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Table 3 Comparison of estimated biodiesel properties of algal lipids from the different isolates as a function of the dilution rate along with the US and European specifications (B100), and those of common vegetable oils

From: Evaluation of native microalgae from Tunisia using the pulse-amplitude-modulation measurement of chlorophyll fluorescence and a performance study in semi-continuous mode for biofuel production

  Chlorella sp. Scenedesmus sp. Nitzschia sp.
D, 1/day 0.08 0.20 0.30 0.38 0.45 0.50 0.10 0.20 0.30 0.40 0.50 0.10 0.20 0.30
KV, at  °C mm2/s 4.20 4.00 3.90 4.10 4.20 4.20 3.90 4.10 4.10 4.00 4.00 4.80 4.80 4.70
Specific gravity, Kg/L 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.87 0.87 0.87
CP, °C − 2.10 − 4.60 − 8.00 − 2.90 − 2.00 − 1.00 − 8.20 − 2.90 − 2.80 − 4.00 − 3.70 11.20 11.30 10.20
CN, min 51.80 50.60 48.90 51.40 51.90 52.40 48.80 51.40 51.50 50.90 51.00 58.50 58.50 58.00
IV, g I2/100 g 135.80 149.40 169.00 140.20 135.20 130.00 170.00 140.50 139.80 146.40 144.70 61.50 60.90 67.00
HHV, MJ/Kg 41.40 41.80 42.20 41.50 41.40 41.30 42.20 41.50 41.50 41.70 41.60 39.70 39.70 39.80
  1. Data are mean value of two repetitions
  2. KV: Kinematic viscosity; CP: cloud point; CN: cetane number; IV: iodine value; HHV: high heating value
  Tetraselmis sp. ASTM D6751-08 EN 14214 Camelina Sunflower Soy
D, 1/day 0.10 0.20 0.30 0.40 0.50 0.60 0.80 0.90      
KV, at  °C mm2/s 4.40 4.40 4.40 4.40 4.40 4.50 4.40 4.40 1.9–6.0 3.5–5 3.8 4.42 4.26
Specific gravity, Kg/L 0.87 0.87 0.87 0.87 0.87 0.87 0.87 0.87 0.85–0.9 0.88 0.87 0.88
CP,  °C 2.60 2.80 2.80 2.10 3.30 4.50 2.70 2.40 3 2
CN, min 54.20 54.30 54.30 53.90 54.60 55.10 54.30 54.00 47 51 50.4 51.1 51.3
IV, g I2/100 g 109.50 108.20 108.00 112.30 105.30 99.0 108.80 110.90 120 152.8 128.7 125.5
HHV, MJ/Kg 40.80 40.80 40.80 40.90 40.70 40.60 40.80 40.80 45.2 40.6 39.7
  1. Data are mean value of two repetitions
  2. KV: Kinematic viscosity; CP: cloud point; CN: cetane number; IV: iodine value; HHV: high heating value