Fluidized Bed Biofilm Reactor (FBBR)Kinetics – A Rational Design and Optimization Approach

1983 ◽  
Vol 15 (8-9) ◽  
pp. 321-332 ◽  
Author(s):  
Wen K Shieh ◽  
Leo T Mulcahy
Keyword(s):  
Mass Transfer ◽  
Fluidized Bed ◽  
Conversion Rate ◽  
Rational Design ◽  
Mass Transfer Rate ◽  
Zero Order ◽  
Biofilm Reactor ◽  
Design Parameters ◽  
Optimization Approach ◽  
Substrate Conversion

A mathematical model is presented for an intrinsic zero order, completely mixed fLuidized bed biofilm reactor(FBBR). Intrabiofilm mass transfer effects are considered. A modified Thiele modulus(ϕm) is defined to relate substrate conversion rate to intrabiofilm mass transfer rate through use of an effectiveness factor(η). For ϕm− < 1.15, intrabiofilm mass transfer is insignificant and intrinsic zero order kinetics is observed. For ϕm > 1.15, the FBBR substrate conversion rate is mass transfer limited and 0.45 order kinetics is observed. It is demonstrated via the FBBR model that media size and density and biofilm thickness are the most significant design parameters affecting FBBR performance. Selection of these parameters can be optimized through use of the equations presented herein. In addition, the effect of other important design parameters such as recycle rate and superficial upflow velocity on reactor performance can be assessed using the FBBR model outlined here.

A novel fast mass transfer anaerobic inner loop fluidized bed biofilm reactor for PTA wastewater treatment

2016 ◽  
Vol 74 (5) ◽  
pp. 1088-1095 ◽  
Author(s):  
Yingwen Chen ◽  
Jinlong Zhao ◽  
Kai Li ◽  
Shitao Xie
Keyword(s):  
Mass Transfer ◽  
Wastewater Treatment ◽  
Fluidized Bed ◽  
Terephthalic Acid ◽  
Oxygen Demand ◽  
Biofilm Reactor ◽  
Stable Chemical ◽  
Start Up ◽  
Operation Stability ◽  
Purified Terephthalic Acid

In this paper, a fast mass transfer anaerobic inner loop fluidized bed biofilm reactor (ILFBBR) was developed to improve purified terephthalic acid (PTA) wastewater treatment. The emphasis of this study was on the start-up mode of the anaerobic ILFBBR, the hydraulic loadings and the operation stability. The biological morphology of the anaerobic biofilm in the reactors was also analyzed. The anaerobic column could operate successfully for 46 days due to the pre-aerating process. The anaerobic column had the capacity to resist shock loadings and maintained a high stable chemical oxygen demand (COD) and terephthalic acid removal rates at a hydraulic retention time of 5–10 h, even under conditions of organic volumetric loadings as high as 28.8 kg COD·m−3.d−1. The scanning electron microscope analysis of the anaerobic carrier demonstrated that clusters of prokaryotes grew inside of pores and that the filaments generated by pre-aeration contributed to the anaerobic biofilm formation and stability.

scholarly journals Removal of Congo Red from Aqueous Solution by Circulating Fluidized Bed(CFB)

2021 ◽  
Vol 28 (2) ◽  
pp. 01-07
Author(s):  
Hamza Q. Ali ◽  
Ahmed A. Mohammed
Keyword(s):  
Mass Transfer ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Congo Red ◽  
Circulating Fluidized Bed ◽  
Mass Transfer Rate ◽  
Breakthrough Curves ◽  
Solution Flow Rate ◽  
Solution Flow ◽  
Bed Height

In this study circulating fluidized bed was adopted to remove of Congo Red from wastewater using Eichhornia crassipes as a adsorbent. Solution flow rate(6,12 and 18)l/hr, bed height(2,4 and 6) cm and Congo Red initaial concentration (10,25 and 50)mg/l were examined in experiments to show their effects on breakthrough curves and time required to reach the adsorbent to fully saturated curve. The mass transfer coefficient "KL"decreased with decreasing the liquid flow rate. The minimum fluidization velocities of bed found equal to 1.6, 2, 2.5 mm/s for heights of 2, 4,6 cm respectively. The increasing of the bed height will increase the contact time of the solute in the bed, and these improve the solute removal efficiency. the increasing in flow rate and initial concentration will increase the mass transfer rate.

Process Analysis of Fluidized Bed Biofilm Reactor for Denitrification

1987 ◽  
Vol 19 (1-2) ◽  
pp. 151-162 ◽  
Author(s):  
H. Harada ◽  
H. Ando ◽  
K. Momonoi
Keyword(s):  
Mathematical Model ◽  
Fluidized Bed ◽  
Process Analysis ◽  
Biofilm Reactor ◽  
Dynamic State ◽  
Bulk Liquid ◽  
Biofilm Thickness ◽  
Substrate Conversion ◽  
Denitrification Reactor ◽  
Denitrification Process

A mathematical model is proposed herein to describe the dynamic behavior of the denitrification process in a fluidized bed biofilm reactor. The model basically consists of the following four submodels: bioparticles fluidization, bulk liquid flow pattern, substrate conversion within biofilm and biofilm thickness development. As for intrinsic denitrification reaction, a consecutive two-step reaction kinetics with nitrite as an intermediate product is adopted. All parameters needed for simulation were experimentally determined. Verification of the model was obtained in a dynamic state using a laboratory-scale fluidized bed denitrification reactor under well defined conditions.

scholarly journals Adsorption of Congo red Dye from Aqueous Solution onto Wheat Husk in a Fluidized Bed Reactor

2019 ◽  
Vol 20 (4) ◽  
pp. 55-60
Author(s):  
Israa Sabah ◽  
Abeer I. Alwared
Keyword(s):  
Mass Transfer ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Congo Red ◽  
Mass Transfer Rate ◽  
Particle Diameter ◽  
Fluidized Bed Reactor ◽  
Breakthrough Curves ◽  
Operating Conditions ◽  
Wheat Husk

The purpose of this paper is to examine absorbance for the removal of the Red Congo using wheat husk as a biological pesticide. Several experiments have been conducted with the aim of configuring breakthrough data in a fluidized bed reactor. The minimum fluidized velocities of the bed were found to be 0.031 mm/s for mish sizes of (250) µm diameter with study the mass transfer be calculated KL values. The results showed a well-fitting with the experimental data. Different operating conditions were selected: bed height (2, 5 and 10) cm, flow rate (90, 100and 120) ml/sec and particle diameter (250, 600, 1000) µm. The breakthrough curves were plotted for Congo Red, Values showed that the lower the bed, the lower the number of adsorbents and the potential of the weak bed to condense the density of the solution, which also increases the flow rate and will increase the mass transfer rate.

INVESTIGATION ON HYDRODYNAMICS OF FLUIDIZED BED AS A COMPONENT DETERMINING HEAT AND MASS TRANSFER

1974 ◽  
Author(s):  
N. B. Kondukov ◽  
L.I. Frenkel ◽  
M. B. Kliot ◽  
B. V. Pankov ◽  
V. S. Potapochkin ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Fluidized Bed
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