Growth and nutrient removal properties of a freshwater microalga Scenedesmus sp. LX1 under different kinds of nitrogen sources |
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| Authors: | Li Xin Hu Hong-ying Gan Ke Yang Jia |
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| Institution: | 1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;2. Department of Environmental Science and Engineering, School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;1. Laboratory for Leather and Environmental Studies (LACOURO), Chemical Engineering Post-graduated Program (PPGEQ), Federal University of Rio Grande do Sul (UFRGS), Av. Luiz Englert s/n°, Porto Alegre-RS, 90040-040, Brazil;2. Laboratory of Process Control and Integration (LACIP), Chemical Engineering Post-graduated Program (PPGEQ), Federal University of Rio Grande do Sul (UFRGS), Av. Luiz Englert s/n°, Porto Alegre-RS, 90040-040, Brazil;1. Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;3. Department of Biological Science and Biotechnology, Wuhan University of Technology, Wuhan 430070, China;1. KU Leuven Kulak, Laboratory Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium;2. KU Leuven, Department of Soil and Water Management, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium;1. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Road 693, Wuhan 430073, China;2. Alfa Laval Nakskov A/S, Stavangervej 10, DK-4900 Nakskov, Denmark |
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| Abstract: | Microalgae have received much attention for the inorganic nutrient removal in tertiary treatment of domestic wastewater. Effect of different kinds of nitrogen sources on the growth and nitrogen/phosphorus removal properties of a newly isolated freshwater microalga, Scenedesmus sp. LX1, from a low-nutrient environment condition was studied and reported in this paper. The order of specific growth rate of the microalga with different nitrogen sources was NH4-N > urea-N > NO3-N. With nitrate or urea as nitrogen source, the microalga could grow well and remove both nitrogen and phosphorus efficiently (90% nitrogen and nearly 100% phosphorus were removed). However, with ammonium as the nitrogen source, the maximum algal density was relatively low, and the nitrogen and phosphorus removal efficiencies were as low as 31.1% and 76.4%, respectively. This was caused by the inhibitory effect of algal culture's acid pH due to H+ releasing from NH4+ during algal cultivation process. |
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