Relative sludge specific resistance refers to the resistance of filter cake per unit filtration area per unit dry weight under a certain pressure, which is widely used to measure sludge dewatering performance. The lower the resistance ratio, the better the dewatering performance of sludge. With the increase of anionic polyacrylamide dosage, the specific resistance of sludge decreases first and then increases. When the amount of anionic polyacrylamide is between 50 and 75mg·L-1, the specific resistance is 2.88×1012 ~ 3.74×1012m·kg-1, which is lower than that without PAM.
According to the settlement performance test, the particles of the sludge flocculate after PAM conditioning are small, which is easy to enter the pores of the filter paper and cause blockage, thus increasing the specific resistance of the sludge. The sludge floc particles are larger, good permeability, not easy to plug the filter media pores, can effectively reduce the specific resistance of sludge. From the change of specific resistance of sludge, PAM with a molecular weight of 8 million and a hydrolysis degree of 20% had a better sludge conditioning effect, followed by PAM with a molecular weight of 6 million and a hydrolysis degree of 30%, and the dosage was still 75mg·L-1.
Basically all chemical raw materials will produce different effects in different environments, so it is necessary to determine the ratio of anionic polyacrylamide according to the actual operation, so as to play a better role.
Polyacrylamide (PAM) is a linear polymer, chemical formula is (C3H5NO) N. It is a hard glassy solid at room temperature. The products are liquid glue, latex and white powder particles, translucent beads and flakes. Good thermal stability. Can be dissolved in water in any proportion, aqueous solution is uniform transparent liquid. After long-term storage, the solution viscosity will decrease due to slow degradation of polymer, especially when the storage conditions are poor.  Polyacrylamide, as lubricant, suspension agent, clay stabilizer, oil displacement agent, water loss reducer and thickener, has been widely used in drilling, acidification, fracturing, water plugging, cementing and secondary oil recovery, tertiary oil recovery. It is a very important oil field chemical.Learn more
Polyferric sulfate is a kind of inorganic polymer coagulant with superior performance. It is a light yellow amorphous powdery solid and easily soluble in water. 10% (mass) aqueous solution is red-brown transparent solution and hygroscopic. Polyferric sulfate is widely used in drinking water, industrial water, all kinds of industrial waste water, municipal sewage, sludge dewatering purification treatment.Learn more