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Table 1 Photosynthetic efficiency, specific growth rate, and doubling time of Dunaliella tertiolecta under different sodium bicarbonate concentrations during cultivation using rotating floating photobioreactor

From: An enclosed rotating floating photobioreactor (RFP) powered by flowing water for mass cultivation of photosynthetic microalgae

Day TPARa (mol m−2 day−1) APAREb (kJ m−2) Photosynthetic efficiency (PE) Specific growth rate (μ) Doubling time (t d)
Controlc (%) Treatment 1d (%) Treatment 2e (%) Control (h−1) Treatment 1 (h−1) Treatment 2 (h−1) Control (h) Treatment 1 (h) Treatment 2 (h)
1 12.25 2659.24 0f 0 0 0 0 0 g
2 13.03 5485.94 0.82 ± 0.39 0.82 ± 0.71 0 0.0039 ± 0.0033A 0.0131 ± 0.0015B 0.0124 ± 0.0024B 177.69 ± 9.29X 53.28 ± 6.42Y 57.47 ± 12.30Y
3 11.96 8082.30 0.85 ± 0.73 2.01 ± 1.07 1.08 ± 0.03 0.0004 ± 0.0003A 0.0164 ± 0.0019B 0.0155 ± 0.0019B 1733.32 ± 4.35X 42.70 ± 5.10Y 45.32 ± 5.91Y
4 15.70 11,488.86 0.15 ± 0.08α 2.08 ± 0.05β 2.39 ± 0.03β 0.0005 ± 0.0004A 0.0168 ± 0.0010B 0.0156 ± 0.0014B 1386.78 ± 8.15X 41.39 ± 2.59Y 44.66 ± 4.27Y
5 9.34 13,516.02 0α 2.74 ± 0.10β 2.76 ± 0.13β 0A 0.0175 ± 0.0005B 0.0184 ± 0.0005B X 39.73 ± 1.15Y 37.78 ± 1.03Y
6 8.83 15,431.23 0.20 ± 0.07α 3.09 ± 0.11β 3.50 ± 0.13γ 0.0006 ± 0.0005A 0.0157 ± 0.0006B 0.0169 ± 0.0007B 1155.24 ± 11.65X 44.11 ± 1.69Y 41.02 ± 1.74Y
7 15.24 18,739.35 0α 3.24 ± 0.09β 3.71 ± 0.09γ 0A 0.0142 ± 0.0006B 0.0153 ± 0.0005B X 48.97 ± 2.07Y 45.38 ± 1.56Y
8 15.94 22,199.11 0.20 ± 0.13α 3.00 ± 0.07β 3.66 ± 0.07γ 0.0002 ± 0.0001A 0.0129 ± 0.0005B 0.0138 ± 0.0005B 3465.22 ± 6.45X 53.88 ± 2.13Y 50.40 ± 1.96Y
9 7.57 23,842.39 0.12 ± 0.09α 3.08 ± 0.06β 3.98 ± 0.06γ 0.0002 ± 0.0001A 0.0120 ± 0.0007B 0.0126 ± 0.0005B 3465.22 ± 6.45X 57.97 ± 3.30Y 55.26 ± 1.94Y
10 14.93 27,083.19 0.20 ± 0.06α 2.79 ± 0.04β 4.08 ± 0.04γ 0.0005 ± 0.0004A 0.0106 ± 0.0006B 0.0118 ± 0.0004B 1386.78 ± 8.15X 65.56 ± 3.53Y 58.75 ± 2.22Y
11 12.61 29,819.60 0α 2.58 ± 0.08β 4.27 ± 0.07γ 0A 0.0094 ± 0.0003B 0.0112 ± 0.0003C X 73.44 ± 2.11Y 62.05 ± 1.93Z
12 11.27 32,265.64 0α 2.42 ± 0.01β 4.61 ± 0.07γ 0A 0.0085 ± 0.0003B 0.0107 ± 0.0003C X 82.07 ± 2.55Y 64.77 ± 1.95Z
13 8.80 34,175.72 0α 2.31 ± 0.01β 4.51 ± 0.03γ 0A 0.0081 ± 0.0003B 0.0100 ± 0.0003C X 86.13 ± 3.09Y 69.49 ± 2.33Z
14 9.25 36,183.65 0α 2.15 ± 0.05β 4.61 ± 0.04γ 0A 0.0076 ± 0.0004B 0.0095 ± 0.0003C X 91.92 ± 4.59Y 73.22 ± 2.26Z
15 7.66 37,846.13 0α 2.07 ± 0.01β 4.46 ± 0.02γ 0A 0.0070 ± 0.0003B 0.0089 ± 0.0003C X 98.88 ± 3.75Y 78.20 ± 2.41Z
16 13.43 40,760.84 0α 1.86 ± 0.04β 4.18 ± 0.05γ 0A 0.0062 ± 0.0002B 0.0083 ± 0.0002C X 112.41 ± 3.88Y 83.21 ± 2.46Z
17 14.25 43,854.07 0α 1.76 ± 0.02β 4.48 ± 0.06γ 0A 0.0060 ± 0.0002B 0.0082 ± 0.0002C X 116.65 ± 4.75Y 85.08 ± 2.37Z
18 6.99 45,371.90 0α 1.68 ± 0.01β 4.55 ± 0.05γ 0A 0.0057 ± 0.0003B 0.0078 ± 0.0002C X 122.87 ± 6.44Y 88.88 ± 2.53Z
  1. Data were expressed as Mean ± SD (n = 3). αβγ, ABC and XYZ show significant differences among control and different concentrations of sodium bicarbonate treatments under the same cultivation day (one-way ANOVA; Tukey multiple comparison; p < 0.05)
  2. aTPAR, received total PAR mole per square meter per day
  3. bAPARE, accumulated total PAR energy per square meter with day
  4. cControl, culture without adding sodium bicarbonate (0.00 mol L−1)
  5. dTreatment 1, culture adding 0.02 mol L−1 sodium bicarbonate
  6. eTreatment 2, culture adding 0.10 mol L−1 sodium bicarbonate
  7. f0, indicating that no photosynthetic efficiency or specific growth rate was found under specific cultivation day
  8. g∞, indicating that doubling time tended to infinity under specific cultivation day