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Title: Effect of microalgae cell composition and size on responsiveness to ultrasonic harvesting

Journal Article · · Journal of Applied Phycology
 [1];  [2];  [2]; ORCiD logo [2]
  1. Colorado State Univ., Fort Collins, CO (United States); Colorado School of Mines
  2. Colorado State Univ., Fort Collins, CO (United States)

Ultrasonic harvesting could reduce the energy consumption and costs associated with separating microalgae from growth media. The responsiveness of microalgae cells to an ultrasonic standing wave depends on the cell radius and acoustic contrast factor (ACF). The ACF can vary as cell composition (e.g. lipid, protein, carbohydrate content) varies depending on the algae strain, cultivation conditions, and growth stage. Here, two independent experimental methods were used to characterize the ACF of three algae ;strains—Nannochloropsis salina, Chlamydomonas reinhardtii, and Tetraselmis chuii—as a function of dynamic cellular composition over 9- to 14-day growth periods. For N. salina, lipid content increased from 25 ± 1% to 33 ± 1% ash-free dry weight (AFDW) and ACF decreased by 46% (from 0.041 ± 0.002 to 0.022 ± 0.002) between growth days 3 and 10. For C. reinhardtii, lipid content increased from 26 ± 1% to 40 ± 1% AFDW and ACF decreased by 33% (from 0.051 ± 0.013 to 0.034 ± 0.006) between growth days 3 and 9. For T. chuii, lipid content and ACF remained stable (~ 10% AFDW and ~ 0.3) over the growth period. ACF decreased as lipid content increased because lipids have a negative ACF in the growth media; however, cell size had a greater impact on cell responsiveness because the ratio of the acoustic radiation force to the drag force is proportional to cell radius squared.

Research Organization:
Colorado School of Mines, Golden, CO (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0007089
OSTI ID:
1843738
Journal Information:
Journal of Applied Phycology, Journal Name: Journal of Applied Phycology Journal Issue: 3 Vol. 31; ISSN 0921-8971
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

References (45)

Evaluation of electro-coagulation-flocculation for harvesting marine and freshwater microalgae journal May 2011
An ultrasonically enhanced inclined settler for microalgae harvesting journal December 2014
Ion metabolism in a halophilic blue-green alga, Aphanothece halophytica journal January 1976
Viscous effects in the acoustic manipulation of algae for biofuel production journal March 2011
High-value products from microalgae—their development and commercialisation journal January 2013
Life cycle analysis of algae biodiesel journal June 2010
Rapid Quantitative Analysis of Lipids Using a Colorimetric Method in a Microplate Format journal November 2010
Current Large-Scale US Biofuel Potential from Microalgae Cultivated in Photobioreactors journal November 2011
Ultrasonic velocity as a probe of emulsions and suspensions journal July 1987
Review of the folin phenol protein quantitation method of lowry, rosebrough, farr and randall journal December 1979
The amino-acid and sugar composition of 16 species of microalgae used in mariculture journal March 1991
Lipid and biomass production by the halotolerant microalga Nannochloropsis salina journal January 1987
Protein Measurement with the Folin Phenol Reagent journal November 1951
Changes in biochemical profile of Tetraselmis gracilis I. Comparison of two culture media journal January 1997
Getting to low-cost algal biofuels: A monograph on conventional and cutting-edge harvesting and extraction technologies journal October 2014
Energy and operating cost assessment of competing harvesting methods for D. salina in a β-carotene production process journal November 2015
Direct transesterification of wet microalgal biomass for preparation of biodiesel journal November 2015
Quantification of effects of flue gas derived inorganic contaminants on microalgae growth system and end fate of contaminants journal July 2017
Measurement of acoustic properties of microalgae and implications for the performance of ultrasonic harvesting systems journal April 2018
Protein measurements of microalgal and cyanobacterial biomass journal October 2010
Potential yields and properties of oil from the hydrothermal liquefaction of microalgae with different biochemical content journal January 2011
Renewable fuels from algae: An answer to debatable land based fuels journal January 2011
Nannochloropsis production metrics in a scalable outdoor photobioreactor for commercial applications journal August 2012
Effect of Conway Medium and f/2 Medium on the growth of six genera of South China Sea marine microalgae journal August 2013
Enhancement of lipid production in low-starch mutants Chlamydomonas reinhardtii by adaptive laboratory evolution journal November 2013
Rapid quantification of microalgal lipids in aqueous medium by a simple colorimetric method journal March 2014
The potentials and challenges of algae based biofuels: A review of the techno-economic, life cycle, and resource assessment modeling journal May 2015
Biodiesel from microalgae journal May 2007
A new method for rapid determination of carbohydrate and total carbon concentrations using UV spectrophotometry journal September 2013
Importance of algae oil as a source of biodiesel journal January 2011
Constraints to commercialization of algal fuels journal September 2013
Biodiesel from microalgae beats bioethanol journal March 2008
Algal Biomass: Occurrence of the Main Inorganic Elements and Simulation of Ash Interactions with Bed Material journal May 2014
Determination of biomass dry weight of marine microalgae journal April 1997
Flocculation of algae using chitosan journal January 2002
Ultrasound, a new separation technique to harvest microalgae journal March 2003
Acoustofluidics 7: The acoustic radiation force on small particles journal January 2012
Biovolume Calculation for Pelagic and Benthic Microalgae journal April 1999
A Sound Velocity Method for Determining the Compressibility of Finely Divided Substances journal November 1947
The Variation with Temperature of the Principal Elastic Moduli of NaCl near the Melting Point journal January 1942
The Path to Triacylglyceride Obesity in the sta6 Strain of Chlamydomonas reinhardtii journal February 2014
Structural Correlates of Cytoplasmic and Chloroplast Lipid Body Synthesis in Chlamydomonas reinhardtii and Stimulation of Lipid Body Production with Acetate Boost journal October 2011
Cell exfoliation, separation, and concentration in the field of a standing ultrasonic wave journal July 2009
Determination of Total Solids and Ash in Algal Biomass: Laboratory Analytical Procedure (LAP) report January 2016
Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae journal January 2015