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Author Spotlight: Scaling Microalgal Biotechnology for Enhanced Biomethane Production

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Wastewater treatment process using immobilized microalgae.

Ihana Aguiar Severo¹, Otto Gustavo de Avila Azevedo², Paulo Alexandre Silveira da Silva³

¹Graduate Program in Materials Science Engineering (PIPE), Federal University of Parana (UFPR), Curitiba, PR 81531-980, Brazil; Sustainable Energy Research & Development Center (NPDEAS), Federal University of Paraná (UFPR), Curitiba, PR 81531-980, Brazil; Department of Mechanical Engineering, FAMU-FSU College of Engineering, Energy and Sustainability Center, Center for Advanced Power Systems (CAPS), Florida A&M University, Florida State University, 32310-6046, Tallahassee, FL, USA

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|August 31, 2024

Summary

This summary is machine-generated.

Immobilized microalgae (Tetradesmus obliquus) in alginate beads significantly boosted biomass production and nutrient removal from swine wastewater. This method offers a cost-effective solution for sustainable microalgae cultivation and wastewater treatment.

Keywords:

alginate biodigested swine manure cell immobilization nutrient removal

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Area of Science:

Environmental Biotechnology
Microalgal Cultivation
Wastewater Treatment

Background:

Microalgae biomass offers diverse applications but faces scale-up challenges due to high media and harvesting costs.
Utilizing alternative wastewater streams like swine manure can reduce cultivation expenses.
Immobilization techniques may enhance microalgal performance and simplify harvesting.

Purpose of the Study:

To evaluate the growth and nutrient removal efficiency of immobilized Tetradesmus obliquus in swine manure-based wastewater.
To compare the performance of immobilized cells versus free cells.
To assess the potential of this approach for sustainable wastewater treatment.

Main Methods:

Cultivation of immobilized Tetradesmus obliquus within sodium alginate beads.
Comparison with free-cell cultures in swine manure-based wastewater.
Measurement of biomass production, chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) removal.

Main Results:

Immobilized cells achieved approximately 2.3 times higher biomass production than free cells, particularly at 10% effluent concentration.
Immobilized cells demonstrated significantly enhanced organic carbon removal, reducing COD by 62% in 48 hours compared to 6% for free cells.
Both immobilized and free cells showed high nutrient removal efficiencies, exceeding 99% for phosphorus and efficiently removing total nitrogen.

Conclusions:

Immobilization of Tetradesmus obliquus in alginate beads enhances biomass yield and nutrient removal efficiency in swine manure wastewater.
This approach offers a viable strategy for cost-effective microalgae cultivation and effective wastewater remediation.
The findings support the potential of immobilization and alternative substrates for sustainable biotechnology applications.