Harvesting of microalgae cell using oxidized dye wastewater. (September 2015)

• Record Type: Journal Article
• Authors: Seo, Yeong Hwan; Park, Doyoung; Oh, You-Kwan; Yoon, Sukhwan; Han, Jong-In
• Is Part Of: Bioresource technology. Volume 192(2015)
• Page Start: 802
• Page End: 806
• Publication Date: 2015-09
• Subjects: Microalgae -- Harvesting -- Fenton-like reaction -- Dye wastewater; 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.2015.05.074
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Amine group in oxidized dye wastewater could be utilized as microalgae coagulant. Dye having azo group is a better option for amine formation during oxidation. Oxidized wastewater and ferric ion had a synergistic effect in harvesting process. Abstract: In this study, oxidized dye wastewaters were tested for their potential to be used as a cheap coagulant for microalgae harvesting. Two dyes (methylene blue (MB) and methyl orange (MO)) were selected as model dyes, and the Fenton-like reaction under high temperature (90 °C, 1 min) employed as an oxidative treatment option. A maximum harvesting efficiency over 90% was obtained with both MB and MO at a dilution ratio of 5:1 (dye wastewater: cell culture), when the optimal oxidation condition was 20 mg/L of dye, 1 mM of FeCl3, and 0.5% of H2 O2 concentration. This phenomenon could be explained by the possibility that amine groups are formed and exposed in oxidized dyes, which act as a kind of amine-based coagulant just like chitosan. This study clearly showed that dye wastewater, when properly oxidized, could serve as a potent coagulant for microalgae harvesting, potentially rendering the harvesting cost reduced to a substantial degree.