Keywords: dimeric cationic surfactants, sludge dewatering, dewaterability, activated sludge, settleability, adsorbability, EPS, extracellular polymeric substances, synthetic cationic surfactants, filtration performance, moisture content, waste sludge treatment
Effect of synthetic cationic surfactants on dewaterability and settleability of activated sludge
Dimeric 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 settleability. 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.