Papers by Keyword: Composite Flocculant

Abstract: The dewatering effects of FeCl₃, AlCl₃ and PAM as flocculants for substrate sludge in Poyang Lake of SCAU were tested. The indexes, such as the filtrating volume, the moisture content, etc, were compared in order to achieve the best composite flocculant. The results showed that, when FeCl₃ was used with PAM in the ratio of 4:1, the highest filtrate volume 75mL was obtained. At the same time, when the dosing quantity is 3%, we obtained the best dewatering performances, such as the fastest velocity of filtrate, the highest degree of clarity with 88%, which were better than other flocculants.

Abstract: A new composite coagulant, polymeric ferric aluminum chloride-polydimethyl diallylammonium chloride (PFAC-PD), was prepared by combing Polymeric ferric aluminum chloride (PFAC) with polydimethyl diallylammonium chloride (PDMDAAC). The turbidity, ultraviolet absorbance at 254 nm (UV254) and specific ultraviolet absorbance (SUVA) removal and flocculating mechanisms of the new composite coagulant and the traditional coagulants (PFAC, adding PFAC before adding PDMDAAC and adding PFAC after adding PDMDAAC) were investigated in treating surface water. The results indicated that the new composite coagulants exhibited better flocculation efficiency than PFAC and successive addition of PFAC and PDMDAAC. The neutralization ability of the coagulants was in the following order: PFAC-PD > PD+PFAC > PFAC+PD > PFAC.