A model for a nitrifying suspended-growth reactor incorporating intraparticle diffusional limitation

Bakti, N. A. K.; Dick, Richard I.

doi:10.1016/0043-1354(92)90168-4

Cited by 43 publications

(25 citation statements)

References 20 publications

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“…The average floc size of this study was 7.754 µm, which was significantly smaller than the mean floc diameter reported by Bakti and Dick (1992) of 32 µm for nitrifying suspended growth biological reactors, the value of 80 µm reported by Beccari et al (1992). Small floc diameter should be attributed to Fig.…”

Section: Floc Sizecontrasting

confidence: 45%

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

Zhu

Peng

et al. 2007

Journal of Environmental Sciences

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The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under different influent substrate concentrations and aeration flow rates. Biological occurrence of simultaneous nitrification and denitrification was verified in the aspect of nitrogen mass balance and alkalinity. The experimental results also showed that there was a distinct linear relationship between simultaneous nitrification and denitrification and DO concentration under the conditions of low and high aeration flow rate. In each experimental run the floc sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.

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Section: Floc Sizecontrasting

confidence: 45%

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

Zhu

Peng

et al. 2007

Journal of Environmental Sciences

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“…The floc size distribution, which was not reported in the cited studies, has been suggested to largely affect oxygen mass transfer rates even in floccular biomass aggregates (Mueller et al 1966;Bakti and Dick 1992;Beccari et al 1992;Gapes 2003). Due to the oxygen mass transfer resistance, the DO concentration would not be uniform for bacteria inside different sized floccular aggregates.…”

Section: Investigation and Verification Of The Oxygen Affinity Theorymentioning

confidence: 91%

Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor

2007

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Partial nitrification to nitrite (nitritation) can be achieved in a continuous process without sludge retention by wash out of nitrite oxidising bacteria (NOB) while retaining ammonia oxidising bacteria (AOB), at elevated temperatures (the SHARON process) and, as demonstrated in this paper, also at low dissolved oxygen (DO) concentrations. Enriched AOB was attained at a low DO concentration (0.4 mg l(-1)) and a dilution rate of 0.42 day(-1) in a continuous process. A higher oxygen affinity of AOB compared to NOB seemed critical to achieving this. This was verified by determining the oxygen half saturation constant, Ko, with similar oxygen mass transfer resistances for enriched AOB and NOB as 0.033+/-0.003 mg l(-1) and 0.43+/-0.08 mg l(-1), respectively. However, the extent of nitritation attained was found to be highly sensitive to process upsets.

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“…Jiwani et al (1997) monitored several indices of oc morphology (size, compactness, and ÿlament numbers) and correlated them with the quality of the e uent and the dewaterability of the sludge. However, the e ects of oc structure, including the spatial distribution of microorganisms, intrinsic mass transfer resistance and possible substrate concentration distribution inside the oc, have not been incorporated into the activated sludge model (Bakti and Dick, 1992;Keller et al, 2002).…”

Section: Intra Oc Transportmentioning

confidence: 99%

Multiscale structures of biological flocs

Chu

Lee

2004

Chemical Engineering Science

101

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A model for a nitrifying suspended-growth reactor incorporating intraparticle diffusional limitation

Cited by 43 publications

References 20 publications

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor

Multiscale structures of biological flocs

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