Analysis of Water Footprint of a Photobioreactor Microalgae Biofuel 1 Production System from Blue, Green and Lifecycle Perspectives
نویسندگان
چکیده
8 Microalgae are currently being investigated as a feedstock for the commercial production of 9 transportation fuels, due to their potential scalability and sustainability advantages over conventional 10 feedstocks. The water consumption of microalgae has been postulated to be a resource barrier for 11 large-scale production. This study presents an assessment of the water footprint (WF) of a closed 12 photobioreactor-based biofuel production system, where microalgae cultivation is simulated with 13 geographical and temporal resolution. The assessment focuses on the WF as modeled for four 14 different fuel conversion pathways, and in 10 continental US locations corresponding to high 15 productivity yields. The WF is comprehensively assessed using a hybrid approach which combines 16 process and economic input-output lifecycle analysis method, using three metrics: blue, green and 17 lifecycle WF. Results show that the blue WF of microalgae biofuels varies between 23 and 85 18 m 3 ·GJ -1 depending on process and geographic location. The green WF shows that microalgae 19 cultivation may reduce the required local water withdrawals. Water credits from the co-products vary 20 with allocation methods and end uses, from credits of less than 4 m 3 ·GJ -1 up to credits of 334 m 3 ·GJ 21 1 . Results for the net lifecycle WF with coproduct credits varies between 80 and -291 m 3 ·GJ -1 . 22 Discussion focuses on the sensitivity of microalgae biofuels WF and highlights potential local and 23 national strain of water resources relative to other fuels and biofuels. 24
منابع مشابه
Analysis of water footprint of a photobioreactor microalgae biofuel production system from blue, green and lifecycle perspectives
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