When using a composite flocculant, attention must be paid to the order of addition and the time interval between additions. The combination of PAC and PAM is to let the PAC complete the neutralization charge/colloid destabilization to form fine flocs, and further increase the floc volume to facilitate sufficient precipitation. Since the reaction time of the polyaluminum chloride PAC is very short, strong mixing is required after the addition, the PAM action time is long, and the mixing attention is strong first and then weakly – the first strong is to mix evenly and weakly to avoid breaking the flocs. Polyacrylamide is a flocculant, and polyaluminum chloride is a coagulant. In general, a coagulant is added followed by polyacrylamide. However, for the sake of safety, it is recommended that the order of addition be determined by experimental results. Dosing point, dosing amount, dosing time and mixing intensity need to be determined experimentally. Remember to never use them together, otherwise it will affect the effect and increase the cost of use.
Post time: Sep-06-2019