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Improving pH control and carbon dioxide utilisation efficiency in microalgae cultivation systems with the use of a Proportional-integral + dead-zone control strategy

Isiramen, O.E., Bahri, P.A.ORCID: 0000-0003-4661-5644, Moheimani, N.R.ORCID: 0000-0003-2310-4147, Vadiveloo, A.ORCID: 0000-0001-8886-5540, Shayesteh, H. and Parlevliet, D.A. (2022) Improving pH control and carbon dioxide utilisation efficiency in microalgae cultivation systems with the use of a Proportional-integral + dead-zone control strategy. Bioresource Technology Reports, 17 . Art. 100917.

Link to Published Version: https://doi.org/10.1016/j.biteb.2021.100917
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Abstract

This study investigated the use of an innovative Proportional Integral (PI) + dead-zone control strategy to improve pH control and to overcome the negative environmental impact associated with the currently employed on/off pH control schemes for microalgae cultivation. Scenedesmus sp. grown in anaerobically digested abattoir effluent (ADAE) was used in this study to evaluate the effectiveness of the alternative/advanced control strategy with respect to the on/off control strategy. Results obtained showed that the PI+dead-zone control strategy significantly improved the regulation of the pH level in the pond as evident by noteworthy reductions of key controller performance indicators with respect to the on/off control strategy. Additionally, the advanced control scheme was able to reduce the CO2 usage by a remarkable 59.21% (highest recorded in related literature), resulting in a reduction in CO2 associated costs (approximately 60%) and most importantly, reduction in the amount of greenhouse gas lost to the atmosphere.

Item Type: Journal Article
Murdoch Affiliation(s): Engineering and Energy
Environmental and Conservation Sciences
Algae R&D Centre
Centre for Water, Energy and Waste
Harry Butler Institute
Publisher: Elsevier Ltd.
Copyright: © 2021 Elsevier Ltd.
URI: http://researchrepository.murdoch.edu.au/id/eprint/63420
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