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Three types of polyacrylamide (PAM) flocculants of cationic PAM WD4960, non-ionic PAM M351, and anionic PAM WDA110 had different performances on the Ferric hydroxide gel (FHG) dewaterability and that M351 was the best one. The optimum dosages of these PAMs did not completely depend on the FHG total suspended solid (TSS) content of 0.2–1.5g/L. The amount of PAM absorbed on the FHG surface linearly...
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