Microalgae-biorefinery with cascading resource recovery design associated to dairy wastewater treatment. (July 2019)

• Record Type: Journal Article
• Authors: Hemalatha, Manupati; Sravan, J. Shanthi; Min, Booki; Venkata Mohan, S.
• Is Part Of: Bioresource technology. Volume 284(2019)
• Page Start: 424
• Page End: 429
• Publication Date: 2019-07
• Subjects: Closed loop -- Reducing sugars -- 3G ethanol -- Biodiesel -- CO2 fixation rate; 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.2019.03.106
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Microalgae as a potential organisms for the production of biobased based products. Acidic hydrolysis for the recovery of carbon rich simple monomers. Defatted microalgae as feedstock for the production of bioethanol. Integration of photosynthesis, hydrolysis and fermentation in a biorefinery approach. Abstract: The potential of microalgae for the treatment of dairy wastewater (DWW) was studied by integrating with bioethanol production. At the end of treatment, organic carbon removal was observed to be 90% with simultaneous removal of nutrients. Biomass concentration increased from 3 rd day and reached to a maximum of 1.4 g L −1 by the end of cycle. The biomolecular composition of microalgae comprised of 38% carbohydrates, 15% proteins and 22% lipids. Reducing sugars extracted from deoiled microalgae showed highest percentage of glucose (54.12%) than other monomers. The reducing sugars obtained were utilized for the production of bioethanol via yeast fermentation using Saccharomyces cerevisiae . This resulted in the production of ethanol (3G) upto 116.2 mg g −1 with simultaneous decrease in reducing sugars upto 92 mg g −1 . The results obtained indicate potential of microalgae to produce multiple biobased products in a biorefinery framework.