Journal article
Evaluation of electrocoagulation, flocculation, and sedimentation harvesting methods on microalgae consortium grown in anaerobically digested abattoir effluent
Journal of Applied Phycology, Vol.33, pp.1631-1642
2021
Abstract
Microalgae dewatering is a major bottleneck for biomass production in a large-scale microalgal production system which accounts for 20–60% of production cost. In this study, three dewatering systems of electrocoagulation, flocculation, and pH-induced flocculation were evaluated for microalgal consortium grown in anaerobically digested abattoir effluent at pH 6.5 and 9.5. At the shortest time (15 min) and the highest current density (0.08 A cm−2), the highest microalgae recoveries of 78 and 84% were obtained with the corresponding power consumptions of 1.25 and 1.07 kWh kg−1 for cultures at pH 6.5 and 9.5. For microalgae suspension at pH 6.5, the highest biomass recovery of 77% was obtained when 100 mg L−1 of FeCl3·6H2O (after 15 min) or 100 mg L−1 of Al2(SO4)3·18H2O (after 30 min) was added. However, microalgal recoveries significantly increased when FeCl3·6H2O or Al2(SO4)3·18H2O was used with the culture at pH 9.5. pH-Induced experiments showed that cultures adjusted at pH 10.5 had 36% higher biomass recovery compared to that in cultures at pH 8.5 after 2 h. The results of this study showed that cultures at higher pH (9.5) had a better microalgae recovery in all dewatering systems than cultures at lower pH (6.5).
Details
- Title
- Evaluation of electrocoagulation, flocculation, and sedimentation harvesting methods on microalgae consortium grown in anaerobically digested abattoir effluent
- Authors/Creators
- M. Raeisossadati (Author/Creator)N.R. Moheimani (Author/Creator)P.A. Bahri (Author/Creator)
- Publication Details
- Journal of Applied Phycology, Vol.33, pp.1631-1642
- Publisher
- Springer
- Identifiers
- 991005543126507891
- Copyright
- © The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature 2021
- Murdoch Affiliation
- School of Engineering and Energy; Harry Butler Institute; School of Environmental and Conservation Sciences; Centre for Sustainable Aquatic Ecosystems; Algae R&D Centre
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.171 Photoproductivity
- 3.171.477 Microalgae Biotechnology
- Web Of Science research areas
- Biotechnology & Applied Microbiology
- Marine & Freshwater Biology
- ESI research areas
- Plant & Animal Science