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Table 3 Comparison of biomass productivity, carbohydrate productivity, and CO2 fixation rate of S. obliquus CNW-N grown in different seasons in outdoor surroundings

From: Feasibility of CO2 mitigation and carbohydrate production by microalga Scenedesmus obliquus CNW-N used for bioethanol fermentation under outdoor conditions: effects of seasonal changes

Seasonal condition Avg. light intensity (μmol m−2s−1) Avg. water temperature (oC) Biomass productivity (mg L−1d−1) Carbohydrate (glucose) productivity (mg L−1d−1) CO2 fixation rate (mg L−1d−1)a
Spring (Mar–May) 148.3 ± 44.5 27.1 ± 2.8 190.4 ± 26.8 79.7 ± 19.1 (61.1 ± 16.0) 333.1 ± 46.8
Summer (Jun–Aug) 198.7 ± 43.4 31.3 ± 1.9 205.1 ± 23.1 83.9 ± 9.9 (65.6 ± 7.3) 358.8 ± 40.4
Autumn (Sep–Nov) 171.6 ± 91.7 27.3 ± 4.4 178.9 ± 60.2 75.9 ± 32.1 (60.4 ± 27.0) 313.2 ± 105.4
Winter (Oct–Feb) 93.0 ± 50.2 20.5 ± 1.0 119.2 ± 18.7 47.3 ± 6.0 (35.5 ± 5.2) 208.7 ± 32.7
  1. Values are the mean ± standard deviation of three-month experiments. (CO2 feeding concentration = 2.5%; working volume = 60 L.)
  2. aCalculated from the following equation: CO2 fixation rate = Biomass productivity (mg L−1d−1) × C(%) × 44/12