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Table 2 The calculation of energy input and output (kJ) for microalgae biodiesel process at different temperatures

From: Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4

Temperature (°C) Energy inputa Energy Output Net energy output Output/input
Water heating EI1 Cultivation and harvesting EI2 Biodiesel preparation EI3 Sum of energy input Biodiesel
4 16.8 3.11 0.012 19.92 13.42 −6.50 0.67
10 42 5.20 0.020 47.22 22.43 −24.79 0.48
15 63 6.23 0.025 69.26 26.87 −42.39 0.39
25 105 7.35 0.031 112.38 33.74 −78.64 0.30
  1. aThe data were calculated based on 1L pure medium