Effect of synthetic cationic surfactants on dewaterability and settleabihty of activated sludge

摘要

Dimcric cationic surfactants with different lengths of carbon chains were synthesised, and then these surfactants were added to the activated sludge samples to evaluate the dewaterability and settleabihty. The adsorbability of cationic surfactants on activated sludge was also studied. By comparing the dewatering performances of different cationic surfactants, the effect mechanisms of cationic surfactant are elucidated. The dimeric cationic surfactants can not significantly improve the filtration performance of activated sludge, however, they can apparently decrease the moisture content in filtration cake and bound water content.