Comparison between coagulation-flocculation and ozone-flotation for Scenedesmus microalgal biomolecule recovery and nutrient removal from wastewater in a high-rate algal pond. (July 2018)

• Record Type: Journal Article
• Authors: Oliveira, Gislayne Alves; Carissimi, Elvis; Monje-Ramírez, Ignacio; Velasquez-Orta, Sharon B.; Rodrigues, Rafael Teixeira; Ledesma, María Teresa Orta
• Is Part Of: Bioresource technology. Volume 259(2018)
• Page Start: 334
• Page End: 342
• Publication Date: 2018-07
• Subjects: Scenedesmus sp. -- Coagulation-flocculation -- Ozone-flotation -- Wastewater -- High rate algal pond; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.03.072
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Scenedesmus sp. cultivated in untreated wastewater in high-rate algal pond. High efficiency in the removal of nutrients from wastewater by treatment with Scenedesmus sp. Larger microalgae harvesting by coagulation-flocculation. Increased biomolecule recover by ozone flotation, due to cell lysis caused by ozone. Abstract: 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.