 2010

World J Microbiol Biotechnol

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A continuous-flow moving bed biofilm reactor (MBBR) under aerobic conditions was established for simultaneous nitrification and denitrification (SND), and microbial communities were investigated by a combination of denaturing gel gradient electrophoresis (DGGE) and fluorescence in situ hybridization (FISH). DGGE analysis has revealed more similar microbial community structures formed in the biofilms with more similar carbon nitrogen (C/N) ratios. FISH analysis shows that the dominance of both Betaproteobacteria ammonia-oxidizing bacteria and Nitrospira-like nitrite-oxidizing bacteria were negatively correlated to C/N ratios. Sequence analysis of DGGE bands has indicated the presence of anoxic denitrifying bacteria Agrobacterium tumefaciens and Rhizobium sp., suggesting that the oxygen gradient inside the biofilm may be responsible for the mechanism of SND in aerobic MBBRs. The study confirms that appropriate control of microbial community structure resulting from optimal C/N ratio is beneficial in improving SND, thus optimizing nitrogen removal in aerobic MBBR. The established SND-based MBBR can save operation space and time in comparison to the traditional nitrogen removal process, and might be very attractive for future practical applications.

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Section: Introductionmentioning

confidence: 99%

Characterization of microbial community in an aerobic moving bed biofilm reactor applied for simultaneous nitrification and denitrification

Liao

Ding

et al. 2010

World J Microbiol Biotechnol

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“…A fluidized bed bioreactor system removed 91% of TOC and 85% of total N when the influent had moderate C/N ratios (Xing et al, 2000). 2000).…”

Section: Nutrient Removalmentioning

confidence: 99%

Biological Fixed Film Systems

Fitch¹,

Lam²,

Segar³

2000

Water Environment Research

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“…Xu [12] used the bio-external recycling biological fluidized bed with granular activated carbon (GAC) as carrier for dying wastewater treatment. Xing, et al [13] presented a single continuous-flow fluidized-bed bioreactor system consisting of porous carrier particles for retaining microbes. The system was constructed to simultaneously remove carbonaceous and nitrogenous substances in wastewater under different C/N (mass ratio) values.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and oxygen transfer in a novel extra-loop fluidized bed bioreactor

Lu¹,

Dagot²,

Baudu³

et al. 2010

J. Shanghai Univ.(Engl. Ed.)

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International audienceIn this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5-3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor (CSTR) mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. K La could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, K La value was increased. The amount of carrier complex influence on K La. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800-1 000 g carrier loading (pouzzolane) or 600 g PVC. Under gas/liquid ratio of 0.8%-5.2%, K La was (0.62-1.37)×10−2 s−1

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Effect of C/N values on microbial simultaneous removal of carbonaceous and nitrogenous substances in wastewater by single continuous-flow fluidized-bed bioreactor containing porous carrier particles

Cited by 35 publications

References 5 publications

Characterization of microbial community in an aerobic moving bed biofilm reactor applied for simultaneous nitrification and denitrification

Characterization of microbial community in an aerobic moving bed biofilm reactor applied for simultaneous nitrification and denitrification

Biological Fixed Film Systems

Hydrodynamics and oxygen transfer in a novel extra-loop fluidized bed bioreactor

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