Life cycle optimization for sustainable algal biofuel production using integrated nutrient recycling technology

Muhammadu Bello, Panneerselvam Ranganathan, Feargal Brennan

Research output: Contribution to journalArticle

11 Citations (Scopus)
17 Downloads (Pure)

Abstract

In this study, a multi-objective optimization of sustainable integration of algal biofuel production using nutrient recycling technology, such as anaerobic digestion and hydrothermal liquefaction, is considered. Gross annual profitability and global warming potential (GWP) are the criteria chosen for the design of the algal biofuel production system. Three scenarios, such as full-scale (baseline), pilot-scale (conservative), and lab-scale (nominal), are chosen based on the expected maturity levels and nutrient demand. The results of the optimization produce Pareto sets of optimal solutions for acknowledging the trade-off between the economic and the environmental criteria of the integrated system. It is found that the anaerobic digestion (AD) technology shows better performance in terms of an environmental perspective, displacing the excessive fertilizer requirements due to its maturity in comparison with the hydrothermal liquefaction (HTL) process. However, HTL is a new, evolving, promising nutrient recycling technology which demonstrates economic preferences compared to the AD process due to its low cost of production.

Original languageEnglish
Pages (from-to)9869-9880
Number of pages12
JournalACS Sustainable Chemistry and Engineering
Volume5
Issue number11
Early online date18 Sep 2017
DOIs
Publication statusPublished - 6 Nov 2017

Keywords

  • anaerobic digestion
  • biofuels
  • hydrothermal liquefaction
  • life cycle analysis
  • multiobjective optimization

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