Abstract
The goal of this study was to assess the rate of urea nitrogen uptake (ρ) by Oocystis borgei and the relationship between environmental factors and ρ. Light intensity, temperature, pH, salinity, and algal concentration, were used to construct an empirical model. The results showed that light intensity, algal concentration, pH and salinity had significant effects on ρ, and the optimal combination of environmental conditions for ρ was a temperature of 25°C, pH of 7.0, light intensity of 81 µmol m−2 s−1, salinity of 15‰, and algal concentration of 4.5 × 108 cell L−1–5.5 × 108 cell L−1. The model equation was ρ = 2 × 10−5 × (A0.363B0.783C0.045D−0.503E) + 0.0017, with a coefficient of determination (R2) of 0.83. No significant difference in variance was observed between the model-predicted values and the measured values (F = 0.238, p > 0.05), which demonstrated the high fitting degree of the simulation equation. This study provided valuable insight into the reduction of urea nitrogen levels in aquaculture water by O. borgei.
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Acknowledgements
This study was supported by the Research and Demonstration of Key Technologies in The Industrialization of Active Microalgae Products (KY 20180112), which is funded by Shenzhen Dapeng New Area industry Development Special, and also supported by the Future Industrial Development Project Foundation of Shenzhen (JCYJ 20170413111950426), which is funded by the Shenzhen Science and Technology Innovation Commission.
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Liu, M., Huang, X., Zhang, R. et al. Uptake of Urea Nitrogen by Oocystis borgei in Prawn (Litopenaeus vannamei) Aquaculture Ponds. Bull Environ Contam Toxicol 101, 586–591 (2018). https://doi.org/10.1007/s00128-018-2450-1
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DOI: https://doi.org/10.1007/s00128-018-2450-1