Polymeric ferric sulfate-carboxymethyl potato starch composite flocculant and preparation method and application thereof

The present invention relates to a PFS - carboxymethyl potato starch composite flocculant, the flocculant PFS composite made from potato starch and carboxymethylcellulose, wherein the mass of iron in the ferric sulfate carboxymethyl the ratio of starch-based potato quality 1:3 ~ 3:1. The invention also discloses a method of preparation and application of the flocculant in the COD of waste water treatment. The present invention introduces carboxymethyl potato starch in a composite coagulant PFS after first short inorganic coagulant can overcome the drawbacks of the molecular chain, and secondly avoid polyaluminum synthetic polymer flocculant in the flocculation process residue of harm, while its power play in the middle and ability, but also has a high-performance bridge, netting effect, can remove small particles to the waste water by volume, thereby improving removal efficiency.