Development and Scale-Up of an Aerobic Biofilm Air-Lift Suspension Reactor

A new aerobic treatment concept for the aerobic oxidation of COD, ammonia and sulphide has been developed. The concept is based on the formation of biofilms on small suspended particles in an air-lift reactor. This reactor concept enables to combine a low sludge loading with a high volumetric loading. This makes the reactor especially useful for e.g. nitrification processes. It is also feasible to operate under conditions of marginal sludge production. In this article the scale up aspects of such a process are discussed.

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97/02421 Experimental confirmation of the theoretical prediction of the gas hold up and circulation velocity in internal loop air lift reactor and the possibilities of scale up

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(97)88334-8 ◽

1997 ◽

Vol 38 (3) ◽

pp. 192

Keyword(s):

Theoretical Prediction ◽

Scale Up ◽

Experimental Confirmation ◽

Internal Loop ◽

Circulation Velocity ◽

Air Lift Reactor ◽

Air Lift

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Effect of Dye Concentration on Adsorption Efficiency in the Air-Lift Reactor

Polish Journal of Natural Science ◽

10.2478/v10020-007-0040-5 ◽

2007 ◽

Vol 22 (3) ◽

pp. 447-458

Author(s):

Urszula Filipkowska ◽

Aneta Hołownia-Kosak

Keyword(s):

Adsorption Efficiency ◽

Air Lift Reactor ◽

Air Lift

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Ozonation combined with ultrasound for the degradation of tetracycline in a rectangular air-lift reactor

Separation and Purification Technology ◽

10.1016/j.seppur.2011.06.035 ◽

2012 ◽

Vol 84 ◽

pp. 138-146 ◽

Cited By ~ 59

Author(s):

Yan Wang ◽

Hui Zhang ◽

Lu Chen ◽

Sheng Wang ◽

Daobin Zhang

Keyword(s):

Air Lift Reactor ◽

Air Lift

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Degradation of C.I. Acid Orange 7 by ultrasound enhanced ozonation in a rectangular air-lift reactor

Chemical Engineering Journal ◽

10.1016/j.cej.2007.06.031 ◽

2008 ◽

Vol 138 (1-3) ◽

pp. 231-238 ◽

Cited By ~ 43

Author(s):

Hui Zhang ◽

Yujuan Lv ◽

Fang Liu ◽

Daobin Zhang

Keyword(s):

Acid Orange 7 ◽

Acid Orange ◽

Air Lift Reactor ◽

Air Lift

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Nucleation Triggering of Highly Undercooled Xylitol Using an Air Lift Reactor for Seasonal Thermal Energy Storage

10.20944/preprints201812.0179.v1 ◽

2018 ◽

Author(s):

Marie DUQUESNE ◽

Elena PALOMO DEL BARRIO ◽

Alexandre GODIN

Keyword(s):

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage ◽

High Energy ◽

Operating Conditions ◽

High Energy Density ◽

Bubble Generation ◽

Spontaneous Nucleation ◽

Air Lift Reactor ◽

Air Lift

Xylitol is an organic, non-toxic, biosourced phase change material with high potential for seasonal thermal energy storage material. It has a high energy density, a high and stable undercooling allowing storing solar energy at ambient temperature thus, reducing thermal losses and the risk of spontaneous nucleation (i.e., the risk of losing the stored energy). When the energy is needed, the discharge triggering of the storage system (i.e., Nucleation triggering of highly viscous undercooled Xylitol) is very difficult as well as reaching a sufficient power delivery (i.e., the control of the subsequent crystal growth rates). Both are the mains locks for the use of Xylitol in seasonal energy storage. Different techniques to crystallize highly undercooled Xylitol have hence been considered. It has been proven that nucleation triggering of highly undercooled Xylitol using an air lift reactor would allow reaching performances matching with building applications (i.e., at medium temperatures, below 100 °C). The advantages of this technique compared to other existing techniques to activate the crystallization are discussed. The mechanisms triggering the nucleation are investigated. The air bubble generation, transportation of nucleation sites and subsequent crystallization are discussed to improve the air injection operating conditions.

