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The environmental sustainability of microalgae as feed for aquaculture: a life cycle perspective
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TLDR
In the upscaling scenarios, microalgae production for aquaculture purposes appeared to be more sustainable in resource use than a reference fish feed and the carbon footprint to decline by factor 20.Abstract:
The environmental sustainability of microalgae production for aquaculture purposes was analyzed using exergy analysis (EA) and life cycle assessment (LCA). A production process (pilot 2012, 240 m(2)) was assessed and compared with two upscaling scenarios (pilot 2013, 1320 m(2) and first production scale 2015, 2.5 ha). The EA at process level revealed that drying and cultivation had the lowest efficiencies. The LCA showed an improvement in resource efficiency after upscaling: 55.5 MJ(ex,CEENE)/MJ(ex) DW biomass was extracted from nature in 2012, which was reduced to 21.6 and 2.46 MJ(ex,CEENE)/MJ(ex) DW in the hypothetical 2013 and 2015 scenarios, respectively. Upscaling caused the carbon footprint to decline by factor 20 (0.09 kg CO2,eq/MJ(ex) DW in 2015). In the upscaling scenarios, microalgae production for aquaculture purposes appeared to be more sustainable in resource use than a reference fish feed (7.70 MJ(ex,CEENE) and 0.05 kg CO2,eq per MJ(ex) DW).read more
Citations
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References
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The Exergy Method of Thermal Plant Analysis
TL;DR: The Exergy Method as mentioned in this paper is a method of thermodynamic analysis in which the basis of evaluation of the thermodynamic losses follows from the Second Law rather than the First Law of Thermodynamics and has gained in the last few years many new followers, both among practising engineers and academics.
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Biodiesel from microalgae beats bioethanol.
TL;DR: Biodiesel from microalgae seems to be the only renewable biofuel that has the potential to completely displace petroleum-derived transport fuels without adversely affecting supply of food and other crop products.
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Exergy Analysis of Thermal, Chemical and Metallurgical Processes
TL;DR: In this paper, the exergetic efficiency of thermal, chemical, and metallurgical processes is analyzed and the application of the exergy concept to the problem of the economical optimization of complex plants and the implications to the environment of pollution due to external exergy losses.
Journal ArticleDOI
The potential of sustainable algal biofuel production using wastewater resources
TL;DR: The current research on this topic is reviewed and the potential benefits and limitations of using wastewaters as resources for cost-effective microalgal biofuel production are discussed.