Abstract
Two inorganic polymer coagulants, polyferric silicate sulphate (PFSS) and polyferric sulphate (PFS), were comparatively evaluated in the Yellow River water treatment. The removal efficiency of turbidity and UV254 were investigated, and the zeta potential was measured. An online laser scatter instrument was used to determine the size distribution of flocs formed in the coagulation processes. Compared with PFS, PFSS forms flocs with higher growth rates and larger sizes. The formed flocs were exposed to a series of shear forces, and the floc strength was measured from the relationship between the applied shear speed and the resulting floc size. The flocs formed by PFSS had a higher strength. The floc breakage (expressed as breakage factor, Bf) and re-growth ability (expressed as breakage factor, Rf) under different shear forces and different shear periods were investigated, and it was found that larger Bf and Rf appeared after exposure to stronger shear force and longer shear period. Under the same shear condition, the flocs formed by PFSS showed a larger Bf while the flocs formed by PFS had better re-growth ability.
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