title: Water-saving analysis on an effective water reuse system in biodiesel feedstock production based on Chlorella zofingiensis fed-batch cultivation.
abstract: The micralgae-based biofuel obtained from dairy wastewater (DWW) is considered a promising source of energy. However, this process consumes water due to the concentration of wastewater being normally too high for some micoralgae cultivation, and dilution is always needed. In this work, the cultivation of microalgae has been examined in non-recirculated water (NR) and recirculated water systems (R). The growth of Chlorella zofingiensis and the nutrient removal of DWW have been recorded. The comparison indicates the R had a little more advantage in biomass and lipid output (1.55, 0.22 g, respectively) than the NR (1.51, 0.20 g, respectively). However, the total chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), and total phosphorus (TP) removals of the R were lower than those of the NR system during the culture. The highest removal of total COD, TKN, and TP were 85.05%, 93.64%, and 98.45%, respectively. Furthermore, no significant difference has been observed in the higher heating value and lipid content of the biomass of the R and NR. The results show the R can save 30% of the total water input during the culture. All above results indicate the R system has great potential in industry.
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn; University of Chinese Academy of Sciences, Beijing 100049, China; †These two authors contributed equally to this work.
authors.forename: Kang
authors.initials: K
authors.lastname: Yang
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn; †These two authors contributed equally to this work.
authors.forename: Lei
authors.initials: L
authors.lastname: Qin
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn.
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Beijing Key Laboratory of Bioprocess, Department of Biochemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Feng
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn.
authors.forename: Pingzhong
authors.initials: P
authors.lastname: Feng
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn.
authors.forename: Shunni
authors.initials: S
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn.
authors.forename: Jingliang
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Guangzhou 510640, China E-mail: yuanzh@ms.giec.ac.cn.
authors.forename: Zhenhong
authors.initials: Z
authors.lastname: Yuan
mesh_terms: D001673:Biodegradation, Environmental; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D001709:Biotechnology / Q000295:instrumentation*; D002708:Chlorella / Q000254:growth & development* / Q000378:metabolism; D058086:Microalgae / Q000254:growth & development* / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D062065:Wastewater / Q000032:analysis*; D014867:Water / Q000032:analysis*
chemical_list: D056804:Biofuels; D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater; D014867:Water