A cationic polymeric flocculant was chosen becasue its hydrolysate with positive ammonium group enhanced the adsorption of residual COD and improved the flocculation efficiency.

• 选择阳离子高分子絮凝剂，由于其水解产物带有正电荷铵盐基团，加强了残存COD的吸附，完善了絮凝分离过程。