| With the development of galvanization, tannage, antisepsis, and dye etc, people's body and environment had been damaged badly by metal-bearing wastewater, so it has been the urgent assignment to wipe off heavy metal ion effectively. In this paper, a novel magnetotactic complex technology to dispose wastewater containing heavy metal ion was put forward. And it was studied deeply in sides of continuous working conditions, treating result and working mechanism.In this paper, first, the mixed bacteria were domesticated, trained and selected. Then, the components of the mixed bacteria were studied carefully. It was found that there are 9 kinds of bacteria. Among them, 7 are gram-negative bacteria and 2 are gram-positive bacterium. Some characters had been determined.On the same time, different kinds of heavy metal ions had been absorbed under static situation. As the result, the kinds of heavy metal ions that were suit for being treated by magnetotactic bacteria were determined. Then, the operation situation had been studied so that the dynamic experiments' operation situation could be offered. The experiments showed: some magnetic metal ion, such as iron(II), chromium(III), nickel(II), were suit for being treated by magnetotactic bacteria.Through the study of microbe' absorbing heavy metal ions with magnetic technical treatment, it was found that the microbe' absorption was affected greatly by pH value and there was an optimum pH value scope. And the optimum scopes of different ions had different ones. The absorption was mainly on the surface of the microbe so it could reach the absorption equilibrium soon. The absorption was also affected by temperature, but, the effect was small.Lastly, under the optimum operation situation, with composite technical flow treating heavy metal ions wastewater, it was found that the outlet heavy metal ion concentration was far blow the outlet standard.
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