Rheological properties of algae slurries for minimizing harvesting energy requirements in biofuel production

Wileman, A. E.; Özkan, Aysun; Berberoğlu, Halil

doi:10.1016/j.biortech.2011.11.027

Cited by 106 publications

(69 citation statements)

References 20 publications

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“…Basically, along with the cell disruption proceeding, as cell components degrade, the solid mass concentration reduced and the light scattering of the treated cell suspension decreased, which led to decreased turbidity of cell suspension, and manifested increased cell disruption rate, and its curves aligned well with cell count in this study [14,29].…”

Section: Cell Disruption By Pressure-assisted Ozonationsupporting

confidence: 61%

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

et al. 2016

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This study evaluated the effectiveness of pressure-assisted ozonation (PAO) in Chlorella vulgaris (C. vulgaris) cell disruption, and compared the disruption result with that of the ultrasonication (US) by using four quantification indicators: cell counting, ultra violet (UV) absorbance, turbidity and visible light absorbance. It was found that under the condition of 0.8 MPa and 80 cycles, PAO treatment achieved cell rupture of 80.3%, with the power of 1080 W and treatment time of 60 min, US achieved cell rupture of 83.8%. Cell counting was a reliable indicator and applicable to both PAO and US treatments. Turbidity and visible light absorbance gave similar results and featured as the simplest operation. UV absorbance reflected the metabolite release due to cell breakage; however, it was less reproducible when it was applied to quantify the cell rupture by PAO. Its trend indicated that during cell disruption metabolite degradation occurred, especially after significant rupture in the case of excessive PAO treatment. The cellular morphology of C. vulgaris cells during PAO and US treatments was investigated by scanning electron microscope (SEM) which certified that the cells damage was caused by both physical and chemical attack.

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Section: Cell Disruption By Pressure-assisted Ozonationsupporting

confidence: 61%

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

et al. 2016

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“…The feedstock concentration of 10% was selected as being at the upper end of that typically encountered in Continuously Stirred Tank Reactor (CSTR digesters) [78,79]; microalgal suspensions above 10% also behave as non-Newtonian fluids with a high viscosity and may be problematic to pump [53,80].…”

Section: Microalgal Biogas Production With a Combination Of Harvestinmentioning

confidence: 99%

Energy Balance of Biogas Production from Microalgae: Effect of Harvesting Method, Multiple Raceways, Scale of Plant and Combined Heat and Power Generation

Milledge

Heaven

2017

JMSE

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Abstract:A previously-developed mechanistic energy balance model for production of biogas from the anaerobic digestion of microalgal biomass grown in open raceway systems was used to consider the energetic viability of a number of scenarios, and to explore some of the most critical parameters affecting net energy production. The output demonstrated that no single harvesting method of those considered (centrifugation, settlement or flocculation) produced an energy output sufficiently greater than operational energy inputs to make microalgal biogas production energetically viable. Combinations of harvesting methods could produce energy outputs 2.3-3.4 times greater than the operational energy inputs. Electrical energy to power pumps, mixers and harvesting systems was 5-8 times greater than the heating energy requirement. If the energy to power the plant is generated locally in a combined heat and power unit, a considerable amount of "low grade" heat will be available that is not required by the process, and for the system to show a net operational energy return this must be exploited. It is concluded that the production of microalgal biogas may be energetically viable, but it is dependent on the effective use of the heat generated by the combustion of biogas in combined heat and power units to show an operational energy return.

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“…Non-Newtonian behavior of the viscosity such as shear-thinning was observed for various types of microalgae. [8][9][10][11][12] The concentration dependence of the viscosity was successfully approximated by the Krieger-Dougherty model 13) for suspensions of various microalgae. 8,12,14) Moreover, Rafaï et al 8) and Mussler et al 14) reported that the dependence of the viscosity of Chlamydomonas reinhardtii suspensions on the volume fraction of the Pressure-driven flows of a phototactic microalgae suspension in a transparent circular channel illuminated from its outer side were numerically analyzed.…”

Section: -6)mentioning

confidence: 99%

Numerical Simulation of the Flows of Phototactic Microalgae Suspensions in an Illuminated Circular Channel

Yamamoto

2015

J. Soc. Rheol., Jpn

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Rheological properties of algae slurries for minimizing harvesting energy requirements in biofuel production

Cited by 106 publications

References 20 publications

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

Energy Balance of Biogas Production from Microalgae: Effect of Harvesting Method, Multiple Raceways, Scale of Plant and Combined Heat and Power Generation

Numerical Simulation of the Flows of Phototactic Microalgae Suspensions in an Illuminated Circular Channel

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