Prediction of optimal biofilm thickness for membrane-attached biofilms growing in an extractive membrane bioreactor

Pavasant, Prasert; Santos, L. M. Freitas dos; Pistikopoulos, Efstratios N.; Livingston, Andrew G.

doi:10.1002/(sici)1097-0290(19961105)52:3<373::aid-bit3>3.0.co;2-h

Cited by 34 publications

(14 citation statements)

References 26 publications

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“…However, during the first week the decrease observed in the suspended JS150 concentration (Fig. 3) suggested the initialization of the attachment process (Pavasant et al, 1996). This was shown by the microscopic observations of membranes after 2 days of incubation (Photo 2A1-3).…”

Section: Discussionmentioning

confidence: 99%

Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Jorge

Livingston²

2000

Biotechnol. Bioeng.

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Section: Discussionmentioning

confidence: 99%

Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Jorge

Livingston²

2000

Biotechnol. Bioeng.

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“…The growth reactions is: The endogenous decay reactions is: The model is similar in form to that described by Pavasant et al (1996) for an extractive membrane bioreactor, but the method adopted for solution is different. MABR performance has previously been modelled by Casey et al (1999a) considering only the growth reaction by adapting a model proposed by Karel and Robertson (1987) for cosubstrates diffusing from opposite sides of a catalyst.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Biofilm development in a membrane-aerated biofilm reactor: effect of intra-membrane oxygen pressure on performance

Casey

Glennon

Hamer

2000

Bioprocess Engineering

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The effect on intra-membrane oxygen pressure at a constant carbon substrate loading rate on the development of bio®lms of Vibrio natrigens in a membrane aerated bio®lm reactor (MABR) was investigated experimentally and by mathematical modelling. A recently reported technique (Zhang et al., 1998. Biotechnol. Bioeng. 59: 80±89) for the in situ measurement of the substrate diffusion coef®cients in a growing bio®lm and the mass transfer coef®cients in the boundary layer at the bio®lm liquid interface was used. This aided the study of the effect of the heterogeneous bio®lm structure and also improved the reliability of the model predictions. The different intramembrane oxygen pressures used, 12.5, 25 and 50 kPa, with acetate as the carbon substrate, showed a marked effect on the initial bio®lm growth rate, on acetate removal rate, particularly in thick bio®lms and on bio®lm structure. The model predicted the substrate limitation regimes, the location of the active biomass layer within the bio®lms and the trends in oxygen uptake rate through the membrane into the bio®lms. During the development of the bio®lms, the bio®lm thickness and the intra-membrane oxygen pressure were found to be the most important parameters in¯uencing the MABR performance while the effect of bio®lm structure was less marked.List of symbols C x,f bio®lm density, kg m )3 D diffusion coef®cient in water, m 2 s )1 D c diffusion coef®cient in bio®lm, m 2 s )1 H Henry's law constant, Pa m 3 mol )1 k L mass transfer coef®cient in the concentration boundary layer at the bio®lm-liquid interface, m s )1 k o overall mass transfer coef®cient, m s )1 P M membrane permeability, mol m )1 s )1 Pa )1 r i inner radius of membrane, m r M outer radius of membrane, m Y x/s yield coef®cient of biomass on substrate, kg kg )1 d bio®lm thickness, m k dimensionless bio®lm thickness cParameter de®ned in Eq.(3) eParameter de®ned in Eq. (4) m dimensionless location of the active biomass layer in the bio®lm l max maximum speci®c growth rate of the bio®lm, h )1

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“…Pavasant et al [26] experimentally investigated single tube extractive membrane bioreactors (STEMB). These systems are used for biotreatment of wastewaters with volatile organic compounds (VOCs), saline wastewater, and for nitrification purposes.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

“…Thus the results of the dissolved phase when incorporating transient aspects and osmotic pressure can be summarized as C j ðx; tÞ ¼ a Comparison of the present work with experimental results from the study on single tube extractive membrane bioreactors (STEMB) conducted by Pavasant et al[26].Parameters used: k = 24 g/m 3 , k 1 = 0.27, D = 283 Â 10 À6 m 2 /day, q = 200,000 g/m 3 ,C b = 2 g/m 3 , d 0 = 5 Â 10 À6 m, k = 55 m À1 day À1 .Comparison of the present work with the averaged thickness from the three dimensional numerical results of Alpkvist et al[18]. Parameters used: k = 24 g/m 3 , k 1 = 0.27, D = 1 Â 10 À4 m 2 /day, q = 200,000 g/m 3 , C b = 2 g/m 3 , d 0 = 5 Â 10 À6 m, k = 1200 m À1 day À1 .…”

mentioning

confidence: 99%

Analysis of biofilm growth in the presence of osmotic pressure and temperature effects

Ahmed¹,

Vafai²

2012

International Journal of Heat and Mass Transfer

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a b s t r a c tTransient mass transfer in a diffusion-reaction biofilm with a moving boundary was investigated analytically. The analysis incorporates both the diffusion processes into the biofilm as well as the reaction processes that lead to the expansion of the system. For first and second order reaction terms, the biofilm synthesis as a function of time was presented. The temporal development of the biomass was found to be in very good agreement with numerical results. The effects of osmotic pressure and temperature were also investigated and it was found that osmotic pressure plays a significant role in first order reactions but the temperature dependence is primarily found in the reaction kinetics and does not significantly influence osmotic pressure effects.

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Prediction of optimal biofilm thickness for membrane-attached biofilms growing in an extractive membrane bioreactor

Cited by 34 publications

References 26 publications

Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Biofilm development in a membrane-aerated biofilm reactor: effect of intra-membrane oxygen pressure on performance

Analysis of biofilm growth in the presence of osmotic pressure and temperature effects

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