What happens to the floc floating after the papermaking wastewater is added to PAC PAM? 5

The role of PAC is completed through the compression of electric double layer, electrical neutralization, coil net capture and adsorption bridging of its hydrolysate products, which can be precipitated and filtered out by the oxidant oxidation to cause COD, thereby reducing COD, the precipitation of particulate matter, undoubtedly reducing SS, the so-called BOD refers to the amount of oxygen required when the organic matter in the water is decomposed by aerobic microorganisms, which reflects the amount of organic matter that can be biodegraded in the water under aerobic conditions. If these organic matter are removed by precipitation, the BOD will be reduced. The PAM is a high-resolution flocculant, and the organic polymer flocculant has a huge surface adsorption effect caused by the formation of larger flocs between the particles. The principle of reducing the indicators in the water is the same as above.

I don't know what the specific situation is, whether it is a problem with the amount of PAM, I saw a problem on the environmental protection pass that if this situation still occurs after adjusting the dosage of polypropylene, then it is likely that the water contains sulfide and the generation of hydrogen sulfide, and the content of sulfide can be detected. In the case of sulfide, after adding polyiron, the stirring time should be extended appropriately, and then the polypropylene can be added, you can try it to see how the effect is.

Add some clarified lime water first, until the sewage is more alkaline, and then add PAC PAM

In water treatment, there is a certain limit to the dosage of PAC and PAM, the water quality will be turbid or yellowish after PAC is added, the floc is not obvious, and the floc will float or stand still when the dosage of PAM is too large, according to the situation you described, it should be caused by PAM overdose. Reducing the dosage should be no problem to try again!

The amount of PAC in domestic sewage treatment needs to be more determined by the concentration of sewage, and the simple test method is to observe the flocculation state of sewage after adding a quantitative amount of PAC, and the dosing flow rate should be maintained after the floc appears, and it should not be increased or decreased.

There are many people who say that the high molecular weight is less, and the low molecular weight is more, so it is unscientific to understand, and the high molecular weight of the PAM will be.

Very viscous, overly viscous PAM solution is particularly prone to clogging pipes. It is correct to select the appropriate molecular weight of pam in wastewater treatment.

In response to your question, it can be simply understood that the amount of PAM is small, the floc does not change much, and the precipitation speed will not be significantly accelerated, and the floc changes significantly when the dosage of PAM is too large, but the precipitation speed becomes worse or suspended, stationary or floating.