Traitement des effluents d’huileries par un procédé combinant un traitement intensif (Jet‐Loop Reactor) suivi d’un traitement extensif (bassins de stabilisation)

Jail, A.; Boukhoubza, F.; Nejmeddine, A.; Duarte, Júlio César; Sayadi, Sami; Hassani, Lahcen

doi:10.1080/09593330903552086

Cited by 11 publications

(7 citation statements)

References 40 publications

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“…In aerated ponds, ISSN 0959-3330 print/ISSN 1479-487X online wastewater is usually stored in large, deep basins with a long retention time [21]. The most common ponds are aerobicanaerobic, where low-intensity aeration is provided (less than 2.5 W/m 3 ), determining low concentrations of dissolved oxygen (DO) and suspended solids; the sludge settles at the bottom where it is subjected to anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Zema

Andiloro

Bombino

et al. 2012

Environmental Technology

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Citrus processing wastewater was treated in aerated pilot plants in order to evaluate the following: (a) energy efficiency under different air flow rates and times; and (b) limits of spontaneous microflora in adapting to essential oils. In comparison to permanent air flow, night aeration for 12 hours determined an increase of up to 12% of the monthly removal rate of chemical oxygen demand (COD) and a consequent reduction by 10% of energy consumptions per unit of COD removed from 0.63 to 0.57 kWh/kg COD . Lowering night aeration from 14 to 7 l/m 3 /h reduced by only 10% the removal rate of COD; the energy consumption per unit of COD removed (0.32 kWh/kg COD ) was consequently reduced by more than 40%. Dissolved oxygen was maintained at very low level, rarely exceeding 0.2 ppm, with no bad smell. The consequent high oxygen deficit of 98-99% of saturation induced high oxygen transfer efficiency. The microbial population was characterized mainly by aerobic bacteria; only 5-8% of bacteria were strictly anaerobic. In the deep tank layer under the air diffuser a small amount of sludge settled (0.03-0.04 kg of dry matter per kg of COD removed), containing only 3% of total organic matter detected at the end of the depuration process. The fact that the concentration of essential oils could be progressively increased up to 1400 ppm without noticeably slowing down the biological processes demonstrated the remarkable microbial adaptation.

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Section: Introductionmentioning

confidence: 99%

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Zema

Andiloro

Bombino

et al. 2012

Environmental Technology

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“…Under these conditions, the JLR presented an intermediate energy consumption ranging from 51 to 700 W m −3 , and the pump efficiency was estimated between 12% and 64% using Eqn. (14). Typical P/V values of JLR ranged from 50 to 5200 W m −3 with Q L values varying from 2 to 70 L min −1 .…”

Section: Energetic Oxygen Transfer Efficiencymentioning

confidence: 98%

“…2,5,7 Additionally, various alternative designs of bioreactors are being studied for the biotransformation of vegetable oil into useful products, including an airliftbiofilm reactors, 8 membrane bioreactors, 9,10 and lately, the jetloop reactor. [11][12][13][14] The basic jet-loop reactor design is a cylindrical vessel with a high H/D ratio (>5) and an external pump that quickly recycles the liquid within the vessel through an external loop. [15][16][17][18] The recycled liquid is passed through an ejector that generates intense turbulence at high jet flow rates favoring the mass transfer and mixing of multiphase systems, such as an aqueous-oil-air system.…”

Section: Introductionmentioning

confidence: 99%

“…However, little experimental effort has been carried out to explore the potential use of the jet‐loop reactor within the field of biotechnology. It has been mainly used for the removal of pollutants (such as methanol) from the air, 20 the treatment of brewery and winery wastewater, 21‐23 phenol bioremoval, 24 and the treatment of agro‐industrial effluents 11‐14 . Finally, only a few studies have evaluated the jet‐loop hydrodynamics under microorganism culture conditions, such as viscosity and ionic strength of a culture medium, 18,20 or in the presence of microorganisms 20,25 …”

Section: Introductionmentioning

confidence: 99%

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Intensification of multiphase systems with a jet‐loop reactor: characterization of mass transfer, mixing time, drop oil size, and biomass growth

