Life cycle analyses of CO2, energy, and cost for four different routes of microalgal bioenergy conversion

Ventura, Jey-R; Yang, Biao; Lee, Yong-Woo; Lee, Kisay; Jahng, Deokjin

doi:10.1016/j.biortech.2013.02.104

Cited by 67 publications

(46 citation statements)

References 21 publications

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“…A recent study that analysed four methods of microalgal bioenergy production found that anaerobic digestion produces more net energy than supercritical gasification, the latter requiring higher energy input and having a negative return on energy investment [122,169]. This conclusion is supported by a related study that has demonstrated that anaerobic digestion of "algal residues" can have a higher net energy return and much lower GHG emissions than gasification [170].…”

Section: Anaerobic Digestionmentioning

confidence: 93%

Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

Milledge

Harvey

2016

JMSE

166

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Abstract:In recent years there have been massive inundations of pelagic Sargassum, known as golden tides, on the beaches of the Caribbean, Gulf of Mexico, and West Africa, causing considerable damage to the local economy and environment. Commercial exploration of this biomass for food, fuel, and pharmaceutical products could fund clean-up and offset the economic impact of these golden tides. This paper reviews the potential uses and obstacles for exploitation of pelagic Sargassum. Although Sargassum has considerable potential as a source of biochemicals, feed, food, fertiliser, and fuel, variable and undefined composition together with the possible presence of marine pollutants may make golden tides unsuitable for food, nutraceuticals, and pharmaceuticals and limit their use in feed and fertilisers. Discontinuous and unreliable supply of Sargassum also presents considerable challenges. Low-cost methods of preservation such as solar drying and ensiling may address the problem of discontinuity. The use of processes that can handle a variety of biological and waste feedstocks in addition to Sargassum is a solution to unreliable supply, and anaerobic digestion for the production of biogas is one such process. More research is needed to characterise golden tides and identify and develop commercial products and processes.

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Section: Anaerobic Digestionmentioning

confidence: 93%

Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

Milledge

Harvey

2016

JMSE

166

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“…Both gasification and anaerobic digestion have been suggested as promising methods for exploiting bioenergy from biomass in India [97]. A recent study analysed four methods of microalgal bioenergy production and concluded that supercritical gasification produced more net energy than that from anaerobic digestion [98]. However, following subsequent correction of errors in these calculations (acknowledged by the author in a private communication in 2014), it can be estimated that anaerobic digestion produces more net energy than supercritical gasification, the latter requiring higher energy input and hence giving a negative return on energy investment.…”

Section: Gasificationmentioning

confidence: 99%

Macroalgae-Derived Biofuel: A Review of Methods of Energy Extraction from Seaweed Biomass

et al. 2014

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Abstract:The potential of algal biomass as a source of liquid and gaseous biofuels is a highly topical theme, but as yet there is no successful economically viable commercial system producing biofuel. However, the majority of the research has focused on producing fuels from microalgae rather than from macroalgae. This article briefly reviews the methods by which useful energy may be extracted from macroalgae biomass including: direct combustion, pyrolysis, gasification, trans-esterification to biodiesel, hydrothermal liquefaction, fermentation to bioethanol, fermentation to biobutanol and anaerobic digestion, and explores technical and engineering difficulties that remain to be resolved.

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“…These chemical conversion processes require a high temperature (60-80°C) in the presence of alcohols (Li et al, 2011), which are high in cost and energy consumption. It has been estimated that for algal biodiesel production, about 15% of energy is used for oil conversion into FAMEs (Ventura et al, 2013). Moreover, toxic waste solvents and alkaline wastewater will be generated through chemical conversion when using alkali catalysts.…”

Section: Introductionmentioning

confidence: 99%

Highly-efficient enzymatic conversion of crude algal oils into biodiesel

Wang

Liu

Gerken

et al. 2014

Bioresource Technology

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Life cycle analyses of CO2, energy, and cost for four different routes of microalgal bioenergy conversion

Cited by 67 publications

References 21 publications

Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

Golden Tides: Problem or Golden Opportunity? The Valorisation of Sargassum from Beach Inundations

Macroalgae-Derived Biofuel: A Review of Methods of Energy Extraction from Seaweed Biomass

Highly-efficient enzymatic conversion of crude algal oils into biodiesel

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