Influence of starch on microalgal biomass recovery, settleability and biogas production

Bioresource Technology
Raquel GutiérrezEnrica Uggetti

Abstract

In the context of wastewater treatment with microalgae cultures, coagulation-flocculation followed by sedimentation is one of the suitable options for microalgae harvesting. This process is enabled by the addition of chemicals (e.g. iron). However, in a biorefinery perspective, it is important to avoid possible contamination of downstream products caused by chemicals addition. The aim of this study was to evaluate the effect of potato starch as flocculant for microalgal biomass coagulation-flocculation and sedimentation. The optimal flocculant dose (25mg/L) was determined with jar tests. Such a concentration led to more than 95% biomass recovery (turbidity<9NTU). The settleability of flocs was studied using an elutriation apparatus measuring the settling velocities distribution. This test underlined the positive effect of starch on the biomass settling velocity, increasing to >70% the percentage of particles with settling velocities >6.5m/h. Finally, biochemical methane potential tests showed that starch biodegradation increased the biogas production from harvested biomass.

References

Mar 20, 2012·Bioresource Technology·Hongli ZhengHe Huang
Jan 23, 2013·Trends in Biotechnology·Dries VandammeKoenraad Muylaert
Feb 19, 2013·Bioresource Technology·Mohammad Sadegh FaridBagher Anvaripour
Jun 18, 2014·Bioresource Technology·H Agnes KurniawatiJ C Liu
Jul 2, 2014·Bioresource Technology·Carlos O Letelier-GordoIrini Angelidaki

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Citations

Sep 30, 2017·FEMS Microbiology Letters·Akhilesh Kumar Singh, Nirupama Mallick
Mar 9, 2020·The Science of the Total Environment·Fares Almomani

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