Microalgae-based biodiesel: economic analysis of downstream process realistic scenarios

Area of Science:

• Biotechnology
• Renewable Energy
• Chemical Engineering

Background:

• Microalgae oil is a promising feedstock for biodiesel due to high lipid productivity and cultivation flexibility.
• Economic feasibility of microalgae-based biodiesel hinges on optimizing the entire production process.
• Factors like strain selection and harvesting methods influence ash and lipid content in microalgae biomass.

Purpose of the Study:

• To model and analyze different scenarios for microalgae oil harvesting, extraction, and transesterification.
• To identify process bottlenecks impacting the economic viability of microalgae biodiesel production.
• To critically assess the overestimation of microalgae lipid potential for biodiesel.

Main Methods:

• Utilized computational tools for process modeling.
• Simulated various harvesting, oil extraction, and transesterification scenarios.
• Analyzed the impact of process parameters on lipid yield and ash content.

Main Results:

• Identified critical process bottlenecks in microalgae oil to biodiesel conversion.
• Demonstrated that only a fraction (approx. 30%) of dry biomass consists of suitable neutral/saponifiable lipids.
• Highlighted potential overestimation of microalgae's contribution to biodiesel production.

Conclusions:

• Rigorous process modeling is essential for accurate assessment of microalgae biodiesel feasibility.
• Optimization of harvesting, extraction, and transesterification is crucial for economic viability.
• The actual potential of microalgae lipids for biodiesel may be overestimated without detailed process analysis.