In fact, in the treatment of sewage, some sewage, the use of a single flocculant can not achieve the effect, you must use a combination of two, using inorganic flocculant PAC and polyacrylamide composite flocculant to treat sewage will achieve better Effect, but pay attention to the order when adding the medicament, the order is not correct, and the effect cannot be achieved.
Sequential method of adding polyacrylamide and other flocculants:
When using the composite flocculant, you must pay attention to the order of addition and the time interval of addition! The combined use of PAC and PAM is to allow PAC to complete the neutralization charge / colloids destabilization to form fine flocs, and then further increase the volume of flocs to facilitate full precipitation. Since the reaction time of polyaluminum chloride PAC is very short, it needs strong mixing after addition, and the PAM action time is long. Mixing should be strong first and then weak-the strong first is for uniform mixing and then weak to avoid damage to the flocs! Polyacrylamide is a flocculant, and polyaluminum chloride is a coagulant. Generally, the coagulant is added before polyacrylamide, but for safety reasons, it is recommended that you determine the order of addition through the experimental effect! Dosing point, dosing amount, dosing time and mixing intensity need to be determined by experiment. Remember that they must not be used together, otherwise it will affect the effect and increase the cost of use.
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