Introduction of action principle of polyacrylamide
Everyone knows that polyacrylamide is a linear polymer, with good flocculation, adhesion, resistance reduction, thickening and other effects. So what is the principle of polyacrylamide PAM as a flocculant? Here is the explanation for you.
Polyacrylamide as the effect of flocculant, now most people believe that its role is the process of adsorption bridging, flocculation precipitation, and then detailed said it is can be divided into coagulation, flocculation, sedimentation three stages, both in the laboratory experiment and computer operating the three stages can be fully shows that the selected product if applicable.
1. Condensation stage
When we add PAM liquid medicine, it is a process in which the liquid medicine is injected into the coagulation tank and the raw water is coagulated quickly to form micro-alum flowers in a very short time. At this time, the water becomes more turbid, which requires the water flow to produce intense turbulence. Beaker experiment should be fast (250-300 RPM) stirring 10-30s, generally not more than 2min. This time the effect is very good.
2. flocculation stage
It is the process of growth and thickening of alum flowers, which requires proper turbulence degree and sufficient residence time (10-15min). In the late stage, a large number of alum flowers can be observed to gather and slowly sink, forming a clear surface layer. Beaker test: Stir at 150 RPM for about 6 minutes and 60 RPM for about 4 minutes until suspended. Check how it reacts and adjust if it doesn't work.
Domestic sewage and organic wastewater treatment, the product in the compatibility or alkaline medium are positive, so the sewage suspended particles with negative charge for flocculation precipitation. It was conducted in the sedimentation pond, flocculating settling process required flow is slow, inclined tube (plate) commonly used to improve the efficiency of sedimentation pool (in air flotation separation of floc), a large number of bulky alum flowers inclined tube (plate) wall block and deposit on the bottom, the upper water as clear water, the rest of the small particle size and density of small alum flowers side slowly down, side to continue to collide with each other ", The residual turbidity remained unchanged until the late stage.
polyacrylamide,anionic polyacrylamide,cationic polyacrylamide,nonionic polyacrylamide,flocculant,polymer,PAM.