ENGINEERING JOURNAL CHIANG MAI UNIVERSITY

Volume 26, No. 01, Month APRIL, Year 2019, Pages 193 - 206

Ethanol production from algae in cultivation using waste water of vegetable and fruit processing plant

Supakid Chaipoot, Rewat Phongphisutthinant, Wassana Kamopas, Wasin Wongwilai and Komsan Rungrit

Abstract Download PDF

This research studied ethanol production from algae cultivated by waste water from processing and product development plant of Royal Project Foundation. Ethanol productions from 4 strains of algae including Pediastrum sp. AARL G060 , Chlorella sp. AARL G049 , Microalgal consortium and Scenedesmus sp.AARL G085 were studied along with their production cost and economic value. The results showed that the microalgal consortium was the most suitable raw material for ethanol production. Steam explosion at 45 psi for 50 minutes combined with enzymaic digestion by cellulase with concentration of 2.00 ml per 1 g of algae at 50 ° C for 70 hours resulted in 20.25 mg/ml of reducing sugar, 21.36 mg/ml of total sugar content and 1.10 mg/ml of nonreducing sugar. In addition, the optimal condition for ethanol production from algae was 1.30 % Saccharomyces cerevisiae using, incubated at pH 6.71 and room temperature for 8 days. The resulting ethanol concentration was 7.17%. When increase the amount of Microalgal consortium to 400 g, it was found that ethanol production from the pretreated algae under optimal conditions had ethanol concentration, reducing sugar and volumes of liquids of 7.30%, 1.15 mg / ml and 3,289 ml, respectivetly. The cost of ethanol production from algae was 39.08 baht per liter with simple payback period of 4.77 years and 21% of return on investment.

Keywords

Ethanol, Algae Cultivation, Waste Water, Vegetable and Fruit Processing Plant

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