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Comparison between coagulation-flocculation and ozone-flotation for Scenedesmus microalgal biomolecule recovery and nutrient removal from wastewater in a high-rate algal pond

Lookup NU author(s): Dr Sharon Velasquez Orta



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


© 2018 Elsevier Ltd The removal of nutrients by Scenedesmus sp. in a high-rate algal pond, and subsequent algal separation by coagulation-flocculation or flotation with ozone to recover biomolecules, were evaluated. Cultivation of Scenedesmus sp. in wastewater resulted in complete NH3-H removal, plus 93% total nitrogen and 61% orthophosphate removals. Ozone-flotation obtained better water quality results than coagulation-flocculation for most parameters (NH3-N, NTK, nitrate and nitrite) except orthophosphate. Ozone-flotation, also produced the highest recovery of lipids, carbohydrates and proteins which were 0.32 ± 0.03, 0.33 ± 0.025 and 0.58 ± 0.014 mg/mg of biomass, respectively. In contrast, there was a low lipid extraction of 0.21 mg of lipids/mg of biomass and 0.12–0.23 mg of protein/mg of biomass in the coagulation-flocculation process. In terms of biomolecule recovery and water quality, ozone showed better results than coagulation-flocculation.

Publication metadata

Author(s): Oliveira GA, Carissimi E, Monje-Ramirez I, Velasquez-Orta SB, Rodrigues RT, Ledesma MTO

Publication type: Article

Publication status: Published

Journal: Bioresource Technology

Year: 2018

Volume: 259

Pages: 334-342

Print publication date: 01/07/2018

Online publication date: 17/03/2018

Acceptance date: 14/03/2018

Date deposited: 12/04/2018

ISSN (print): 0960-8524

ISSN (electronic): 1873-2976

Publisher: Elsevier Ltd


DOI: 10.1016/j.biortech.2018.03.072


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