According to the degree of human intervention, the bioremediation could be divided into natural and
artificial bioremediation, and the latter could be divided into in-situ bioremediation and ex-situ
bioremediation. On the one hand, the in-situ bioremediation means to use bioremediation technology
directly in polluted rivers without any pollutant excavated and transported. In this process, indigenous
microbes which sometimes combine with domesticated microbes are used. In addition, it usually needs