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Int. J. Environ. Res. Public Health 2014, 11(6), 6099-6118; doi:10.3390/ijerph110606099

Biosorption of Strontium from Simulated Nuclear Wastewater by Scenedesmus spinosus under Culture Conditions: Adsorption and Bioaccumulation Processes and Models

1
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education of China, Southwest University of Science and Technology, Mianyang 621010, China
2
Life Science and Engineering College, Southwest University of Science and Technology, Mianyang 621010, China
3
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
4
National Defense Key Discipline Laboratory of the Nuclear Waste and Environmental Safety of the Commission of Science, Technology and Industry for National Defense, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
*
Authors to whom correspondence should be addressed.
Received: 31 March 2014 / Revised: 22 May 2014 / Accepted: 28 May 2014 / Published: 10 June 2014
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Abstract

Algae biosorption is an ideal wastewater treatment method when coupled with algae growth and biosorption. The adsorption and bioaccumulation of strontium from simulated nuclear wastewater by Scenedesmus spinosus were investigated in this research. One hundred mL of cultured S. spinosus cells with a dry weight of 1.0 mg in simulated nuclear wastewater were used to analyze the effects on S. spinosus cell growth as well as the adsorption and bioaccumulation characters under conditions of 25 ± 1 °C with approximately 3,000 lux illumination. The results showed that S. spinosus had a highly selective biosorption capacity for strontium, with a maximum bioremoval ratio of 76%. The adsorbed strontium ion on cell walls was approximately 90% of the total adsorbed amount; the bioaccumulation in the cytoplasm varied by approximately10%. The adsorption quantity could be described with an equilibrium isotherm. The pseudo-second-order kinetic model suggested that adsorption was the rate-limiting step of the biosorption process. A new bioaccumulation model with three parameters was proposed and could give a good fit with the experiment data. The results suggested that S. spinosus may be a potential biosorbent for the treatment of nuclear wastewater in culture conditions. View Full-Text
Keywords: Scenedesmus spinosus; biosorption; adsorption; bioaccumulation; strontium; kinetics model Scenedesmus spinosus; biosorption; adsorption; bioaccumulation; strontium; kinetics model
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MDPI and ACS Style

Liu, M.; Dong, F.; Kang, W.; Sun, S.; Wei, H.; Zhang, W.; Nie, X.; Guo, Y.; Huang, T.; Liu, Y. Biosorption of Strontium from Simulated Nuclear Wastewater by Scenedesmus spinosus under Culture Conditions: Adsorption and Bioaccumulation Processes and Models. Int. J. Environ. Res. Public Health 2014, 11, 6099-6118.

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