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Correlation between viscosity, temperature and total solid content of algal biomass
Nico Schneider1, Mandy Gerber1
1Ruhr-University Bochum, Thermodynamics, Universitätsstr. 150, 44801 Bochum, Germany.
Bioresource Technology
|August 25, 2014
Summary
This study developed equations to predict the viscosity of Nannochloropsis salina algae based on temperature and total solids content. The findings are crucial for optimizing algal biomass processing and understanding its non-Newtonian fluid behavior.
Area of Science:
- Biomass Processing
- Fluid Dynamics
- Algal Biotechnology
Background:
- Understanding algal biomass rheology is vital for efficient processing.
- Marine microalgae like Nannochloropsis salina are potential resources for biofuels and bioproducts.
- Rheological properties significantly impact dewatering, pumping, and mixing operations.
Purpose of the Study:
- To establish predictive equations for algal viscosity.
- To investigate the influence of temperature, total solids (TS), and shear rate on viscosity.
- To characterize the rheological behavior of Nannochloropsis salina under various conditions.
Main Methods:
- Experimental determination of viscosity for Nannochloropsis salina.
- Testing untreated, thermally pretreated, and digested algal biomass.
- Applying varying temperatures, TS concentrations, and shear rates.
- Developing and validating mathematical models for viscosity prediction.
Main Results:
- All tested algal samples exhibited non-Newtonian, shear-thinning (pseudoplastic) behavior.
- Algal viscosity increased with higher TS content.
- Viscosity decreased as temperature increased.
- The developed equations showed high accuracy, with deviations within ±4.0%.
Conclusions:
- The study provides a reliable method for calculating algal viscosity.
- Predictive models are essential for optimizing algal biomass handling and processing.
- The rheological properties of Nannochloropsis salina are well-characterized for industrial applications.
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