Abstract
Ammonia pollution occurs frequently in urban water networks, which threatens the safety of water supply systems. Zeolite can be
used for the removal of ammonium in the pretreatment of raw water for its peculiar adsorptive property to ammonium, but a large
amount of sludge from this measure could be a significant pollution source. In this work, the dewatering performance of
precipitated sludge from the pretreatment of micro-polluted raw water was studied. Batch experiments of the simulated
coagulation-sedimentation process were carried out, using powdered zeolite for pretreatment, in doses ranging between 0.20 -
0.65 g/L. It was found that all the specific resistances to sludge filtration were less than 0.50×109 s2/g, with descending trends as
the powdered zeolite dosage increased. The results show that the sludge resulted from the powdered zeolite strengthened
coagulation-sedimentation technology had improved dewatering performance and this facilitates its disposal.