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An experimental study of the minimum fluidization velocity in a three-phase external-loop air-lift reactor

Chemical Engineering Science ◽

10.1016/0009-2509(88)85076-0 ◽

1988 ◽

Vol 43 (5) ◽

pp. 1161-1165 ◽

Cited By ~ 14

Author(s):

Duško Pošarac ◽

Dragan Petrović

Keyword(s):

Experimental Study ◽

Minimum Fluidization Velocity ◽

Fluidization Velocity ◽

External Loop ◽

Minimum Fluidization ◽

Three Phase ◽

Air Lift Reactor ◽

Air Lift

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Studies on Microbial Leaching of Heavy Metals from Municipal Sludge

Water Science & Technology ◽

10.2166/wst.1990.0117 ◽

1990 ◽

Vol 22 (12) ◽

pp. 229-238 ◽

Cited By ~ 22

Author(s):

R. D. Tyagi ◽

D. Couillard ◽

F. T. Tran

Keyword(s):

Ammonia Nitrogen ◽

Filter Press ◽

Vacuum Filter ◽

Continuous Stirred Tank Reactor ◽

Microbial Leaching ◽

Anaerobically Digested Sludge ◽

Air Lift Reactor ◽

Solid Liquid ◽

Air Lift ◽

Metal Solubilization

A comparative study between continuous stirred tank reactor (CSTR) with cell recycle and air-lift reactor was carried out in 30 1 capacity reactors for metal solubilization from anaerobically digested sludge. In CSTR at a residence time of 0.75 day, supplementing the feed sludge with 4 g/l of FeSO4.7H2O, using 20% sludge recycle and adjusting pH of the feed sludge to 4.5 resulted in following metal solubilization : 91% Cu, 94% Zn,, 93% Mn, 67% Cd, 67% Ni, 8% Cr, and 7% Pb. At 0.75 day retention time metals were solubilized to the recommended level in CSTR as well as in air-lift reactor. The treated sludge is easy to filter in plates filter press, centrifugation, or vacuum filter. The sludge nutrients do not seem to be diminished as a result of treatment and separation of solid-liquid. The ammonia-nitrogen fraction seems to be transformed in organic nitrogen. The decontaminated sludge produced has less odour.

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Formation of Biofilms in a Biofilm Air-Lift Suspension Reactor

Water Science & Technology ◽

10.2166/wst.1992.0445 ◽

1992 ◽

Vol 26 (3-4) ◽

pp. 647-654 ◽

Cited By ~ 34

Author(s):

J. J. Heijnen ◽

M. C. M. van Loosdrecht ◽

A. Mulder ◽

L. Tijhuis

Keyword(s):

Biofilm Formation ◽

Hydraulic Retention Time ◽

Loading Rate ◽

Single Cells ◽

Particle Interactions ◽

Particle Characteristics ◽

Biofilm Detachment ◽

Stage Process ◽

Volumetric Loading ◽

Air Lift

Biofilm Air-lift Suspension reactors can be used to treat waste water at a high volumetric loading rate combined with a low sludge loading. The biofilms are formed on small suspended particles (r = 0.1 mm). We have studied the effect of particle characteristics and hydraulic retention time on the biofilm formation. It is shown that small, rough particles show the best biofilm formation. Low hydraulic retention times benefit the formation of biofilms. This results from the fact that suspension growth is minimal under these conditions. The effect of biofilm detachment became distinct from the observation that most of the bacterial growth in the biofilm is transferred to the liquid. The biofilm formation process is concluded to be a three stage process: (i) the outgrowth of single cells to micro-colonies, this process is positively influenced by the carrier surface roughness; (ii) the outgrowth of micro-colonies to small biofilms, this process is negatively influenced by the concentration of carrier material; (iii) the outgrowth of biofilms, this occurs when the majority of particles are covered with a biofilm. At that time the influence of shear due to particle-particle interactions diminishes.

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