Reasons Why Polyacrylamide Has Poor Flocculation Effect

The reason why polyacrylamide has poor flocculation effect is that polyacrylamide flocculant is often used to treat wastewater due to its adsorption bridge function; but sometimes the flocculation effect is not obvious, and polyacrylamide cannot flocculate, which means it fails. The reasons and factors What are the main ones?

On the one hand, the direct factor is temperature. When the temperature of the sewage is low, the flocculation effect of polyacrylamide will be poor, because at low temperatures, flocculation is very slow, making hydrolysis more difficult; when the water temperature is low, the water viscosity is high, and the thermal movement of impurities in the sewage is reduced. Slow, the chances of collision with each other are reduced, which is not conducive to mutual cohesion; the water viscosity of sewage is large, the shear force of the water flow increases, and the flocculation will be very slow.

The second is the pH value of sewage. The PH value of sewage has a greater impact on polyacrylamide. Different ionic polyacrylamides have different requirements for PH value. The flocculant effect is better in a neutral environment. If the PH value is too high or too low, polyacrylamide will be damaged. Invalid.

Then comes on-site use. When using and storing polyacrylamide on site, you need to follow the methods given by the manufacturer. Products produced by different manufacturers have differences in performance. Without adjustments, polyacrylamide will not be able to exert a good flocculation effect. The amount of addition will increase, thus showing partial failure. In addition, when dissolving polyacrylamide, dissolution time, stirring speed, etc. will all have a certain impact.

In general, there are many factors that lead to the failure of polyacrylamide flocculants, not only the above points, but also closely related to the type, quality, dosage, uniformity of polyacrylamide when added, and the speed of mixing. relation.