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| Effects of different nitrogen concentrations on growth and chemical composition of a freshwater microalgaScenedesmus obliqnus |
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| DOI：10.16768/j.issn.1004-874X.2018.01.011 |
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| Abstract: |
| An experiment was carried out to evaluate the effects of different nitrogen concentrations on growth
and chemical composition of a freshwater microalga Scenedesmus obliqnus. In this study，the culture solutions were
designated with seven nitrogen concentrations，which were 0.247 mg/L，2.47 mg/L，24.7 mg/L，123.5 mg/L，247
mg/L，370.5 mg/L and 740 mg/L，respectively. The results showed that different initial nitrogen concentrations
had significant effects on the growth and the nitrogen and phosphorus contents of S. obliqnus（ P<0.05）. The
growth rate of algae increased with the nitrogen concentrations of nutrients increasing，peaking at the 247mg/L of
nitrogen concentration and decreasing thereafter. Therefore，the nitrogen concentration of 247 mg/L is the saturation
concentration for the growth of S. obliqnus. When the nitrogen concentration was 0.247～24.7 mg/L，the N content
of unit algae volume（ mg/L） increased with the increase of nitrogen concentration of nutrients，but as the nitrogen concentration continued to increase，the N content of algae had no significant difference. With the increase of nitrogen
concentration of nutrients，the P content of unit algae volume（ mg/L） increased and then decreased，the P content of
cell（ mg/cell） declined sharply. Therefore，the high nitrogen concentration in surrounding environment would inhibit
the production of algal phosphorus composition. |
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