An energy and resource efficient alkaline flocculation and sedimentation process for harvesting of Chromochloris zofingiensis biomass

Mayers, JJ; Landels, AR; Allen, MJ; Albers, E. 2019 An energy and resource efficient alkaline flocculation and sedimentation process for harvesting of Chromochloris zofingiensis biomass. Bioresource Technology Reports, 9. 100358. https://doi.org/10.1016/j.biteb.2019.100358

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Official URL: http://dx.doi.org/10.1016/j.biteb.2019.100358

Abstract/Summary

Harvesting microalgal cultures is often energetically intensive and costly. To improve efficiencies, a two-step harvesting method utilising alkaline flocculation and sedimentation to pre-concentrate cultures can be used prior to centrifugation. When applied to the microalga Chromochloris zofingiensis, high rates of sedimentation (> 90%) were found at low concentrations of base (< 10 mM), with the addition of magnesium to the media (via NaOH/ MgSO4 or Ca(OH)2/Mg(OH)2) to form Mg(OH)2. The process was scaled to 180 L, where sedimentation was as efficient as that achieved at bench scale. Characterisation of the harvested biomass showed comparable com�position (following neutralisation of pH) to biomass recovered solely by centrifugation. The alternative two-step processes were assessed for environmental impacts and cost, which indicated that a two-step harvesting gen�erally performs better than centrifugation alone, but that the locally available electricity source is a critical parameter for optimal solution

Item Type: Publication - Article
Additional Keywords: Microalgae Harvesting Sedimentation Flocculation Life-cycle assessment
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: S Hawkins
Date made live: 14 May 2021 07:49
Last Modified: 14 May 2021 07:49
URI: http://plymsea.ac.uk/id/eprint/9213

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