Dissolution method of PAM
PAM is an organic polymer compound, and the molecular weight of most products is in the millions or even close to 20 million. Therefore, its method is very different from the method of dissolving small inorganic molecules with iron and aluminum salt coagulants. The principles are as follows:
1. Polyacrylamide flocculant cannot be directly discharged into sewage. It must be dissolved in water first and then precipitated.
2. The water should be clean water (such as tap water) containing soluble polymers. The water temperature is lower than 5°C and dissolves slowly. Dissolution speeds up when water temperature exceeds 40℃.
3. The concentration ratio of the polymer solution, our recommendation is 0.1% to 0.3%, that is, 1-3g of polymer powder is added to 1 liter of water. However, if the polymer concentration is too high, it will cause the mixer motor to be overloaded, and it will also cause the wastewater to be poorly dispersed, affecting the use effect.
4. Do not use a centrifugal pump to transfer into the solution to prevent the high-speed rotating blades from shearing and degrading the polymer.
The method is as follows: add a certain amount of water to the container, and calculate the amount and weight of the polymer based on the clean water and the required partial polymer concentration.
Turn on the electric stirrer to rotate the water to create a vortex to avoid degradation of the polymer, but the speed should not be too slow to prevent the polymer particles from floating on the water or sinking into the water and forming clumps.
Slowly pour the entire polymer into the water, making sure the polymers don’t stick to each other. In order to form a uniform, transparent, viscous solution without visible macromolecules, it needs to be stirred for a period of time to fully dissolve the polymer.
Iron ions are the catalyst of PAM. It is best to use stainless steel, plastic, and glass fiber to avoid iron ions entering the PAM solution.
