Microbial Flocculants is a kind of metabolic products with flocculating activity being produced by microbes and secreted outside of cells. It has the characteristics of easy degradability, highly efficiency, non-toxicity and non-secondary pollution. The flocculation mechanism of Microbial Flocculants is more complicated than the conventional flocculation theories. Through summarizing the relevant domestic and overseas research literatures published in the recent years, this paper has made a summarization and conclusion on the various flocculation theories of Microbial Flocculants in detail, and pointed out the existing problems in the present research and proposed an expectation on the development trend in the future.
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