Net Energy and Greenhouse Gas Emission Evaluation of Biodiesel Derived from Microalgae
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- 作者：Liaw Batan ; Jason Quinn ; Bryan Willson ; Thomas Bradley
- 刊名：Environmental Science & Technology
- 出版年：2010
- 出版时间：October 15, 2010
- 年：2010
- 卷：44
- 期：20
- 页码：7975-7980
- 全文大小：205K
- 年卷期：v.44,no.20(October 15, 2010)
- ISSN：1520-5851
文摘
Biofuels derived from microalgae have the potential to replace petroleum fuel and first-generation biofuel, but the efficacy with which sustainability goals can be achieved is dependent on the lifecycle impacts of the microalgae-to-biofuel process. This study proposes a detailed, industrial-scale engineering model for the species Nannochloropsis using a photobioreactor architecture. This process level model is integrated with a lifecycle energy and greenhouse gas emission analysis compatible with the methods and boundaries of the Argonne National Laboratory GREET model, thereby ensuring comparability to preexisting fuel-cycle assessments. Results are used to evaluate the net energy ratio (NER) and net greenhouse gas emissions (GHGs) of microalgae biodiesel in comparison to petroleum diesel and soybean-based biodiesel with a boundary equivalent to “well-to-pump”. The resulting NER of the microalgae biodiesel process is 0.93 MJ of energy consumed per MJ of energy produced. In terms of net GHGs, microalgae-based biofuels avoids 75 g of CO2-equivalent emissions per MJ of energy produced. The scalability of the consumables and products of the proposed microalgae-to-biofuels processes are assessed in the context of 150 billion liters (40 billion gallons) of annual production.