Continuous microalgae recovery using electrolysis: Effect of different electrode pairs and timing of polarity exchange

Kim, Jungmin; Ryu, Byung-Gon; Kim, Kyochan; Kim, Bo‐Kyong; Han, Jong‐In; Yang, Ji‐Won

doi:10.1016/j.biortech.2012.08.010

Cited by 55 publications

(17 citation statements)

References 26 publications

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“…Kim et al [232] categorizes harvesting and dewatering as the most energy intensive steps and advocates for an efficient and improved method for the same to decrease the cost of microalgal oil production. They further devised an economical method using electro-coagulation coupled with flotation and termed it "continuous electrolytic microalgae harvest".…”

Section: Harvesting Dewatering and Extraction Of Lipidsmentioning

confidence: 99%

Towards a sustainable approach for development of biodiesel from plant and microalgae

Singh

Guldhe

Rawat

et al. 2014

Renewable and Sustainable Energy Reviews

260

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Section: Harvesting Dewatering and Extraction Of Lipidsmentioning

confidence: 99%

Towards a sustainable approach for development of biodiesel from plant and microalgae

Singh

Guldhe

Rawat

et al. 2014

Renewable and Sustainable Energy Reviews

260

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“…Examples of harvesting techniques (mainly filtration, centrifugation and flocculation) used to continuously remove microalgal and cyanobacterial cells have been described elsewhere (Christenson and Sims, 2011;Grima et al, 2004;Heasman et al, 2000;Lee et al, 2010;Molina Grima et al, 2003;Rossignol et al, 1999) Alternative methods have also been tested for the continuous harvesting of microalgal and cyanobacterial cells. Kim et al (2012Kim et al ( , 2014 harvested the microalgae Nannochloris oculata and Nannochloropsis oceanica, respectively, using the electrolytic method, without subjecting the cells to any kind of shear stress. Additionally, an ultrasonic continuous harvesting process has been successfully tested by (Bosma et al, 2003), in order to recover Monodus subterraneus cells.…”

Section: Harvestingmentioning

confidence: 99%

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Fernandes

Mota

Teixeira

et al. 2015

Biotechnology Advances

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The possibility of using photosynthetic microorganisms, such as cyanobacteria and microalgae, for converting light and carbon dioxide into valuable biochemical products has raised the need for new cost-efficient processes ensuring a constant product quality. Food, feed, biofuels, cosmetics and pharmaceutics are among the sectors that can profit from the application of photosynthetic microorganisms. Biomass growth in a photobioreactor is a complex process influenced by multiple parameters, such as photosynthetic light capture and attenuation, nutrient uptake, photobioreactor hydrodynamics and gas-liquid mass transfer. In order to optimize productivity while keeping a standard product quality, a permanent control of the main cultivation parameters is necessary, where the continuous cultivation has shown to be the best option. However it is of utmost importance to recognize the singularity of continuous cultivation of cyanobacteria and microalgae due to their dependence on light availability and intensity. In this sense, this review provides comprehensive information on recent breakthroughs and possible future trends regarding technological and process improvements in continuous cultivation systems of microalgae and cyanobacteria, that will directly affect cost-effectiveness and product quality standardization. An overview of the various applications, techniques and equipment (with special emphasis on photobioreactors) in continuous cultivation of microalgae and cyanobacteria are presented. Additionally, mathematical modeling, feasibility, economics as well as the applicability of continuous cultivation into large-scale operation, are discussed.

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“…6 The challenges of microalgae harvesting originate in their low cell concentration (< 2 g/L), small size (on the order of a few micrometers) and stable dispersion. Although application of any of several conventional methods including centrifugation, 6 filtration, 7 and electrolysis [8][9] has been suggested, their energy-intensiveness renders them problematic. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 Flocculation is an alternative, non-conventional, minimal-energy-use technology that has been considered for application to microalgae harvesting.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Nanoflocculant-Assisted Water–Nonpolar Solvent Interface Sieve for Microalgae Harvesting

Lee

Seo

et al. 2015

ACS Appl. Mater. Interfaces

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Exploitation of magnetic flocculants is regarded as a very promising energy-saving approach to microalgae harvesting. However, its practical applicability remains limited, mainly because of the problem of the postharvest separation of magnetic flocculants from microalgal flocs, which is crucial both for magnetic-flocculant recycling and high-purity microalgal biomasses, but which is also a very challenging and energy-consuming step. In the present study, we designed magnetic nanoflocculants dually functionalizable by two different organosilane compounds, (3-aminopropyl)triethoxysilane (APTES) and octyltriethoxysilane (OTES), which flocculate negatively charged microalgae and are readily detachable at the water-nonpolar organic solvent (NOS) interface only by application of an external magnetic field. APTES functionalization imparts a positive zeta potential charge (29.6 mV) to magnetic nanoflocculants, thereby enabling microalgae flocculation with 98.5% harvesting efficiency (with a dosage of 1.6 g of dMNF/g of cells). OTES functionalization imparts lipophilicity to magnetic nanoflocculants to make them compatible with NOS, thus effecting efficient separation of magnetic flocculants passing through the water-NOS interface sieve from hydrophilic microalgae. Our new energy-saving approach to microalgae harvesting concentrates microalgal cultures (∼1.5 g/L) up to 60 g/L, which can be directly connected to the following process of NOS-assisted wet lipid extraction or biodiesel production, and therefore provides, by simplifying multiple downstream processes, a great potential cost reduction in microalgae-based biorefinement.

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Continuous microalgae recovery using electrolysis: Effect of different electrode pairs and timing of polarity exchange

Cited by 55 publications

References 26 publications

Towards a sustainable approach for development of biodiesel from plant and microalgae

Towards a sustainable approach for development of biodiesel from plant and microalgae

Continuous cultivation of photosynthetic microorganisms: Approaches, applications and future trends

Magnetic-Nanoflocculant-Assisted Water–Nonpolar Solvent Interface Sieve for Microalgae Harvesting

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