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Temperature regulation schemes for improving biomass productivity and nutrient removal rate in outdoor raceway ponds
Journal article   Peer reviewed

Temperature regulation schemes for improving biomass productivity and nutrient removal rate in outdoor raceway ponds

O.E. Isiramen, P.A. Bahri, N.R. Moheimani, A. Vadiveloo, H. Shayesteh and D.A. Parlevliet
Bioresource Technology Reports, Vol.19, Art. 101147
2022
DOI: https://doi.org/10.1016/j.biteb.2022.101147
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Abstract

This study investigated the possibility of enhancing the biomass productivity and nutrient removal of microalgae grown in raceway ponds through temperature regulation. Scenedesmus sp. grown in anaerobically digested abattoir effluent (ADAE) was cultivated outdoor in eight raceway ponds. Seven ponds were subjected to different temperature regulation schemes (from 15 °C to 25 °C) and varying control windows (from 24 h to daytime-only). From the results of this study, an approximate 60 % increase in biomass productivity was observed for ponds operated at a minimum temperature of 15 °C coupled with a 24 h (T15P24) and 12.5 h (T15P12.5) control period in relation to the uncontrolled temperature pond (UTP). Generally, Scenedesmus ponds operated at 15 °C used 60 % less energy for heating, were more efficient in nutrient removal, and showed significantly higher biomass productivities with respect to the uncontrolled/higher temperature regulated ponds. In other words, significant productivity improvements were observed for the systems with lower energy demands.

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