Biological wastewater treatment in the inverse fluidised bed reactor

Sokól̵, Wl̵odzimierz; Ambaw, Alemayehu; Woldeyes, Belay

doi:10.1016/j.cej.2008.12.021

Cited by 26 publications

(11 citation statements)

References 20 publications

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“…Thus, for the u smaller than 0.041 m/s, oxygen was the limiting factor for biomass growth. On the other hand, for the air velocities greater than 0.041 m/s, the degradation rate of the constituents of the wastewaters was the controlling factor of the treatment process [3].…”

Section: Resultsmentioning

confidence: 99%

“…In a FBBR containing low-density particles, fluidiza-tion can be conducted either by an upward co-current flow of gas and liquid through a bed (Figure 1) [2,3] or by a downward flow of liquid and countercurrent upward flow of gas [5,14]. In the former, fluidization is achieved by an upward flow of gas whereby the gas bubbles make the bed expanding downwards into the less dense mixture of gas and liquid.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, a FBBR is capable of achieving treatment in low retention time because of the high biomass concentrations that can be achieved in the apparatus [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Inverse Fluidized Bed Biological Reactor for Treating High-Strength Industrial Wastewaters

Sokól̵¹,

Woldeyes²

2011

ACES

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The aim of this work was to investigate the aerobic degradation of high-strength industrial (refinery) wastewaters in the inverse fluidized bed biological reactor, in which polypropylene particles of density 910 kg/m 3 were fluidized by an upward flow of gas through a bed. Measurements of chemical oxygen demand (COD) versus residence time t were performed for various ratios of settled bed volume to reactor volume (V b /V R ) and air velocities u. The largest COD reduction, namely, from 54,840 to 2190 mg/l, i.e. a 96% COD decrease, was achieved when the reactor was operated at the ratio (V b /V R ) = 0.55, air velocity u = 0.046 m/s and t = 65 h. Thus, these values of (V b /V R ), u and t can be considered as the optimal operating parameters for a reactor when used in treatment of high-strength refinery wastewaters. In the treatment operation conducted in a reactor optimally controlled at (V b /V R ) = 0.55, u = 0.046 m/s and t = 65 h, the conversions obtained for all phenolic constituents of the wastewater were larger than 95%. The conversions of about 90% were attained for other hydrocarbons.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Inverse Fluidized Bed Biological Reactor for Treating High-Strength Industrial Wastewaters

Sokól̵¹,

Woldeyes²

2011

ACES

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“…On the other hand, the same treatment can be achieved in a fluidized bed biofilm reactor (FBBR) in retention time of several hours [1,3]. The fluidized bed technology owes its high-rate success to much higher surface area and biomass concentration than those that can be achieved in the conventional treatment processes.…”

Section: Introductionmentioning

confidence: 99%

“…The application of the inverse FBBR, in which a bed consisting of low density (matrix particle density smaller than that of liquid) particles expands downwards during fluidization, allows the control of biomass loading and provides the high oxygen concentration in the reacting liquid media [1,3].…”

Section: Introductionmentioning

confidence: 99%