title: Performance of three microalgal strains in biogas slurry purification and biogas upgrade in response to various mixed light-emitting diode light wavelengths.
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.
authors: College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
authors: Yongjun
authors: Y
authors: Zhao
authors: College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
authors: Shiqing
authors: S
authors: Sun
authors: Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, Linyi University, Linyi 276005, China.
authors: Changwei
authors: C
authors: Hu
authors: College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
authors: Hui
authors: H
authors: Zhang
authors: College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China. Electronic address: xujie1688@126.com.
authors: Jie
authors: J
authors: Xu
authors: Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China. Electronic address: lfping2005@gmail.com.
authors: Lifeng
authors: L
authors: Ping
mesh_terms: D003116:Color; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D058086:Microalgae / Q000145:classification* / Q000502:physiology* / Q000528:radiation effects; D058433:Photobioreactors / Q000382:microbiology*; D012666:Semiconductors; D012722:Sewage / Q000382:microbiology*; D013045:Species Specificity
chemical_list: D012722:Sewage; D008697:Methane
keywords: Biogas slurry; CO(2) removal; Microalgae; Mixed wavelength ratio; Nutrient removal