Sulfonation modified biological flocculant, preparing method and application thereof

The invention relates to the biological flocculant field, and specifically, relates to a sulfonation modified biological flocculant, a preparing method and application thereof. A sulfonation modified biological flocculant preparing method includes performing a sulfonation reaction on biological flocculant to obtain the sulfonation modified biological flocculant. The inventor further performs sulfonation modification on the biological flocculant obtained via fermentation, and discovers that the biological flocculant may contain, via the sulfonation modification, rich sulfonic groups, thereby improving the capability of the biological flocculant for absorbing heavy metal ions, and the effect is obvious. The invention further provides the application of the sulfonation modified biological flocculant in heavy metal waste water treatment, in particular, when the heavy metal ion concentration in the heavy metal waste water being less than 100 mg/L, and a heavy metal removal rate up to 80% or more. 本发明涉及生物絮凝剂领域，具体而言