Comparative Life Cycle Assessment of Biodiesel Production from Cardoon (Cynara cardunculus) and Rapeseed Oil Obtained under Spanish Conditions
2013
Dufour, Javier | Arsuaga, Jesús | Moreno, Jovita | Torrealba, Hely | Camacho, Javier
The high demand of fuels and the problems associated with the resources depletion and environmental effects of its production have motivated the search for alternative sources. An interesting option in Spain is the cultivation of Cynara cardunculus as primary raw material of biodiesel manufacture. In this paper, the environmental feasibility of the value chain form cropping to fuel manufacture is studied for Cynara cardunculus oil (CCB) and compared to rapeseed oil (RSB) through life cycle assessment, according to the ISO Standard 14040 and using the Gabi software v4.3 as calculation tool. The functional unit selected was 1 tonne of biodiesel. The total energy consumption and the energy return on energy investment (EROEI) were calculated from energy balance. The indicators for life cycle assessment corresponding to impact categories in human health, ecosystem quality and resources depletion were estimated by means of Ecoindicator 99 method. Obtained EROEI values (calculated considering only the calorific power of the oil) indicate that the energy balance is more positive for Cynara cardunculus than for rapeseed (EROEI = 1.53 for CCB and 1.20 for RSB). Moreover, biodiesel from cardoon shows lower environmental impacts.
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