Aeration and mass transfer optimization in a rectangular airlift loop photobioreactor for the production of microalgae

Guo, Xin; Yao, Lishan; Huang, Qingshan

doi:10.1016/j.biortech.2015.04.077

Cited by 90 publications

(25 citation statements)

References 34 publications

(60 reference statements)

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“…This type of reactors typically consists of a transparent cylindrical container with a sparger at the bottom, which can be divided into bubble column reactors [77,[129][130][131][132][133] and airlift column reactors [134][135][136][137][138]. Gas diffusion takes place from the bottom covering the entire volume of the bubble column reactor to the airlift column reactor which is divided by two interconnecting zones, 'raiser' where gas mixture is sparged and 'down comer' which is gas free.…”

Section: Vertical Columnmentioning

confidence: 99%

Microalgae as a potential source for biodiesel production: techniques, methods, and other challenges

Arenas

Palacio

Juantorena

et al. 2016

Int. J. Energy Res.

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Summary This paper reviews some of the most important aspects of microalgae as a potential source for biodiesel production. Microalgae are photosynthetic microorganisms that can grow rapidly in a variety of environments because of their unicellular or multicellular structure depending on the species. They have the advantage of self‐reproduction using solar energy and converting it into chemical energy via photosynthesis. This process concludes a full cycle in a few days, obtaining higher lipid yields than terrestrial crops. This review shows several techniques and some methodologies used in the biodiesel production process from microalgae as well as the challenges that must be overcome for large‐scale process and in bio‐refineries. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Vertical Columnmentioning

confidence: 99%

Microalgae as a potential source for biodiesel production: techniques, methods, and other challenges

Arenas

Palacio

Juantorena

et al. 2016

Int. J. Energy Res.

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“…Intensive efforts that combine theory and practice are still needed to exploit the full potential of PBR's for large scale cultivation. As pointed out by Guo et al [10], important factors that need to be addressed are light distribution, hydrodynamics, mass transfer and growth kinetics. The present communication deals with the scaling up of the flat panel photobioreactor from 8 L to 250 L and optimization of operational strategy for cost effective mass production of halophilic indigenous microalgal strain Pseudanabaena limnetica (Lemm.…”

Section: Resultsmentioning

confidence: 99%

Operational Strategies for Cost Effective Mass Cultivation of Halophilic Microalgal Strain Pseudanabaena limnetica in 1000 L Flat Panel Photobioreactor

Sampat¹,

Arun²

2018

J Pet Environ Biotechnol

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Worldwide microalgae have been known for their wide industrial applications since many centuries, but large scale cultivation of algae in photo bioreactors is still having many constraints with regards to construction cost, system dimensions, culture sustainability and productivity. Algal feedstock production is impended by failure of translation of laboratory studies to field scale ups. The present research work deals with the construction of the low cost flat panel photobioreactor system and optimization of operational strategies. The microalgal strain selected for mass cultivation is an indigenous halophilic Pseudanabaena limnetica species, which sustains at high temperature and light intensity of summer season and it could be grown in marine water. Therefore, actual seawater has been utilized for cost effective biomass production. Flat panel photobioreactor was scaled up from 8 L to 250 L. Three airlift panels with dimensions of: length × height × breadth as 25 cm × 38 cm × 10 cm (8 L), 50 cm × 70 cm × 20 cm (60 L) and 100 cm × 110 cm × 28 cm (250 L) have been developed. The optimization of air flow rate and sparger pore size was conducted. Physical parameters like, Sparger velocity (ν) m/s along with change in Reynolds number (Re), superficial velocity of gas (Usg), gas holdup (ɛ) were studied for their efficiency to support algal growth. Also optimization of other important parameters like light intensity, inoculum size was carried out in laboratory condition and correlated with the biomass production. After optimization each PBR was operated in outdoor conditions. Electric power consumption, its cost estimation, total biomass productivity and operational feasibility of the developed photobioreactor system were also discussed. After optimization of operational strategy for working of photo bioreactors in laboratory and outdoor conditions, 60 L flat panel photobioreactor was found to be most suitable for large scale cultivation of P. Limnetica. Therefore attempts have been initiated to construct and assemble the 1000 L photobioreactor system.

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“…It has been reported that an optimal superficial gas velocity of 8.333 x10 -4 m s -1 for the cultivation of the Chlorella vulgaris. Economic analysis has estimated that mixing accounts for 53% of the total costs in some types of PBRs, and one critical challenge to algae biofuel generation was its poor energy balance due to high auxiliary energy requirements for the mixing and the mass transfer [50,60].…”

Section: Biomass Production Enhancing: Turbulence and Mixing Effectsmentioning

confidence: 99%

“…A deep knowledge of the fluid dynamics and the mass transfer is needed for the PBR rational design and optimization. It is necessary to understand the interplay among gas holdup, liquid circulation velocity, mixing, and gas-liquid mass transfer [31,60].…”

Section: Gas Exchange Carbon Dioxide and Oxygenmentioning

confidence: 99%

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Considerations for Photobioreactor Design and Operation for Mass Cultivation of Microalgae

Cañedo¹,

Lizárraga²

2016

Algae - Organisms for Imminent Biotechnology

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Microalgae have great biotechnological potential for production of substances through photosynthesis. Light capture process and electron transportation imply energy losses due to reflection, fluorescence emission, and energy dissipation as heat, giving a maximum theoretical value of -% for microalgae energy capture efficiency and conversion to biomass. For development of full potential of microalgae the knowledge of the light capture process is required. High yields can only be obtained linking photobioreactor design with biological process taking place inside. In massive microalgae cultures, light gradients are generated and this depends on the biomass concentration, cellular types, cells sizes, and pigment content, and also on geometry, hydrodynamic, and light conditions inside the photobioreactor. In the present chapter we explain the relationship between light energy capture process and photobioreactor design and operation conditions, like turbulence, gas exchange, and nutrient requirements. Finally, the productivity and costs are discussed, and the parameters that determine the economic viability of any microalgae culture.

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Aeration and mass transfer optimization in a rectangular airlift loop photobioreactor for the production of microalgae

Cited by 90 publications

References 34 publications

Microalgae as a potential source for biodiesel production: techniques, methods, and other challenges

Microalgae as a potential source for biodiesel production: techniques, methods, and other challenges

Operational Strategies for Cost Effective Mass Cultivation of Halophilic Microalgal Strain Pseudanabaena limnetica in 1000 L Flat Panel Photobioreactor

Considerations for Photobioreactor Design and Operation for Mass Cultivation of Microalgae

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