The effect of high magnetic field characterized by kinetics: Enhancing the biodegradation of acid red 1 with a strain of Bacillus sp.

The induced strain HG1 exposed to 10.0 T high magnetic field for 30 min and the original strain G1 (Bacillus sp.) isolated from soil were used to degrade acid red 1. The degradation process of the azo dye by these microbes was approximated by a reversed S-like curve. A kinetics equation whose parameters reflected the degradation process, was then established. The comparison and analysis of the kinetics parameters showed that the high magnetic field enhanced the biodegradation ability of the exposed strain—increasing the value of A (degradation constant) and Vmax (maximum reaction rate) to 1.7 and 1.5 times, respectively, and at the same time, reducing the value of tc (time when the maximum reaction rate was reached) to 0.8 times. Additionally, the UV/vis spectra also showed that the degradation ability of Bacillus sp. was improved and the metabolic pathway of the bacteria might be changed after being exposed to the high magnetic field.