Duckweed biorefinery – Potential to remediate dairy wastewater in integration with microbial protein production. (February 2022)

• Record Type: Journal Article
• Authors: Hemalatha, Manupati; Venkata Mohan, S
• Is Part Of: Bioresource technology. Volume 346(2022)
• Publication Date: 2022-02
• Subjects: Frond Number -- Starch -- Unsaturated Fatty acids -- Amino acids -- Value addition; 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.2021.126499
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Duckweed as efficient source of dairy wastewater treatment and biomass production. Duckweed biomass utilization for cascading diverse routes towards multi-products. DWH grown Bacillus subtilis towards protein food/specific amino acids. Integrated duckweed biorefinery - multiple synergistic processes for value-addition. Abstract: The phytoremediation potential of Duckweed in treating dairy wastewater (DWW) was studied, focusing on its utilization as nutritional biomass. The process resulted in good treatment efficiency with removal of organic carbon of 74% (COD), nitrates of 66% and phosphates of 80%. The increase in duckweed fronds with time was observed (doubling time (DT) - 0.87) resulting in an overall dry weight of 3.73 g. The lentils showed 58% of protein, 29.5% of carbohydrate (with 20% of starch), 15.6% of lipid (FAME-29.3%-saturated, 40.7%-mono- and 30%-poly-unsaturated fatty acids) and good amino acid content (34.04% essential and 65.92% non-essential). The biomass hydrolysate (mild acid pretreated) served as a substrate for microbial protein (MP) production using Bacillus subtilis, resulting in 60% of protein (0.57 g protein/g COD consumed; 0.63 g protein/g N consumed) and 21% of carbohydrate. The duckweed biomass offers multiple benefits including nutritional supplement in food/feed for livestock and poultry industries along with concurrent wastewater treatment as well serves as potential feedstock for biorefinery.