A critical evaluation of CO2 supplementation to algal systems by direct injection

Langley, N.; Harrison, Susan T.L.; Hille, Robert P. van

doi:10.1016/j.bej.2012.07.013

Cited by 73 publications

(32 citation statements)

References 22 publications

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“…Although bacterial contamination and CO2 escape is not a problem in a photobioreactor, the operation and sterilization of numerous photobioreactors are laborious, time-consuming, and costly (Kumar, 2015). Several researchers have also reported that CO2 gas-liquid mass transfer rates are still a factor inhibiting the growth of autotrophic microalgae in a photobioreactor (Fan, 2008;Langley, 2012;Pirouzi, 2014). Fan et al (Fan, 2008) constructed a membrane sparged helical tubular photobioreactor in order to overcome the CO2 mass transfer limitations during C. vulgaris cultivation.…”

Section: Introductionmentioning

confidence: 99%

Effect of moderate static electric field on the growth and metabolism of Chlorella vulgaris

Nezammahalleh

Ghanati

Adams

et al. 2016

Bioresource Technology

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This post-print has been archived on the author's personal website (macc.mcmaster.ca) and/or the author's institutional repository (macsphere.mcmaster.ca) Abstract An electric field (EF) generator device was fabricated and applied to the treatment of Chlorella vulgaris ISC33 at three distinct concentrations before cultivation. The EF of moderate intensity (2.7 kVcm -1 ) has a hormetic effect on algal growth. The highest growth stimulation of 51% was observed after 50 min treatment of 0.4 g L -1 algal suspension. The influence of EF on the system was then studied from both theoretical and experimental perspectives. The growth rate increased with treatment time up to a maximum because of improved membrane permeability, and then declined afterwards due to peroxide accumulation in the medium. The contents of chlorophylls, carotenoids, soluble carbohydrates, lipids, and proteins were also measured to understand possible changes on algal metabolism. The EF treatment of algal suspension has no observable effect on the cell metabolism while both algal growth and metabolism was significantly affected by the inoculum size.

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Section: Introductionmentioning

confidence: 99%

Effect of moderate static electric field on the growth and metabolism of Chlorella vulgaris

Nezammahalleh

Ghanati

Adams

et al. 2016

Bioresource Technology

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“…In contrast, consider that Langley et al . reported that the carbon capture rate was only 2.1% when feeding carbon dioxide at mole fractions of 1.45% to a Chlorella vulgaris culture in an internal loop air lift reactor. Therefore, the prospect that a TVAR could be used to simultaneously capture waste stream carbon dioxide and produce useful products motivates further investigation and development of Taylor vortex algal photobioreactors.…”

Section: Resultsmentioning

confidence: 99%

“…The observation that high carbon dioxide capture rates (70%) can be sustained over long periods of time in a continuous flow TVAR using a high CO 2 mole fraction (10%) is also significant since this concentration is typical of those found in fossil fuel power plant flue gases [15]. In contrast, consider that Langley et al [16] reported that the carbon capture rate was only 2.1% when feeding carbon dioxide at mole fractions of 1.45% to a Chlorella vulgaris culture in an internal loop air lift reactor. Therefore, the prospect that a TVAR could be used to simultaneously capture waste stream carbon dioxide and produce useful products motivates further investigation and development of Taylor vortex algal photobioreactors.…”

Section: Resultsmentioning

confidence: 99%

Light‐limited continuous culture of Chlorella vulgaris in a Taylor vortex reactor

Kong

Vigil

2013

Env Prog and Sustain Energy

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Recently, it has been demonstrated that Taylor vortices—hydrodynamic structures that arise in the annular region between two concentric cylinders when the inner cylinder rotates—can substantially improve the growth rate of algal biomass in a batch photobioreactor by inducing the flashing light effect. In order to assess the potential for using Taylor vortex flow to continuously culture algae, experiments were carried out in a continuous flow Taylor vortex algal photobioreactor using Chlorella vulgaris. Specifically, two important operating parameters were varied: the dilution rate and the inner cylinder rotation speed. For a fixed inner cylinder rotation speed, biomass productivity was independent of dilution rate. In contrast, biomass productivity was found to increase with increasing inner cylinder rotation speed for a fixed dilution rate, but this effect became less pronounced at higher rotation speeds. Overall, it is demonstrated that a continuous flow Taylor vortex algal photobioreactor can be used to produce and sustain high biomass production and carbon dioxide capture rates when operated in continuous flow mode. © 2013 American Institute of Chemical Engineers Environ Prog, 32: 884–890, 2013

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“…In particular, the observation that high algal growth rates can be obtained in a TVAR at high CO 2 mole fractions (10%) is significant, as these concentrations approach those typically found in fossil fuel flue gas streams (12-15%), and the possibility of simultaneously capturing carbon and producing useful products from these waste streams by feeding them to algal PBRs is highly attractive (Packer, 2009). Based upon studies of the effects of CO 2 feed gas mole fraction on algal productivity in airlift reactors, however, some have questioned the efficacy of direct injection of flue gases into algal reactors (Langley et al, 2012), but the results presented here are more encouraging. Lastly, we note that in addition to potential commercial applications Taylor vortex algal reactors hold near-term promise as laboratory-scale reactors capable of significantly reducing the time required to develop high concentration cultures that otherwise grow slowly in shake flask, airlift, or bubble column reactors.…”

Section: Discussionmentioning

confidence: 99%

Enhanced algal growth rate in a Taylor vortex reactor

Kong

Shanks

Vigil

2013

Biotech & Bioengineering

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The rate of production of algal biomass in optically dense photobioreactors depends crucially on the temporal light exposure of microorganisms, which in turn is determined by fluid flow patterns and the quantity and spatial distribution of photosynthetically active radiation. In this report it is demonstrated that highly organized and robust toroidal flow structures known as Taylor vortices cause significant increases in the rate of biomass production, efficiency of light utilization, and CO2 uptake, and these effects become more pronounced at higher Reynolds numbers. In light of these findings and previously reported experiments using Taylor vortex flow to culture algae, it is argued that the flashing light effect, rather than mass transport effects, is responsible for the observed increases in the rate of photosynthesis.

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A critical evaluation of CO2 supplementation to algal systems by direct injection

Cited by 73 publications

References 22 publications

Effect of moderate static electric field on the growth and metabolism of Chlorella vulgaris

Effect of moderate static electric field on the growth and metabolism of Chlorella vulgaris

Light‐limited continuous culture of Chlorella vulgaris in a Taylor vortex reactor

Enhanced algal growth rate in a Taylor vortex reactor

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