Bourguett‐Rosas,

Arenas‐García,

Vergara‐Porras

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe development of processes for transforming vegetable oils into useful products has received increasing attention in the biotechnological field. The reactor used for this purpose should meet adequate mass transfer, mixing and oil dispersion conditions. In this work comprehensive research into the use of a jet‐loop reactor as a potential alternative to airlift and stirred tank reactors was conducted in presence of avocado oil in a water‐air system. Additionally, the assessment of the jet‐loop for biomass growth in presence of oil was performed.RESULTSThe increase of avocado oil from 1 to 5 % v/v resulted in a reduction in the performance of the three reactors. Despite the airlift reactor having the lowest power input, it exhibited the worst performance in terms of mass transfer, mixing and oil dispersion. The estimation of the energetic oxygen transfer efficiency (Kg O2 KW‐1 h‐1) allowed the determination that the jet‐loop reactor was superior to the stirred tank. This superiority was attributed to the low values of the mixing time and oil droplet diameter observed in the jet‐loop reactor. Finally, all these parameters had a positive impact on the growth of Wautersia eutropha in the jet‐loop reactor compared with the other two reactors.CONCLUSIONSThe results showed that the jet‐loop reactor presented superior performance in most cases compared to the stirred tank and airlift reactors. Particularly, the jet‐loop exhibits an interesting potential to reduce the size of the avocado oil droplets, which could lead to a significative increase in the growth rate of Wautersia eutropha.This article is protected by copyright. All rights reserved.

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“…In aerated lagoons, wastewater is usually stored in large and deep basins with long retention time (Jail et al, 2010). The most common lagoons are aerobic-anaerobic with low-intensity aeration (less than 2.5 W m -3 ) determining low concentrations of dissolved oxygen (DO) and suspended solids; the sludge settles at the bottom where it is subject to anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

Aerated lagooning of agro-industrial wastewater: depuration performance and energy requirements

Andiloro¹,

Bombino²,

Tamburino³

et al. 2013

J Agricult Engineer

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Intensive depuration plants have often shown low reliability and economic sustainability, when utilised for agro-industrial wastewater treatment, due to the particular wastewater properties: high organic load and essential oil concentrations, acidity, nutrient scarcity and qualitative-quantitative variability of effluents. Aerated lagooning systems represent a suitable alternative, because they are able to assure good reliability and low energy requirements, avoiding the drawbacks shown by the intensive depuration plants. In order to optimize performance of the lagooning systems, particularly in terms of energy requirements, depuration processes of aerobic-anaerobic aerated lagoons were investigated, both at full- and laboratory-scale. Citrus processing wastewater were subject to bubble aeration with low flow rates and limited time; the removal rate of organic load was evaluated and energy requirements of different depuration schemes were compared. The experimental investigations in full-scale aerated lagoons showed a low energy supply (0.21-0.59 kWh per kg of COD (Chemical Oxygen Demand) removed with an average value of 0.45 kWh kgCOD –1), an adequate equalisation capability and constantly good depurative performance also with high concentrations of essential oil (500-1000 ppm). The experimental investigations in lab-scale aerated tanks under controlled conditions indicated the possibility of decreasing energy requirements (down to 0.16 kWh kgCOD –1) by reducing aeration power (down to 0.6 W m–3) and limiting aeration time to night 12 hours only, when energy price is lower. In spite of the low aeration, the COD removal rates were on the average six-fold higher compared to the anaerobic tank. Other outcomes indicated an ability of the spontaneous microflora to adapt to high concentrations of essential oils, which however did not provide an increase of the removal rate of the organic load in the experimented scheme.

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Traitement des effluents d’huileries par un procédé combinant un traitement intensif (Jet‐Loop Reactor) suivi d’un traitement extensif (bassins de stabilisation)

Cited by 11 publications

References 40 publications

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Intensification of multiphase systems with a jet‐loop reactor: characterization of mass transfer, mixing time, drop oil size, and biomass growth

Aerated lagooning of agro-industrial wastewater: depuration performance and energy requirements

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