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Polyacrylamide classification polyacrylamide product introduction: polyacrylamide (PAM) is a water-soluble polymer, insoluble in most organic solvents, has good flocculation, can reduce the friction resistance between the liquid, according to the ionic characteristics can be divided into non-ionic, anion, cation and amphoteric type four types.

Cationic polyacrylamide use precautions:

1, the size of flocs: flocs too small will affect the speed of drainage, flocs too large so that flocs bind more water and reduce the mud biscuit degree. By choosing the molecular weight of polyacrylamide can adjust the size of the floc.

2, sludge characteristics. The first point is to understand the source, characteristics and composition of the sludge, the proportion. According to different properties, sludge can be divided into organic and inorganic sludge. Cationic polyacrylamide is used for the disposal of organic sludge, relative anionic polyacrylamide flocculant for inorganic sludge, strong alkaline with cationic polyacrylamide, and strong acid should not be used anionic polyacrylamide, high solid content of sludge usually polyacrylamide dosage is also large.

3, flocs strength: flocs should be stable and not broken under shear action. Improving the molecular weight of polyacrylamide or choosing suitable molecular structure can improve the stability of the flocculation.

4, polyacrylamide ionic degree: for dehydrated sludge, can use different ionic degree of flocculant after doing the first test stop selection, select the best suitable polyacrylamide, so that can get the best flocculant effect, and can make the dosage of the least, save money.

5, the dissolution of polyacrylamide: good solubility can give full play to flocculation. Sometimes the need to accelerate the dissolution rate, then you can think of improving the concentration of polyacrylamide solution.

Can polyacrylamide and polyaluminium chloride be used together?

In sewage at ordinary times, some of the sewage, use a single a flocculant is short of effect, must be used two kinds of combination, in the use of inorganic flocculant PAC and PAM composite flocculant sewage can achieve better effect, but reagent addition to pay attention to order, order is not correct, is also to reach the effect.

Mixed use of polyacrylamide and other flocculants adding sequence method:

In the use of composite flocculant must pay attention to the order of adding and adding time interval! The combined use of PAC and PAM is to make PAC complete the neutralization charge/colloid destabilization to form fine flocs, and further increase the volume of flocs is conducive to full precipitation. Because PAC reaction time is very short, so after joining the need for strong mixing, PAM action time to be long, mixing attention to the first strong after weak - first strong is to mix evenly after weak is to avoid damage to the flocs! Polyacrylamide belongs to the flocculant, polyaluminum chloride belongs to the coagulant, under normal circumstances is the first coagulant and then polyacrylamide, but for the sake of insurance, or suggest that we through the experimental effect to determine the order of addition! Dosing point, dosing amount, dosing time and mixing strength need to be determined by experiment. It is important to remember that the two agents should not be used together, otherwise the effect will be affected and the cost will be increased.

Product features

1, flocculation: PAM can make suspended material through electric neutralization, bridge adsorption, flocculation.

2, adhesion: through mechanical, physical, chemical action, play the role of adhesion.

3, resistance reduction: PAM can effectively reduce fluid friction resistance, adding trace PAM in water can reduce resistance by 50-80%.

4, thickening: PAM in neutral and acid conditions have thickening effect, when the PH value of PAM is more than 10 easy hydrolysis. Thickening will be more pronounced with a semi-reticular structure.

Action principle

1) flocculation principle: PAM is used for flocculation, and the surface properties of the species to be flocculated, especially the electrodynamic potential, viscosity, turbidity and the PH value of the suspension, the electrodynamic potential on the surface of the particles, is the reason for particle resistance to polymerization, adding the opposite surface charge of PAM, can reduce the electrodynamic potential and condensation.

2) adsorption bridge: PAM molecular chain is fixed on the surface of different particles, the formation of polymer bridge between the particles, so that the particles form aggregates and settlement.

3) surface adsorption: various adsorption of polar group particles on PAM molecules.

4) Strengthening effect: PAM molecular chain and dispersed phase through a variety of mechanical, physical, chemical and other effects, the dispersed phase implicated together, forming a network.