Evaluation of kinetic parameters of biochemical reaction in three-phase fluidized bed biofilm reactor for wastewater treatment

Hirata, Akira; Takemoto, Takeshi; Ogawa, Kensuke; Auresenia, Joseph; Tsuneda, Satoshi

doi:10.1016/s1369-703x(00)00051-6

Cited by 18 publications

(16 citation statements)

References 21 publications

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“…Many investigations on the flow pattern in an AFBR suggested that an axially dispersed plug flow model can be used for the flow model (Hirata et al, 2000;Seok and Komisar, 2003). In these studies the effect of gas production on the flow pattern was not considered.…”

Section: Effect Of Gas Production On Hydrodynamicsmentioning

confidence: 99%

“…This test showed a reasonable agreement between the zero-order kinetic model with complete substrate penetration and the experimental data. Hirata et al (2000) used a different approach to evaluate the kinetic parameters of the biochemical reactions taking place in a three phase fluidized bed reactor. Using the substrate balance at steady state and assuming Monod kinetics, an equation relating the substrate consumption rate to substrate concentration (expressed as Biochemical Oxygen Demand, BOD 5 ) and total biofilm surface area was established.…”

Section: Kinetic and Reactor Sub-modelsmentioning

confidence: 99%

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Modelling anaerobic biofilm reactors—A review

Saravanan

Sreekrishnan

2006

Journal of Environmental Management

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Section: Effect Of Gas Production On Hydrodynamicsmentioning

confidence: 99%

Section: Kinetic and Reactor Sub-modelsmentioning

confidence: 99%

Modelling anaerobic biofilm reactors—A review

Saravanan

Sreekrishnan

2006

Journal of Environmental Management

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“…Microbial growth models, based on those of Monod, have been studied by many (Hirata et al 2000;Peyton et al 2002). However, they have generally not described biodegradation and have not considered the influence of the initial substrate concentration on the growth rate.…”

Section: Kinetic Modellingmentioning

confidence: 99%

Biodegradation of naphthalene-2-sulfonic acid present in tannery wastewater by bacterial isolates Arthrobacter sp. 2AC and Comamonas sp. 4BC

2005

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Two bacterial strains, 2AC and 4BC, both capable of utilizing naphthalene-2-sulfonic acid (2-NSA) as a sole source of carbon, were isolated from activated sludges previously exposed to tannery wastewater. Enrichments were carried out in mineral salt medium (MSM) with 2-NSA as the sole carbon source. 16S rDNA sequencing analysis indicated that 2AC is an Arthrobacter sp. and 4BC is a Comamonas sp. Within 33 h, both isolates degraded 100% of 2-NSA in MSM and also 2-NSA in non-sterile tannery wastewater. The yield coefficient was 0.33 g biomass dry weight per gram of 2-NSA. A conceptual model, which describes the aerobic transformation of organic matter, was used for interpreting the biodegradation kinetics of 2-NSA. The half-lives for 2-NSA, at initial concentrations of 100 and 500 mg/l in MSM, ranged from 20 h (2AC) to 26 h (4BC) with lag-phases of 8 h (2AC) and 12 h (4BC). The carbon balance indicates that 75-90% of the initial TOC (total organic carbon) was mineralized, 5-20% remained as DOC (dissolved organic carbon) and 3-10% was biomass carbon. The principal metabolite of 2-NSA biodegradation (in both MSM and tannery wastewater) produced by Comamonas sp. 4BC had a MW of 174 and accounted for the residual DOC (7.0-19.0% of the initial TOC and 66% of the remaining TOC). Three to ten percent of the initial TOC (33% of the remaining TOC) was associated with biomass. The metabolite was not detected when Arthrobacter sp. 2AC was used, and a lower residual DOC and biomass carbon were recorded. This suggests that the two strains may use different catabolic pathways for 2-NSA degradation. The rapid biodegradation of 2-NSA (100 mg/l) added to non-sterile tannery wastewater (total 2-NSA, 105 mg/l) when inoculated with either Arthrobacter 2AC or Comamonas 4BC showed that both strains were able to compete with the indigenous microorganisms and degrade 2-NSA even in the presence of alternate carbon sources (DOC in tannery wastewater = 91 mg/l). The results provide information useful for the rational design of bioreactors for tannery wastewater treatment.

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“…Bed expansion studies were conducted to develop a correlation between liquid upflow velocity and bed void fraction. Many investigations on flow pattern in an AFBR suggested that the effect of gas production on bed expansion is negligible (Diez-Blanco et al, 1995;Hirata et al, 2000;Seok and Komisar, 2003). Hence, in the present model the bed expansion studies were conducted for different liquid upflow velocities without considering the gas effect.…”

Section: Bed Fluidization Modelmentioning

confidence: 99%

“…The flow inside an anaerobic fluidized bed reactor has been modelled using axial dispersion model (Lin, 1991;Buffiere et al, 1998;Seok and Komisar, 2003). Some authors have modelled them as completely mixed reactor as well (Hirata et al, 2000). This paper presents the model development for the HAR and the validation of model predictions with the experimental data generated through laboratory and pilot scale experiments.…”

Section: Introductionmentioning

confidence: 99%