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Open AccessArticle

Development of Full-Cycle Utilization of Chlorella sorokiniana Microalgae Biomass for Environmental and Food Purposes

1
Department of Institute of Civil Engineering, Peter the Great Sankt-Petersburg Polytechnic University, 194064 Saint Petersburg, Russia
2
Department of Material Sciences and Process, Institute of Chemical and Energy Engineering, Vienna Engineering, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
3
Department of Material Sciences and Process Engineering, Vienna Institute of Chemical and Energy Engineering, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
4
Department of Economics and Organization Production, Kazan State Power Engineering University, 420066 Kazan, Russia
*
Author to whom correspondence should be addressed.
Energies 2020, 13(10), 2648; https://doi.org/10.3390/en13102648
Received: 12 April 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Feature Papers in Bio-Energy)
The application of microalgae biomass of Chlorella sorokiniana as environmentally friendly biosorbents for removing potentially toxic elements (PTE) from water and as a source of biofuel has been thoroughly studied. In this paper, we investigate its physicochemical properties infrared spectroscopy (IR spectra), microstructure, adsorption properties); we have managed to isolate the lipid complex, which amounted to 20% of dry biomass. Studies of the lipid complex showed that 80.02% of lipids are unsaturated fatty acids (C18:1, C18:2, C18:3). Additionally, we have investigated the efficiency of using the residual biomass obtained after lipid extraction for water purification from rare-earth metals (REM) and PTE. To increase the sorption properties of residual biomass, its thermal modification was carried out and sorption materials based on heat-treated residual biomass and chitosan were created. The physicochemical and mechanical properties of the obtained sorption materials were studied. The total sorption capacity was 31.9 mg/g for REM and 349.7 mg/g for PTE. Moreover, we propose a new method for the disposal of spent sorbents as additional fuel. Spent sorbents can be considered to be biofuel in terms of energy content (20.7 MJ*kg−1). The results of this study provide the basis for increased use of microalgae. View Full-Text
Keywords: microalgae; sorbents; water purification; REM; PTE; lipids; Omega-3; biofuel microalgae; sorbents; water purification; REM; PTE; lipids; Omega-3; biofuel
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Politaeva, N.; Smyatskaya, Y.; Al Afif, R.; Pfeifer, C.; Mukhametova, L. Development of Full-Cycle Utilization of Chlorella sorokiniana Microalgae Biomass for Environmental and Food Purposes. Energies 2020, 13, 2648.

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