Medium Optimisation for Improved Growth-Rate Inhibition of Microcystis Aeruginosa Exposed to AgBiO₃ Using Response-Surface Methodology

Abstract:

Blooms of the Microcystis aeruginosa in water have been a long-standing problem for water quality and a human-health issue. Public concern for the inhibition of Microcystis aeruginosa has become increasingly urgent. AgBiO₃ is an algaecide having good inhibitory effects on the growth of Microcystis aeruginosa with hydroxyl radicals generated by photocatalyst. The inhibition of Microcystis aeruginosa exposed to AgBiO₃ was optimised using statistically-based experimental designs. The four variables, namely, ZnSO₄, CaCl₂, CuSO₄ and NaNO₃, were screened as significant effects and were further optimised to determine the optimum levels and their interactions. The optimal concentrations of variables for maximum inhibition were 0.24 mg/L ZnSO₄, 125.94 mg/L CaCl₂, 0.28 mg/L CuSO₄ and 600 mg/L NaNO₃. The maximum inhibition rate predicted by the model was 61.86%, in near-perfect agreement with the experimental value (60.07%), and significantly better than unoptimised medium (42.79%).

• Periodical: Advanced Materials Research (Volumes 255-260)
• Pages: 2940-2948
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.255-260.2940
• Online since: May 2011
• Authors: Xiao Juan Yu, Jiang Ya Zhou, Zhi Ping Wang, Yang An, Wei Min Cai
• Keywords: Central Composite Design, Design Expert Software, Interaction, Plackett-Burman Design (PBD), Significant Effect

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