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Comprehensive evaluation of a cost-effective method of culturing Chlorella pyrenoidosa with unsterilized piggery wastewater for biofuel production

文献类型： 外文期刊

作者： Zhang, Weiguo 1 ; Li, Jiangye 1 ; Zhang, Zhenhua 1 ; Fan, Guangping 1 ; Ai, Yuchun 1 ; Gao, Yan 1 ; Pan, Gang 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, 50 Zhongling St, Nanjing 210014, Peoples R China

2.State Key Lab Breeding Base, Key Lab Food Qual & Safety Jiangsu Prov, 50 Zhongling St, Nanjing 210014, Peoples R China

3.Nottingham Trent Univ, Sch Anim Rural & Environm Sci, Southwell NG25 0QF, Notts, England

关键词： Chlorella pyrenoidosa; Biofuel; Unsterilized piggery wastewater; Nutrient removal; Vampirovibrionales

期刊名称：BIOTECHNOLOGY FOR BIOFUELS （ 影响因子：6.04； 五年影响因子：6.485 ）

ISSN： 1754-6834

年卷期： 2019 年 12 卷

页码：

收录情况： SCI

摘要： BackgroundThe utilization of Chlorella for the dual goals of biofuel production and wastewater nutrient removal is highly attractive. Moreover, this technology combined with flue gas (rich in CO2) cleaning is considered to be an effective way of improving biofuel production. However, the sterilization of wastewater is an energy-consuming step. This study aimed to comprehensively evaluate a cost-effective method of culturing Chlorella pyrenoidosa in unsterilized piggery wastewater for biofuel production by sparging air or simulated flue gas, including algal biomass production, lipid production, nutrient removal rate and the mutual effects between algae and other microbes.ResultsThe average biomass productivity of C. pyrenoidosa reached 0.11g L-1 day(-1)/0.15g L-1 day(-1) and the average lipid productivity reached 19.3mg L-1 day(-1)/30.0mg L-1 day(-1) when sparging air or simulated flue gas, respectively. This method achieved fairish nutrient removal efficiency with respect to chemical oxygen demand (43.9%/55.1% when sparging air and simulated flue gas, respectively), ammonia (98.7%/100% when sparging air and simulated flue gas, respectively), total nitrogen (38.6%/51.9% when sparging air or simulated flue gas, respectively) and total phosphorus (42.8%/60.5% when sparging air or simulated flue gas, respectively). Culturing C. pyrenoidosa strongly influenced the microbial community in piggery wastewater. In particular, culturing C. pyrenoidosa enriched the abundance of the obligate parasite Vampirovibrionales, which can result in the death of Chlorella.ConclusionThe study provided a comprehensive evaluation of culturing C. pyrenoidosa in unsterilized piggery wastewater for biofuel production. The results indicated that this cost-effective method is feasible but has considerable room for improving. More importantly, this study elucidated the mutual effects between algae and other microbes. In particular, a detrimental effect of the obligate parasite Vampirovibrionales on algal biomass and lipid production was found.

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