Ratio between autoflocculating and target microalgae affects the energy-efficient harvesting by bio-flocculation

Salim, S.; Vermuë, M.H.; Wijffels, René H.

doi:10.1016/j.biortech.2012.05.007

Cited by 145 publications

(52 citation statements)

References 16 publications

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“…Recovery efficiencies, as well as the time needed for microalgal sedimentation, are in the same range as the ones observed for chemically induced flocculation (Tables 2 and 5). Considering a raceway pond cultivation system of 100 ha and a disk stack bowl centrifuge, the application of this pre-concentrating method, with a ratio between flocculating and non-flocculating microalgae of 0.25, generates an energy saving per biomass dry weight of approximately 12 MJ kg dry weight -1 [50].…”

Section: Auto and Bioflocculationmentioning

confidence: 99%

Harvesting techniques applied to microalgae: A review

Barros

Gonçalves

Simões

et al. 2015

Renewable and Sustainable Energy Reviews

781

305

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Research studies on microalgae have increased in the last decades due to the wide range of applications associated to these photosynthetic microorganisms. Microalgae are an important source of oils and other biomolecules that can be used in the production of biofuels and high-valued products. However, the use of microalgae in these green processes is still not economically viable. One of the main costs associated to microalgal production is related to the harvesting process, as it usually accounts for about 20-30% of total cost. Therefore, this review focuses on the main harvesting processes applied to microalgae, presenting the main advantages and disadvantages of each method, to allow the selection of an appropriate procedure to effectively separate microalgal biomass from the culture medium. To reduce the associated costs, it is common to harvest microalgae in a two-step separation: (i) thickening procedures, in which microalgal slurry is concentrated to about 2-7% of total suspended solids; and (ii) dewatering procedures, which result in the concentration of microalgal slurry to 15-25% of total suspended solids. Selection of the adequate harvesting methods depends on the characteristics of the target microorganism and also on the type and value of the end product.

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Section: Auto and Bioflocculationmentioning

confidence: 99%

Harvesting techniques applied to microalgae: A review

Barros

Gonçalves

Simões

et al. 2015

Renewable and Sustainable Energy Reviews

781

305

View full text Add to dashboard Cite

show abstract

“…ultrasound, flotation, centrifugation and filtration, which have also been successfully applied to a range of microalgal species, have a higher input cost. [2,30] Also, the viability at small scale may restrict them from large-scale harvesting systems. [11,29] Eggshells as a flocculant could also be considered superior to inorganic flocculants (iron and/or aluminium based), which may hinder further use of the algae biomass in food and feed applications due to toxicity or in fuel production owing to the need for their removal before further processing.…”

Section: Effect Of Mixing Ratementioning

confidence: 99%

Effect of eggshells for the harvesting of microalgae species

Choi

2015

Biotechnology & Biotechnological Equipment

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The aim of this study was to determine the optimal conditions for adding eggshells as a bioflocculant (including concentration dosage, pH, mixing time, mixing rate and settling time) in harvesting Chlorella vulgaris cells from liquid cultures, using the well-known jar-test experimental method. Eggshells separated successfully 99 § 0.4% of the C. vulgaris biomass at the following optimal parameters: eggshell concentration 80 mg/L, mixing time 20 min, mixing rate 150 r/min and settling time 20 min at pH 6. These results indicated that eggshells, as a biopolymer, are a promising flocculant due to their high separation efficiency, low dose requirements and short mixing and settling time. Eggshells not only act as an adsorbent, but also spontaneously coagulate to agglomerate the microalgae cells.

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“…High flocculation efficiencies are also observed when filamentous cyanobacteria are prominent in the microalgal community (Su et al 2011). Spontaneously flocculating microalgae can also be used to harvest other, non-flocculating species of microalgae by mixing bioflocculating and nonflocculating microalgae (Salim et al 2011(Salim et al , 2012. Some bioflocculating species of microalgae such as the diatom Skeletonema appear to produce infochemicals that are capable of inducing flocculation in other microalgal species (Taylor et al 2012).…”

Section: Bioflocculationmentioning

confidence: 96%

Harvesting of Microalgae by Means of Flocculation

Muylaert

Vandamme

Foubert

et al. 2015

Biofuel and Biorefinery Technologies

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Large-scale production of microalgae for biofuels is still facing several major challenges to become competitive with other forms of renewable and nonrenewable energy. A major challenge is harvesting, which requires the separation of a low amount of biomass consisting of small individual cells from a large volume of culture medium. Flocculation is seen as a promising low-cost harvesting method for microalgae biomass. In this chapter, the challenges and potential advantages of using flocculation as a harvesting method for microalgae are reviewed.

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Ratio between autoflocculating and target microalgae affects the energy-efficient harvesting by bio-flocculation

Cited by 145 publications

References 16 publications

Harvesting techniques applied to microalgae: A review

Harvesting techniques applied to microalgae: A review

Effect of eggshells for the harvesting of microalgae species

Harvesting of Microalgae by Means of Flocculation

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