Influence of MBBR carriers’ geometry on its flow characteristics

Kruszelnicka, Izabela; Ginter-Kramarczyk, Dobrochna; Poszwa, Przemysław; Stręk, Tomasz

doi:10.1016/j.cep.2018.06.009

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…As the biofilm occupies more and more volume in the biocarrier over time, the free flow cross-section decreases. This reduces the velocity of the flow in the biocarrier [41], which may account in part for the increase in roughness.…”

Section: Discussionmentioning

confidence: 99%

Insights into the Development of Phototrophic Biofilms in a Bioreactor by a Combination of X-ray Microtomography and Optical Coherence Tomography

et al. 2021

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As productive biofilms are increasingly gaining interest in research, the quantitative monitoring of biofilm formation on- or offline for the process remains a challenge. Optical coherence tomography (OCT) is a fast and often used method for scanning biofilms, but it has difficulty scanning through more dense optical materials. X-ray microtomography (μCT) can measure biofilms in most geometries but is very time-consuming. By combining both methods for the first time, the weaknesses of both methods could be compensated. The phototrophic cyanobacterium Tolypothrix distorta was cultured in a moving bed photobioreactor inside a biocarrier with a semi-enclosed geometry. An automated workflow was developed to process µCT scans of the biocarriers. This allowed quantification of biomass volume and biofilm-coverage on the biocarrier, both globally and spatially resolved. At the beginning of the cultivation, a growth limitation was detected in the outer region of the carrier, presumably due to shear stress. In the later phase, light limitations could be found inside the biocarrier. µCT data and biofilm thicknesses measured by OCT displayed good correlation. The latter could therefore be used to rapidly measure the biofilm formation in a process. The methods presented here can help gain a deeper understanding of biofilms inside a process and detect any limitations.

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Section: Discussionmentioning

confidence: 99%

Insights into the Development of Phototrophic Biofilms in a Bioreactor by a Combination of X-ray Microtomography and Optical Coherence Tomography

et al. 2021

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“…Scientists have proposed various methods of treatment using immobilized microflora [4,8,19]. Scientists have also developed various versions of floating-load filters [20] both for the needs of water treatment and for various stages of wastewater treatment [21].…”

Section: Introductionmentioning

confidence: 99%

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

Makisha

2021

Hydrology

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The research revealed in the paper considers the improvement of secondary treatment of wastewater in the aerobic reactor to provide removal of organics and nutrients. There were five types of polymer biofilm carriers taken into account initially; however, two of them were decided not to apply due to technological reasons. The main part of the research was divided into three substages to investigate each type of biofilm carrier. According to the literature review, the optimal efficiency may be reached if the carrier filling ratio is 10 to 30% of reactor volume. On this basis, there were three benches launched at each sub-stage with a corresponding filling ratio of 10, 20, and 30%. The fourth reactor at each sub-stage had no floating carrier to control the experiment. The research of all three types of carriers showed the effect of BOD removal in the range of 95–96% for benches equipped with a floating carrier, which can be considered similar to the control bench with the efficiency of 92%. In the case of ammonia nitrogen, the removal control bench showed only 55% of efficiency, while floating carriers helped to increase the efficiency up to 70–86%. Despite obtaining relatively positive results, the research has to be continued to achieve regulation requirements in treatment quality.

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“…An important example is provided by the geometry of biofilm carriers [1,79]. A team of scientists [1] using an airlift reactor (ALR) with screw screen plates (HSP) in the vertical section intensified the gas-liquid mass transfer process.…”

Section: Influence Of Moving Bed On System Aerationmentioning

confidence: 99%

“…The benefits of using a biofilm (on moving bed) in wastewater technology may be enhanced by improving the parameters of the most important system components. In this case, the researchers decided to optimize the structure of the carrier that affects the strength of the mold, microbial growth, and effectiveness of the treatment, taking into account the predicted conditions under which the carriers will be used [79]. Mathematical modeling was used to facilitate the selection of the optimal geometry of the carrier, so that it had sufficient capacity to carry mass and transport oxygen.…”

Section: Influence Of Moving Bed On System Aerationmentioning

confidence: 99%

The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

Kujawiak

Makowska

Mazurkiewicz

2020

Water

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Barbotage reactors such as airlift reactors (ALR) and bubble column reactors (BCR), due to their two-phase flow systems, were investigated in many research papers. In their basic design variants, they are typically used to lift, mix, and aerate liquids, while, when equipped with additional elements in hybrid variants, their individual properties, i.e., lifting, mixing, and aeration of liquids, can significantly change with the same reactor geometry. The object of this study was to develop a hybrid barbotage reactor in various structural design variants. The structure consisted of a barbotage column of 50 mm in diameter, used to transport a water–air mixture outside the reactor (so-called external loop). The installation was additionally equipped with a nozzle in order to improve mixture aeration and circulation efficiency. The nozzle was mounted at various heights of the column pump segment. Additionally, the reactor was equipped with s moving bed in two variants (20% and 40% reactor capacity) in order to determine its effect on the mixture aeration and circulation conditions. Based on the measurement results, aeration curves were prepared for various structural design and column packing variants of the reactor. Properties of the two-phase mixture were determined for both parts—ALR and BCR. Technological and energy parameters of the aeration process were calculated, and the results obtained for the individual structural design variants were compared. It was found that, for the most advantageous design, in terms of aeration efficiency, the aeration nozzle should be placed in the mid-length of the pump segment of the barbotage column, irrespective of the hybrid reactor packing rate with the moving bed. The reactor packing with the moving bed resulted in a decreased mean water velocity in the reactor. For most analyzed structural design variants, the respective packing with the moving bed had no significant effect on aeration efficiency. Only for one structural design variant did the lack of packing significantly improve oxygen levels by as much as approximately 41%.

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Influence of MBBR carriers’ geometry on its flow characteristics

Cited by 10 publications

References 12 publications

Insights into the Development of Phototrophic Biofilms in a Bioreactor by a Combination of X-ray Microtomography and Optical Coherence Tomography

Insights into the Development of Phototrophic Biofilms in a Bioreactor by a Combination of X-ray Microtomography and Optical Coherence Tomography

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

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