Performance of three microalgal strains in biogas slurry purification and biogas upgrade in response to various mixed light-emitting diode light wavelengths. (July 2015)

• Record Type: Journal Article
• Authors: Zhao, Yongjun; Sun, Shiqing; Hu, Changwei; Zhang, Hui; Xu, Jie; Ping, Lifeng
• Is Part Of: Bioresource technology. Volume 187(2015)
• Page Start: 338
• Page End: 345
• Publication Date: 2015-07
• Subjects: CO2 removal -- Biogas slurry -- Microalgae -- Nutrient removal -- Mixed wavelength ratio; 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.2015.03.130
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: N removal could be increased highly using Scenedesmus obliquus at red:blue = 7:3. CO2 were removed up to 62%. Nutrient removal and biogas upgrading were obtained in the same process. S. obliquus and Chlorella vulgaris achieved the best combined effects. The best mixture ratio was red:blue = 7:3 and 5:5. Abstract: The three microalgal strains were cultivated, namely, Chlorella vulgaris, Scenedesmus obliquus, and Neochloris oleoabundans, by applying mixed light-emitting diode wavelength treatments to biogas slurry in a photobioreactor bag. This study aims to compare the growth and nutrient removal efficiency of the algae and determine their roles for biogas upgrading. At red:blue = 5:5, S. obliquus and C. vulgaris efficiently removed COD and TP, respectively. S. obliquus demonstrated high N removal efficiency at red:blue = 7:3. The same strain significantly improved removal capacity for all nutrients compared with C. vulgaris and N. oleoabundans, particularly at red:blue = 5:5, 7:3, and 3:7. For biogas upgrade, CH4 contents were higher than 75% (v/v) for all strains. The algae exhibited particularly good CH4 enrichment at red:blue = 7:3, 5:5. Results show that microalgal biomass production offers real opportunities for addressing issues, such as nutrient reduction, CO2 removal, and biogas enrichment.