Title

Bioethanol production from macroalgae and socio-ecological implications Project 2: process economic analysis, energetic and GHG reduction potential of bioethanol production from macroalgae

Date

2016

Abstract

Macroalgae, being one of the promising feedstocks for ethanol production, was assessed for its process economics, and GHG reduction potential. Two scenarios were explored. Scenario 1 considered cellulose, mannitol and alginic acid as substrates for bioethanol production while Scenario 2 includes the first two including alginic acid. Scenario 1 results show that this may not be feasible for ethanol production both economically and environmentally. However, energetic of Scenario 1 shows a positive outcome having an energy ratio of about 1.81:1. On the other hand, Scenario 2 results show that it has a good potential both in terms of its energetic and GHG reduction potential. Energy ratio for Scenario 2 is found to be 6.53:1. Considering the electricity surplus, its GHG reduction potential based on its annual emissions can be as high as 86.44% and based on gasoline offset, up to 60.33%. Moreover, if electricity surplus is not considered, the GHG reduction potential would still be high at 76.49%based on annual emissions and 68.17% based on gasoline offset. All of these high GHG reduction potentials can be realized by using rice hull as feed for power plant. Still, Scenario 2 is not economically feasible considering the prevailing feedstock cost of PhP8-12/L. this case can still be economically feasible by searching for means to lower the processing cost such as by making the technology of conversion of feedstock to bioethanol more efficient.

Book Title

Bioethanol production from macroalgae and socio-ecological implications

Language

English

En – AGROVOC descriptors

SARGASSUM; ALGAE; SPECIES; BIOFUELS; ECONOMIC ANALYSIS; PRODUCTION; ETHANOL; MANNITOL; ALGINIC ACID; REDUCTION

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