Enhancement of Spirulina biomass production and cadmium biosorption using combined static magnetic field
2018
Shao, Weilan | Ebaid, Reham | Abomohra, Abd El-Fatah | Shahen, Mohamed
The effect of static magnetic field (SMF) on Spirulina platensis growth and its influence on cadmium ions (Cd²⁺) removal efficiency were studied. Application of 6 h day⁻¹ SMF resulted in the highest significant biomass productivity of 0.198 g L⁻¹ day⁻¹. However, 10 and 15 mg L⁻¹ of Cd²⁺ resulted in significant reduction in biomass productivity by 8.8 and 12.5%, respectively, below the control. Combined SMF showed 30.1% significant increase in biomass productivity over the control. On the other hand, increase of initial Cd²⁺ concentration resulted in significant reduction of Cd²⁺ removal efficiency, representing 79.7% and 61.5% at 10 and 15 mg L⁻¹, respectively, after 16 days. Interestingly, application of SMF for 6 h day⁻¹ enhanced Cd²⁺ removal efficiency counted by 91.4% and 82.3% after 20 days for cultures with initial Cd²⁺ concentration of 10 and 15 mg L⁻¹, representing increase by 6.3 and 25.3%, respectively, over the SMF-untreated cultures.
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