Microalgae harvesting and subsequent biodiesel conversion

Tran, Dang Thuan; Le, Bich Hanh; Lee, Dong Hoon; Chen, Ching Lung; Wang, Hsiang Yu; Chang, Jo‐Shu

doi:10.1016/j.biortech.2013.04.084

Cited by 50 publications

(19 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compared with centrifugation, chemical flocculation requires less energy 10 . However, the method presents several important drawbacks, such as end-product contamination with metal salts, high costs for flocculant acquisition (especially at an industrial scale), as well as the sensitivity of the procedure for the following factors: pH, the morphology of the microalgal cells, the stage of the microalgae life cycle, and flocculant type 17, 18 . Gravity sedimentation is applied for activated sludge recovery, being the most cost-suitable harvesting method.…”

Section: Introductionmentioning

confidence: 99%

Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

Tiron

Bumbac

Manea

et al. 2017

Sci Rep

102

View full text Add to dashboard Cite

The economic factor of the microalgae harvesting step acts as a barrier to scaling up microalgae-based technology designed for wastewater treatment. In view of that, this study presents an alternative microalgae-bacteria system, which is proposed for eliminating the economic obstacle. Instead of the microalgae-bacteria (activated algae) flocs, the study aimed to develop activated algae granules comprising the microalgae Chlorella sp. as a target species. The presence of the filamentous microalgae (Phormidium sp.) was necessary for the occurrence of the granulation processes. A progressive decrease in frequency of the free Chlorella sp. cells was achieved once with the development of the activated algae granules as a result of the target microalgae being captured in the dense and tangled network of filaments. The mature activated algae granules ranged between 600 and 2,000 µm, and were characterized by a compact structure and significant settling ability (21.6 ± 0.9 m/h). In relation to the main aim of this study, a microalgae recovery efficiency of higher than 99% was achieved only by fast sedimentation of the granules; this performance highlighted the viability of the granular activated algae system for sustaining a microalgae harvesting procedure with neither cost nor energy inputs.

show abstract

Section: Introductionmentioning

confidence: 99%

Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

Tiron

Bumbac

Manea

et al. 2017

Sci Rep

102

View full text Add to dashboard Cite

show abstract

“…Chlorella vulgaris ESP-31 containing 22.7% lipid was used as the oil source for biodiesel production via transesterification catalyzed by SrO/SiO 2 . The solid catalyst SrO/SiO 2 worked well with water-removed, centrifuged Chlorella vulgaris ESP-31 and a biodiesel conversion of 80% (Tran et al, 2013).…”

Section: ) Transesterificationmentioning

confidence: 99%

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

Klinthong

Yang

Huang

et al. 2015

Aerosol Air Qual. Res.

211

View full text Add to dashboard Cite

Fossil fuels, which are recognized as unsustainable sources of energy, are continuously consumed and decreased with increasing fuel demands. Microalgae have great potential as renewable fuel sources because they possess rapid growth rate and the ability to store high-quality lipids and carbohydrates inside their cells for biofuel production. Microalgae can be cultivated on opened or closed systems and require nutrients and CO 2 that may be supplied from wastewater and fossil fuel combustion. In addition, CO 2 capture via photosynthesis to directly fix carbon into microalgae has also attracted the attention of researchers. The conversion of CO 2 into chemical and fuel (energy) products without pollution via this approach is a promising way to not only reduce CO 2 emissions but also generate more economic value. The harvested microalgal biomass can be converted into biofuel products, such as biohydrogen, biodiesel, biomethanol, bioethanol, biobutanol and biohydrocarbons. Thus, microalgal cultivation can contribute to CO 2 fixation and can be a source of biofuels. This article reviews the literature on microalgae that were cultivated using captured CO 2 , technologies related to the production of biofuels from microalgae and the possible commercialization of microalgae-based biofuels to demonstrate the potential of microalgae. In this respect, a number of relevant topics are addressed: the nature of microalgae (e.g., species and composition); CO 2 capture via microalgae; the techniques for microalgal cultivation, harvesting and pretreatment; and the techniques for lipid extraction and biofuel production. The strategies for biofuel commercialization are proposed as well.

show abstract

“…The lipids in extract were converted to fatty acid methyl esters (FAMEs), which were purified by gas chromatography [23]. The fatty acids C15-C18 were counted as the part useful for biofuel production.…”

Section: Chemical Analysismentioning

confidence: 99%