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

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

Temperature (°C)	Energy input^a				Energy Output	Net energy output	Output/input
Temperature (°C)	Water heating EI₁	Cultivation and harvesting EI₂	Biodiesel preparation EI₃	Sum of energy input	Biodiesel	Net energy output	Output/input
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

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