A novel airlift photobioreactor with baffles for improved light utilization through the flashing light effect

Degen, Jörg; Uebele, Andrea; Retze, Axel; Schmid‐Staiger, Ulrike; Trösch, Walter

doi:10.1016/s0168-1656(01)00350-9

Cited by 255 publications

(114 citation statements)

References 13 publications

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“…Such specifications are missing in many other publications. An already patented and described reactor type [37] attempts to the increase of the longitudinal mass transfer and mixing in normal direction to the plate using a purely pneumatic energy regime, Fig. 7.…”

Section: Commonly Employed Reactor Designsmentioning

confidence: 99%

Design principles of photo‐bioreactors for cultivation of microalgae

Posten

2009

Engineering in Life Sciences

682

361

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The present hype in microalgae biotechnology has shown that the topic of photobioreactors has to be revisited with respect to availability in really large scale measured in hectars footprint area, minimization of cost, auxiliary energy demand as well as maintenance and life span. This review gives an overview about present designs and the basic limiting factors which include light distribution to avoid saturation kinetics, mixing along the light gradient to make use of light/ dark cycles, aeration and mass transfer along the vertical or horizontal main axis for carbon dioxide supply and oxygen removal and last but not least the energy demand necessary to fulfil these tasks. To make comparison of the performance of different designs easier, a commented list of performance parameters is given. Based on these critical points recent developments in the areas of membranes for gas transfer and optical structures for light transfer are discussed. The fundamental starting point for the optimization of photo-bioprocesses is a detailed understanding of the interaction between the bioreactor in terms of mass and light transfer as well as the microalgae physiology in terms of light and carbon uptake kinetics and dynamics.

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Section: Commonly Employed Reactor Designsmentioning

confidence: 99%

Design principles of photo‐bioreactors for cultivation of microalgae

Posten

2009

Engineering in Life Sciences

682

361

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“…Laboratory-scale photobioreactors are mainly equipped with fluorescent light or other light source distributions, as performed to other types of bioreactor, for example, bubble column [59,60], airlift column [61], stirred tank [62], helical tubular [63], conical [64], and torus [65].…”

Section: Promising Photobioreactor As a Closed Cultivation Systemmentioning

confidence: 99%

Biotechnology Carbon Capture and Storage by Microalgae to Enhance CO2 Removal Efficiency in Closed-System Photobioreactor

Rinanti¹

2016

Algae - Organisms for Imminent Biotechnology

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The global warming issue caused mainly by carbon dioxide (CO 2 ) has triggered various efforts to reduce excess amount of CO 2 emitted into the atmosphere. A viable option is to utilize biomass production potential of microalgal consortium in aquatic ecosystem that constantly requires CO 2 to perform photosynthesis. This study aims to provide scientific contributions to the development of environmental studies, particularly of using microalgal consortiums as carbon capture and storage (CCS) agent by engineering their culture conditions. A number of studies analyzing biological reduction of atmospheric CO 2 by using CO 2 absorption capability of terrestrial plants have been facing many difficulties. Compared to various terrestrial plants, microalgae are generally considered photosynthetically more efficient. Exploitation of microalgal capability has numerous advantages, including their faster regeneration time, ability to grow in less space than terrestrial plants, and because the cultivation of microalgae can be done on a small-scale or large-scale operation, under controlled conditions, and is independent to climatic changes. Taking into account long-term advantages, this study is a preliminary study which is expected to be able to provide information and feedback regarding integrated microalgal culture system that may lead to alternative solutions of ecofriendly and sustainable environmental management technology that are capable of mitigating environmental problems caused by CO 2 (as greenhouse gas) emissions. Hence, the results of this research could be implemented by building urban microalgal ponds in efforts to develop sustainable cities in terms of CO 2 emission reduction in urban areas.

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“…Production has been shown to vary with high-light conditions. Increased mixing of increasingly concentrated cultures also enhances production [158,163,236], presumably by increasing the exposure time of the cells to the light regime. Previous to this, Laws et al [48] increased production in a raceway pond using turbulent eddy shedding to create highfrequency fluid motions, thereby exposing cells to high-light fluctuations.…”

Section: Growth Rate Biomass and Productionmentioning

confidence: 99%

Dependency of Microalgal Production on Biomass and the Relationship to Yield and Bioreactor Scale-up for Biofuels: a Statistical Analysis of 60+ Years of Algal Bioreactor Data

Granata

2016

Bioenerg. Res.

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Since the 1950s, research has been undertaken to promote algal oil as a sustainable alternative to fossil fuels. This paper statistically analyzed 317 studies of algal bioreactors to determine the interdependence of biological and physical factors affecting oil yield. Algal growth rates in bioreactors often (71 %) exceeded maximal growth rates cited in the literature, and biomass was generally higher than maximum values cited for laboratory cultures. Growth rate decreased with increasing biomass, and biomass, not growth, dominated production rate, which was higher in closed than in open bioreactors. Except for Chlorella cultured in horizontal tubular reactors, there were no statistical differences in algal production when grown in different types of reactors. Production decreased with increasing bioreactor volume, but increased with surface to volume ratio of the bioreactor. In contrast, estimated oil yields increased with bioreactor volume. Four groups of bioreactors were identified based on their oil yields and biomass production: (1) higher yields with lower production were limited to open systems with volumes ≥10 4 L; (2) higher yields with higher production were almost exclusively closed bioreactors from 10 2 to 10 3 L; (3) lower yields with higher production were closed systems from 3 to 99 L; and (4) lower yields with lower production were a mix of open and closed systems with diverse volumes. Based on these groups, it is suggested that intermediate volume bioreactors with higher surface to volume ratios could give higher yields and production rates and would avoid the environmental and scale-up problems inherent in large bioreactors currently being used commercially to culture microalgae.

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A novel airlift photobioreactor with baffles for improved light utilization through the flashing light effect

Cited by 255 publications

References 13 publications

Design principles of photo‐bioreactors for cultivation of microalgae

Design principles of photo‐bioreactors for cultivation of microalgae

Biotechnology Carbon Capture and Storage by Microalgae to Enhance CO2 Removal Efficiency in Closed-System Photobioreactor

Dependency of Microalgal Production on Biomass and the Relationship to Yield and Bioreactor Scale-up for Biofuels: a Statistical Analysis of 60+ Years of Algal Bioreactor Data

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