Microalgal bio-flocculation: present scenario and prospects for commercialization

Area of Science:

• Biotechnology
• Renewable Energy
• Environmental Science

Background:

• Global concern for sustainable renewable biofuel production.
• Limitations of first- and second-generation biofuels.
• Microalgae as a promising feedstock for third-generation biofuels, offering greenhouse gas mitigation and carbon sequestration.

Purpose of the Study:

• To review the current status of bio-flocculation for industrial-scale microalgal harvesting.
• To evaluate microbial strains as prospective bioflocculants.
• To highlight the advantages of bio-flocculation over conventional methods.

Main Methods:

• Review of existing literature on bio-flocculation techniques for microalgae.
• Analysis of microbial strains suitable for bio-flocculation.
• Comparison of bio-flocculation with chemical flocculation methods.

Main Results:

• Bio-flocculation is identified as a promising harvesting method due to its recovery efficiency, operational economics, and cost-effectiveness.
• Microbial strains offer an eco-friendly alternative to chemical flocculants, avoiding additional chemical inputs.
• The choice of harvesting technique should align with the final utilization of the harvested microalgal biomass.

Conclusions:

• Bio-flocculation presents a viable and sustainable approach for large-scale microalgal harvesting.
• Further research into genetically modified microalgae with self-flocculation properties is recommended.
• Focusing on the end-use of biomass is crucial for selecting the optimal harvesting strategy.