Harvesting economics and strategies using centrifugation for cost effective separation of microalgae cells for biodiesel applications

Dassey, Adam J.; Theegala, Chandra S.

doi:10.1016/j.biortech.2012.10.061

Cited by 231 publications

(68 citation statements)

References 11 publications

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“…However, cost-effective microalgal harvesting may not coincide with the maximum capture efficiency [20]. To achieve high harvesting efficiencies, longer retention times in the bowl are needed to enable their sedimentation, due to the small size of these cells.…”

Section: Centrifugationmentioning

confidence: 99%

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Harvesting techniques applied to microalgae: A review

Barros

Gonçalves

Simões

et al. 2015

Renewable and Sustainable Energy Reviews

785

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: Centrifugationmentioning

confidence: 99%

“…To achieve high harvesting efficiencies, longer retention times in the bowl are needed to enable their sedimentation, due to the small size of these cells. (Table 7) [20]. If coagulation/flocculation is applied prior to centrifugation, its high energy consumption might be lowered, as it reduces the volume to be processed in 65%.…”

Section: Centrifugationmentioning

confidence: 99%

Harvesting techniques applied to microalgae: A review

Barros

Gonçalves

Simões

et al. 2015

Renewable and Sustainable Energy Reviews

785

305

View full text Add to dashboard Cite

show abstract

“…따라서 미세조류의 수확율 을 높이기 위해서는 미세조류의 농도를 증가시키거나, 특별 한 수확공정의 기술 개발이 필수적이다. 현재까지 미세조류 는 원심분리 (Show and Lee, 2014), 여과 (Dassey and Theegala, 2013) 또는 응집 (Liu et al, 2013) …”

Section: 이오 디젤을 만들 수 있는 유망한 소스로 간주되고 있다unclassified

A Comparative Study on Microalgae Recovery Rates in Response to Different Low Cost Bio-flocculant Applications

Choi¹

2015

Journal of Korean Society on Water Environment

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In this study, low cost bio-flocculants, chitosan, cationic starch and Mg-sericite, were used as a flocculant to harvest freshwater microalgae, Chlorella vulgaris. Chitosan, cationic starch and Mg-sericite separated successfully >98% of C. vulgaris at following optimal parameters: 90 mg/L chitosan at pH 6-7, 70 mg/L cationic starch at pH 9-10 and 50 mg/L Mg-sericite at pH 4-5. A relatively high correlation coefficient (R 2 ) of 0.9993 for chitosan, 0.9971 for catonic starch and 0.9924 for Mg-sericite was obtained. The investigated flocculants amount increased linearly with increasing the microalgae amount. The biopolymer, Mg-sericite, was more effective than that of other investigated flocculants. These results indicated that a bio-flocculants, chitosan, cationic starch and Mg-sericite, could prove to be an effective flocculant for economical production of microalgae biomass. In addition, Mg-sericite was more effective comparing to the other investigated flocculants.

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“…16 Centrifugation, the most commonly used method for harvesting microalgae, uses the centrifugal force for the sedimentation of microscopic contaminants such as dust particles, bacteria, and unwanted microalgal cells, but it is a batch process and involves high capital and operational costs for large-scale microalgal culture systems. 14,17 In this study, we propose and experimentally demonstrate an on-chip acoustofluidic platform for harvesting a target microalgal species from a mixed population of microalgae and various kinds of particles as contaminants in a rapid, non-invasive, energy-efficient, continuously running, and automated manner. Acoustofluidics is a method that combines microfluidics and acoustophoresis-a technique for label-free manipulation of particles and cells with acoustic forces whose strength differs, depending on their morphological and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…10, 034119-1 cost comes from the harvesting process, the high cost of the conventional harvesting methods is currently a factor that limits the commercial use of microalgae for biofuel. 13,14 Specifically, filtration is used to remove macroscopic contaminants such as insects, grains of sand, and pieces of plant leaves from environmental samples and cultivated microalgae in the open, 1 but involves large filtration systems and high operation costs to avoid clogging. 15 Chemical flocculation is a method for forming aggregates to separate contaminants, but is not suitable for handling large sample volumes due to its slow process as well as the high cost of flocculants.…”

Section: Introductionmentioning

confidence: 99%

Acoustofluidic harvesting of microalgae on a single chip

et al. 2016

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We present an on-chip acoustofluidic platform for harvesting a target microalgal species from a heterogeneous population of cells and particles based on their size, density, and compressibility in a rapid, non-invasive, energy-efficient, continuously running, and automated manner. For our proof-of-principle demonstration, we use Euglena gracilis as a target species. Specifically, we show the simultaneous separation and enrichment of E. gracilis from a mixed population of E. gracilis in pond water (consisting of other microalgae and various kinds of particles as contaminants) on a single acoustofluidic chip with a recovery ratio of 92.6%, a target separation ratio of 90.1%, a concentration factor of 3.43, an enrichment factor of 12.76, and a cell viability rate of 98.3% at a high volume rate of 500 ll/min. Our results indicate that the on-chip acoustofluidic platform is an effective tool for harvesting target microalgae from mixed populations of microalgae and other contaminants. Published by AIP Publishing. [http://dx

show abstract

Harvesting economics and strategies using centrifugation for cost effective separation of microalgae cells for biodiesel applications

Cited by 231 publications

References 11 publications

Harvesting techniques applied to microalgae: A review

Harvesting techniques applied to microalgae: A review

A Comparative Study on Microalgae Recovery Rates in Response to Different Low Cost Bio-flocculant Applications

Acoustofluidic harvesting of microalgae on a single chip

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