Enhancement of simultaneous algicidal and denitrification of immobilized Acinetobacter sp. J25 with magnetic Fe 3 O 4 nanoparticles

Abstract

In this study, immobilization technique was employed to improve simultaneous algicidal and denitrification of immobilized Acinetobacter sp. J25 with magnetic Fe₃O₄ in eutrophic landscape water. After 7 days of operation, the maximum superoxide dismutase (SOD) activity (54.43 U mg⁻¹), nitrate removal efficiency (100% (0.2127 mg L⁻¹ h⁻¹)), and chlorophyll-a removal efficiency (89.71%) were obtained from the immobilized J25 with magnetic Fe₃O₄. The results suggest that immobilized J25 with magnetic Fe₃O₄ had better nitrogen removal efficiency and algicidal activity in eutrophic landscape water. High-throughput sequencing data profiled the strain J25 that was immobilized with magnetic Fe₃O₄ which changed the composition of the microbial community. The results indicated a novel concept of enhancing the algicidal and denitrification property of immobilized bacteria with magnetic Fe₃O₄ in eutrophic landscape water.

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