A novel technology for treatment of wastewater containing Cr(Ⅲ) ions
生物磁分离新技术处理含铬废水最佳条件的研究

Magnetotactic bacteria(MTB)-magnetic separation method was put forward for treatment of wastewater containing Cr(III). The effects of performance parameters such as pH, temperature, sorption duration and biomass concentration in the process of removing Cr(III) by MTB were investigated, and intensity of magnetic field and the place of wire casing were also analyzed. The experimental results indicated that pH value and concentration of biomass exerted important influence on the sorption process, and their optimum scopes were 5~11 and 4.0~10.0 g/L, respectively. No significant effect of temperature had been observed in the discussed range, and the process could be finished within 5 min. The separation efficiency was very good when magnetic field intensity was 100 Gauss, and no distinct improvement with higher magnetic field intensity. Moreover, the separation efficiency was better when metal wires were vertical than parallel with magnetic force line. At the same time, the wires loading MTB were magnified 5 000 times by scanning electron microscope (SEM).