Sequential cultivation of microalgae in raw and recycled dairy wastewater: Microalgal growth, wastewater treatment and biochemical composition. (February 2019)

• Record Type: Journal Article
• Authors: Daneshvar, Ehsan; Zarrinmehr, Mohammad Javad; Koutra, Eleni; Kornaros, Michael; Farhadian, Omidvar; Bhatnagar, Amit
• Is Part Of: Bioresource technology. Volume 273(2019)
• Page Start: 556
• Page End: 564
• Publication Date: 2019-02
• Subjects: Microalgae -- Dairy wastewater (DWW) -- Wastewater treatment -- Mixotrophic cultivation -- Fatty acid methyl esters (FAMEs) -- Wastewater reuse; 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.2018.11.059
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Two cycles of microalgal growth were studied in dairy wastewater (DWW). Nutrients concentration affected microalgal growth rate in the second cycle. Chlorophyll a decreased from the first cycle of cultivation to the second one. Two cycles of S. quadricauda cultivation improved pollutants removal efficiency. FAMEs profile of microalgae was different between the two cultivation cycles. Abstract: In this study, two cycles of mixotrophic and one cycle of heterotrophic cultivation of Scenedesmus quadricauda (freshwater) and Tetraselmis suecica (marine water) microalgae in dairy wastewater (DWW) were investigated. Dry weights of S. quadricauda and T. suecica were found to be 0.43 and 0.58 g/L after the first cycle and 0.36, and 0.65 g/L after the second cycle of mixotrophic cultivation, respectively. Chlorophyll a content of both microalgae in the first cycle was significantly higher than the second cycle. S. quadricauda removed 92.15% of total nitrogen, 100% of phosphate, 100% of sulfate and 76.77% of total organic carbon, after two cycles of cultivation. The dominant fatty acids during the first and second cycle of S. quadricauda and T. suecica cultivation were C18:1 and C18:3n-3, respectively. The results suggest that by reusing DWW in two consecutive cycles of microalgal cultivation, higher pollutants removal efficiency and microalgal biomass production can be achieved.