Enhanced Biodecolorization Performance of Azo Dyes Under High-Salt Conditions by a Marine Microbial Community Exposed to Moderate-Intensity Static Magnetic Field

Abstract Effects of moderate-intensity static magnetic field (SMF) on biodecolorization of azo dyes by a marine microbial community (MMC) and halotolerance of the consortium were investigated. Performance of decolorization, chemical oxygen demand (COD) removal, detoxification, and biomass multiplication exposed to SMF of different intensities were monitored and compared. In addition, effects of SMF on microbial community structure were analyzed using a high-throughput sequencing technique. Results showed that compared with those with the MMC without SMF, efficiencies of decolorization, COD removal, and detoxification were higher when exposed to 45.3 mT SMF; however, they were lower when exposed to 95.0 and 249.5 mT SMF. By contrast, biomass multiplication was enhanced by all the three tested SMFs. On the contrary, 45.3 mT SMF also enhanced halotolerance of the MMC. Results of MiSeq sequencing demonstrated that 45.3 mT SMF influenced biodiversity and structure of the MMC, and the relative abundance of some...