scholarly journals Critical Tractive Velocity and Deposition of Sponge Media in Fluidized-bed Biofilm Reactor

2012 ◽  
Vol 48 (2) ◽  
pp. 45-53
Author(s):  
MITSUHARU TERASHIMA ◽  
HIDENARI YASUI ◽  
HIROSHI TAKAHASHI
Keyword(s):  
Fluidized Bed ◽  
Biofilm Reactor ◽  
Sponge Media

scholarly journals Kinetic Modeling of Fluidized-Bed Biofilm Reactor for Lake Water Treatment.

1999 ◽  
Vol 22 (5) ◽  
pp. 389-395 ◽  
Author(s):  
Noriyo NISHIJIMA ◽  
Tetsuya TANAKA ◽  
Kouichi TSUZUKI ◽  
Takeo TAKAGI
Keyword(s):  
Water Treatment ◽  
Fluidized Bed ◽  
Kinetic Modeling ◽  
Lake Water ◽  
Biofilm Reactor

Characteristics of an air-fluidized-bed biofilm reactor system with a multi-media filter

1994 ◽  
Vol 30 (11) ◽  
pp. 101-110
Author(s):  
Toshiaki Tsubone ◽  
Seiichi Kanamori ◽  
Tatsuo Takechi ◽  
Masahiro Takahashi
Keyword(s):  
Particle Size ◽  
Fluidized Bed ◽  
Suspended Solids ◽  
Pilot Scale ◽  
Biofilm Reactor ◽  
Reactor System ◽  
Multi Media ◽  
Bod Removal

A pilot scale study was conducted using an Air-Fluidized-Bed Biofilm Reactor (AFBBR) system with a Multi Media Filter (MMF). Soluble BOD (S-BOD) concentration in the effluent of the AFBBR had a correlation with total BOD (T-BOD) and Suspended Solids (SS) concentration in the effluent of the MMF. The lower the S-BOD in the effluent of the AFBBR was, the lower was not only T-BOD but also SS in the effluent of the MMF. It was found that as treatment proceeded, S-BOD was removed and the particle size of SS increased in the AFBBR. These results suggested that the mechanism of BOD removal in this system was: S-BOD was removed and a part of the S-BOD was changed to SS and the particle size of the SS increased in the AFBBR, and then the SS was removed by the MMF. Thus not only the T-BOD but also the SS in the effluent of MMF was lower when the S-BOD in the effluent of the AFBBR was lower. When the S-BOD in the effluent of the AFBBR was 8mg/L, T-BOD and the SS in the effluent of the MMF were 10mg/L and 4mg/L, respectively. In order to have an average S-BOD value in the effluent of the AFBBR of about 8mg/L, the T-BOD loading and the S-BOD loading needed to be less than 1.3kg/m3/day and 0.45 kg/m3/day, respectively. Even when the BOD loading was high, nitrification still occurred in this system.

Study of Biofilm and Fluidization of Bioparticles in a Three-Phase Liquid-Fluidized-Bed Reactor

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1347-1354 ◽  
Author(s):  
F. Trinet ◽  
R. Heim ◽  
D. Amar ◽  
H. T. Chang ◽  
B. E. Rittmann
Keyword(s):  
Fluidized Bed ◽  
Liquid Velocity ◽  
Substrate Surface ◽  
Biofilm Reactor ◽  
Strongly Correlated ◽  
Polysaccharide Content ◽  
High Particle ◽  
Air Turbulence ◽  
Three Phase ◽  
Phase Liquid

A three-phase, liquid-fluidized-bed biofilm reactor was operated over wide ranges of liquid velocity, air velocity, medium concentration, and substrate surface loading. The biofilm characteristics (total colonization, polysaccharide content, density, and thickness) and the specific detachment coefficient (bs) were determined by a combination of experimental measurements and a hydrodynamic model. The results demonstrated that dense and thin biofilms were induced by the physical condition of high particle-to-particle contacts and high liquid turbulence. The biofilm's polysaccharide content was increased by increased air turbulence and a low substrate availability. The specific detachment coefficient, bs, was strongly correlated to the concentration of the medium (negatively) and the polysaccharide content (positively). Overall, the bs can be controlled significantly by the gas and liquid velocities; increasing either velocity tends to increase bs.

Dynamical modelling of an anaerobic digestion fluidized bed reactor

1997 ◽  
Vol 36 (5) ◽  
pp. 285-292 ◽  
Author(s):  
Benjamin Bonnet ◽  
Denis Dochain ◽  
Jean-Philippe Steyer
Keyword(s):  
Fluidized Bed ◽  
Solid Phase ◽  
Biofilm Reactor ◽  
Momentum Balance ◽  
Balance Equations ◽  
Biological Variables ◽  
Dynamical Simulation ◽  
Model Derivation ◽  
The Stability ◽  
Bed Expansion

One of the main difficulties in modelling a Fluidized Bed Biofilm Reactor (FBBR) is to take into account hydraulic phenomena (such as bed expansion) and its interactions with the biological variables. In this paper, we shall present a dynamical model of the process, analyse the stability of the hydrodynamics and illustrate its performances in simulation. A key feature of the model is that it combines mass balance of the process components with momentum balance equations in order to emphasise the different hydrodynamics of the liquid phase and of the solid phase, and the interactions between both phases. The model derivation finally leads to a set of partial differential equations (PDE). This model is intended to be used as a basis for the derivation of controllers and for dynamical simulation.

Treatment of Slaughterhouse Wastewater Using Fluidized Bed Biofilm Reactors

1987 ◽  
Vol 19 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
Chun T. Li ◽  
Wen K. Shieh ◽  
Chun S. Wu ◽  
Ju S. Huang
Keyword(s):  
Fluidized Bed ◽  
Cost Effective ◽  
Maximum Amount ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
High Concentration ◽  
Slaughterhouse Wastewater ◽  
Chemical Coagulation ◽  
Biofilm Reactors ◽  
Cost Effective Alternative

The oxygenic fluidized bed biofilm reactor(FBBR) was evaluated in a laboratory investigation for treatment of pig slaughtering wastewater (slaughterhouse wastewater). Because the slaughterhouse wastewater contains a high concentration of grease, chemical coagulation/flocculation was adopted as the pretreatment step prior to FBBR treatment. The performance of the FBBR was evaluated at BOD loadings of between 8.5 to 98.5 kg/m3-day, hydraulic retention times of between 8.8 to 30.8 minutes, recirculation ratios of between 1 to 6, and feed BOD concentrations of between 305 to 602 mg/L. Under these operating conditions, removal efficiencies of BOD, grease, and NH3-N were in the range of 71 to 94%, 29 to 84%, and 20 to 73%, respectively. Both BOD and grease of the slaughterhouse wastewater used could be lowered to 40 and 10 mg/L, respectively, at a BOD loading of 20 kg/m3-day in order to meet effluent requirements to be enforced in Taiwan in 1990. Because the maximum amount of oxygen that could be dissolved in the oxygenation device used in this investigation was 40 mg/L, the FBBR would become anaerobic when the BOD loading applied exceeded 50 kg/m3-day. Relatively constant biomass holdups (10,000 mg TVS/L) could be maintained in FBBRs over the BOD loadings applied via the practice of regular biofilm separation and biomass wasting. The combined chemical coagulation/flocculation-FBBR process provides a feasible and cost-effective alternative for treatment of slaughterhouse wastewater.

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