Anyaoha et al. (2024): Potentials for microalgae sequestration of carbon dioxide (CO2) from composting off-gas; a review

Kelechi E. Anyaoha, Roman Maletz, André Rückert, Christina Dornack IN: Resources, Conservation & Recycling Advances, 22, 200213, https://doi.org/10.1016/j.rcradv.2024.200213

This review examines the available information on composting off-gas dynamics, particularly CO₂ evolution, and the challenges and prospects of CO₂ use in microalgal cultivation, ensuring circularity in the composting process. This review recommends the utilization of CO₂ from composting as alternative to direct air extraction. However, achieving higher CO₂ concentration relative to oxygen is challenging. While efforts are made towards reduction in greenhouse gas emissions during composting, near zero oxygen concentration in the off-gas is essential to enhancing CO₂ utilization in microalgae cultivation. This should be achieved without compromising compost quality such as germination index and chemical oxygen demand/heavy metals reduction efficiency.

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