Cationic polyacrylamide coagulant can not be directly used in the process of sewage. Before use, cationic polyacrylamide must be fully dissolved in water, and then the aqueous solution must be used to treat the sewage. The water of granular polymer should be clean, not sewage, and tap water at room temperature can be used.
Generally speaking, heating is not required to promote dissolution. If the water temperature is lower than 5 ℃, the dissolution rate is very slow, and increasing the water temperature can make the dissolution rate faster. However, the temperature above 40 ℃ will accelerate the degradation of cationic polyacrylamide polymer, which will affect its application effect. Generally speaking, tap water is used to prepare polymer solutions. Some acid-base solutions or water-containing salt components are not suitable for preparing cationic pam solutions. Next, let's talk about what to pay attention to in the process of using cationic polyacrylamide.
Cationic polyacrylamide cannot be in direct contact with iron. The presence of iron ions will degrade the molecular chain of cationic pam, and the concentration of polymer solution is generally 0.1% ~ 0.3%, that is, one gram to three grams of cationic pam powder can be added to one liter of tap water. The daily dosage is determined according to the size of the configuration tank. The concentration can be higher. When the concentration of cationic pam is relatively high, it can be diluted. Put the cationic polyacrylamide solution into the sewage. If the dispersion is not very good due to the equipment, it can be diluted during configuration. In a word, if the concentration of the solution is too high, the load of the agitator motor will be too large. At the same time, it will not disperse well after entering the sewage, which will affect its use effect. If it is diluted a little, it will help to improve the speed and effect of use.
If the floc is too small, it will affect the drainage speed. If the floc is too large, it will restrict more water and reduce the degree of mud biscuit. After selection, the molecular weight of polyacrylamide can adjust the size of floc. According to the characteristics, composition, proportion and properties of sludge, sludge can be divided into organic and inorganic sludge. Cationic polyacrylamide is used to dispose organic sludge. Cationic polyacrylamide is used when the alkalinity is very strong, while anionic polyacrylamide is not suitable when the acidity is very strong. When the solid content is high, the amount of polyacrylamide is usually large.