Process and technoeconomic analysis of bioethanol production fromresidual biomass of marine macroalgae Ulva lactuca
Residual biomass Ulva lactuca Bioethanol Fermentation Techno-economic analysis
In the present work, the residual biomass of the green seaweed Ulva lactuca was chosen as feedstock to undergo separate
hydrolysis and fermentation process to produce bioethanol. The hydrolysis process was optimized for cellulase,
biomass, temperature, and time conditions. The maximum yield of fermentable sugars was 13.48 mg/mL. The recovered
hydrolysate was subjected to fermentation using Saccharomyces cerevisiae. The bioethanol produced was
subjected to gas chromatography coupled mass spectrometry analysis to determine the presence of ethanol. The technical
performance and economic feasibility of the bioethanol production from U. lactuca were evaluated using the labscale
data obtained for optimized conditions. The plant capacity was 10 MT/day of bioethanol production. The plant's
capital investment and annual operating cost were 3.18 M$ and 0.86 M$ respectively. The total annual revenue of the
plant was 1.41 M$. The minimumselling price of bioethanol was 0.47 $/kg. The ROI, payback period, IRR and NPV of
the plant were 16.99 %, 5.89 years, 11.57 % and 291,000 $ respectively. The utilization of residual biomass for
biofuels helps to develop an economic and environmentally sustainable plant.
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In the present work, the residual biomass of the green seaweed Ulva lactuca was chosen as feedstock to undergo separate
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