Abstract
In this chapter, a framework for sustainable design of algal biorefineries with respect to economic and environmental objectives is presented. As part of the framework, a superstructure is formulated to represent the design space – describing technologies developed for processing various types of algae feedstock for the production of biodiesel and co-products. Relevant data and parameters for each process such as yield, conversion, operational cost is then collected using a standardized format (a generic model) and stored in a database. The sustainable design problem is then formulated mathematically as a mixed integer nonlinear programming problem, and is solved first to identify the optimal designs with respect to economic optimality. These optimal designs are then analyzed further in terms of environmental performance using life cycle analysis. For sustainability analysis, in total five impact categories are calculated including Photochemical oxidation potential (POP), global warming potential (GWP), aquatic ecotoxicity (EcotA), Carcinogenic emissions to urban air (EUAC), and median lethal dose (LD50). To add robustness to the analysis, the framework includes uncertainty analysis using Monte Carlo simulations as well. The application of the framework is highlighted on a case study focusing on feedstock microalgae cultivated in Raceway ponds to produce biodiesel. The framework with the database and superstructure provides an enabling tool to support systematic design and analysis of future and sustainable algal biorefinery concepts.
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List of Acronyms
List of Acronyms
- AHTL :
-
Algae hydrothermal liquefaction
- CAPEX :
-
Capital Investment
- CDF :
-
Cumulative distribution function
- CF :
-
Characterization factor
- CTUe :
-
Comparative toxic units
- EBITDA :
-
Earnings Before Interest, Taxes, Depreciation and Amortization
- EcotA :
-
Aquatic ecotoxicity
- EPA :
-
Environmental protection agency
- EUA C :
-
Carcinogenic emissions to urban air
- EVPI :
-
Expected value of perfect information
- GAMS :
-
General algebraic modeling system
- GWP :
-
Global warming potential
- IRR :
-
Internal rate of return
- LD 50 :
-
Median lethal dose
- MI(N)LP :
-
Mixed integer (non)-linear programming
- MM$/a :
-
Million dollar per year
- NPV :
-
Net present value
- PAF :
-
Potential affected fraction
- PEI :
-
Potential environmental impact
- POP :
-
Photochemical oxidation potential
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Cheali, P., Gargalo, C., Gernaey, K.V., Sin, G. (2015). A Framework for Sustainable Design of Algal Biorefineries: Economic Aspects and Life Cycle Analysis. In: Prokop, A., Bajpai, R., Zappi, M. (eds) Algal Biorefineries. Springer, Cham. https://doi.org/10.1007/978-3-319-20200-6_17
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DOI: https://doi.org/10.1007/978-3-319-20200-6_17
Publisher Name: Springer, Cham
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