Mechanism Study on Flocculating Organnic Pollutants By Chitosan with Different Molecular In Wastewater

This paper presents the effect of the molecular weight of chitosan on flocculation of simulation sewage. The flocculation process of different chitosan samples were analyzed in different deacetylation degree, dosage and pH. The different molecular weight of chitosan samples and simulation sewage were all laboratories homemade. The flocculating effects of chitosan increases with the increase of deacetylation degree; the flocculating effects of chitosan decreases with the increase of viscosity-average molecular weight，the viscosity-average molecular weight in 8.5~68×104range. Some conclusions were different from classical theory, the higher molecular weight of chitosan, the better its precipitation effect is. This discovery of the phenomenon is important to perfect the existing polymer flocculation theory