Microalgae as a Source of Bioenergy: Products, Processes and Economics

Book Series: Recent Advances in Renewable Energy

Volume 1


José Carlos Magalhães Pires

DOI: 10.2174/97816810852271170101
eISBN: 978-1-68108-522-7, 2017
ISBN: 978-1-68108-523-4
ISSN: 2543-2389 (Print)
ISSN: 2543-2397 (Online)

Microalgae could play an important role in the achievement of sustainability goals related to the generation of renewable energy and g...[view complete introduction]
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Environmental Applications of Microalgae: CO<sub>2</sub> Capture and Nutrient Recycling

- Pp. 297-314 (18)

Meng Wang


Nitrogen (N) and Phosphorus (P) in the wastewater are economical nutrient sources for algae growth. N and P can be assimilated into biomass. The mechanisms of N and P utilization by microalgae was discussed in this chapter. Diverse reactor configurations used for wastewater treatment and algae cultivation were developed to improve the biomass productivity and their settling ability. Enhanced algal-prokaryotic wastewater treatment systems are being designed to improve the wastewater treatment efficiency. A case study of a concentrated animal feeding operation (CAFO) integrating algae cultivation and anaerobic digestion indicated most N ad P are recycled in the form of biomass. The fixation of CO2 by microalgae can be the alternative methods for the CO2 mitigation. The CO2 mitigation rate is affected by the mass transfer and biomass assimilation. Flue gas can be used to reduce the cost of source gases and mitigate greenhouse gases emission. Membrane sparging systems provide fine bubbles and way higher mass transfer efficiency than airlift reactors. Design that improves light penetration should be considered for the scale-up of the complex membrane sparging systems.

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