Why should we add polyaluminum chloride to sewage air flotation?

2018-09-04

Why should we add polyaluminum chloride to sewage air flotation?

Why do you need to add polyaluminum chloride PAC before industrial wastewater treatment flocculation? The reason is that the particles in the sewage are small and suspended, and the polyaluminum chloride PAC is a dielectric type coagulant, which has strong demulsification ability and can condense the suspended matter in the sewage into fine flocs. If the polyacrylamide PAM flocculant is directly added, it is difficult to completely flocculate the suspended particles in the sewage, that is, the supernatant of the treated sewage is not clear enough.
Polyaluminum chloride PAC is generally called inorganic flocculant. Strictly speaking, PAC is not a flocculant but a coagulant. It is generally used in combination with polyacrylamide flocculant. Of course, some industries use PAC for simple sedimentation. However, industries that require other treatments such as sludge dewatering after flotation and flocculation and sedimentation require the use of novel PACs in conjunction with PAM.

It is no secret that the use of PAC and PAM when the air flotation and sedimentation treatment is carried out. Especially after the addition of PAC in the air flotation, the polyaluminum chloride is “pulled” together by micro-adsorption, and the particle volume becomes large. The float efficiency can be significantly improved.
In terms of cost, using PAC for microflocculation before adding polyacrylamide PAM can greatly reduce the dosage of PAM, and the price of PAC is much cheaper than PAM, and the flocculation effect is better than that of polyacrylamide alone. Significant improvement, so the sewage should be added with polyaluminum chloride before adding the polyacrylamide flocculant to the air flotation and flocculation precipitation treatment.

 


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