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Recovery and reuse of alginate in an immobilized algae reactor

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Version 2 2019-10-09, 18:51
Version 1 2019-09-27, 16:08
journal contribution
posted on 2019-10-09, 18:51 authored by Olga Murujew, Rachel Whitton, Matthew Kube, Linhua Fan, Felicity Roddick, Bruce Jefferson, Marc Pidou

The use of microalgae for nutrients removal from wastewater has attracted more attention in recent years. More specifically, immobilized systems where algae cells are entrapped in beads in a matrix of a polysaccharide such as alginate have shown a great potential for nutrients removal from wastewater to low levels with reduced retention times and hence smaller footprint. However, a significant operational cost in the up-scaling of alginate-immobilized algae reactors will be the gelling agent alginate. To reduce expenditure of this consumable a proof-of-concept is given for an alginate recycling method using sodium citrate as a dissolving agent. Using algae beads made from virgin and recycled alginate yielded comparable removal rates for both phosphorus and nitrogen compounds from wastewater. At labscale, an alginate recovery of approximately 70% can be achieved which would result in a net operational cost reduction of about 60%.

Funding

Funding for this study was gratefully received by Severn Trent Water and the Royal Society of Chemistry Water Science group in form of the Alan Tetlow Memorial Bursary.

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