Cationic polyacrylamide (CPAM) is a linear polymer compound, because it has a variety of active groups, which can be bonded with many substances and adsorbed to form hydrogen bonds. Mainly flocculation negatively charged colloid, except the turbidity, decoloring, adsorption, adhesion, and other functions, suitable for dyeing, papermaking, food, building, metallurgy, mineral processing, coal, oil field, aquatic products processing and fermentation industries such as waste water treatment of organic colloid content is higher, especially suitable for urban sewage, urban sewage sludge, sludge and other industrial sludge dewatering treatment.
feature
1. Water solubility is good and can be completely dissolved in cold water.
2. Adding a small amount of cationic polyacrylamide products can be greatly flocculated. Generally, only 0.01~10 PPM (0.01 ~ 10g/m3) can be added to the full play.
3. The use of cationic polyacrylamide products and inorganic flocculants (polymerization of ferric sulfate, aluminum chloride, iron salts, etc.) can show a greater effect.
Degree of hydrolysis
Degree of hydrolysis polyacrylamide refers to the weak ion polyacrylamide solution combined with water, the formation of weak alkaline or the ability of weak acid, or is formed in the PAM aqueous solution of the strength of weak acid and weak base ability strong or weak. For strong acids and strong bases, the greater the ionization degree, the stronger the acidity, and the weaker the degree of hydrolysis. For some soluble polyacrylamide, the greater the ionization degree, the less the degree of hydrolysis. In general, the degree of dissociation is greater, and the degree of hydrolysis is much smaller.
Product performance
1. PAM has unique decolorizing ability, which is mainly used in the decolorization of high chromaticity wastewater in the dye plant. The suitable dye varieties are active, acidic and disperse dyes.
2. It can also be used in the treatment of industrial waste water such as textiles, printing and dyeing and printing ink.
3. The decolorization rate of the product can reach over 95%, and the removal rate of COD is between 40 and 70 %.
Guide book
1) polyacrylamide is organic polymer compound, can be divided into anionic polyacrylamide, cationic polyacrylamide and nonionic polyacrylamide, as the white powder or granule, soluble in water, but slower to dissolve;
2) anionic polyacrylamide is generally used in wastewater treatment flocculant, and cationic type is commonly used in sludge dewatering.
3) as a flocculant, the dosage is usually 1-2ppm, that is, the amount of water used for each treatment of 1 ton of wastewater is about 1-2g.
4) when used, the anionic type is normally prepared with a water solution of about 0.1 percent, and the cationic type can be made up to 0.1-0.5 percent.
5) solutions should be in the dissolving tank water first, then open the blender, then PAM along the spiral slowly add, PAM cannot one-time input quickly, otherwise the PAM will agglomerate to form "fish eye" and cannot be dissolved;
6) after adding PAM, it should continue to stir for more than 30min to ensure its full dissolution;
7) the dissolved PAM should be used as soon as possible, the anionic type is generally not more than 36h, and the cationic type dissolves easily and should be used within 24h.
Technical process
The precipitate is the material that does not dissolve in the solution of the reactant when the chemical reaction occurs. The meaning of the word is that the precipitation is removed under the action of gravity. The suspended matter in sewage can be a physical process, easy to use, good effect, and is one of the important technologies of sewage treatment.
According to the properties of suspended matter, concentration and polypropylene amide properties, precipitation can be divided into: natural precipitation, flocculation precipitation, regional precipitation. Regional precipitation suspended cry higher levels (above 5000 mg/L), the settlement of particles affected by other particles around, maintain invariable relative positions between particles, forming a whole sink together, with a clear mud interface between clear water. Regional precipitation occurred in the secondary sedimentation tank and the sludge concentration pool.
The suspended solid concentration in wastewater is not high, and it has no cohesive properties. In the precipitation process, the solid particles do not change the shape, nor do they stick to each other, and the precipitation process can be completed independently. (at the beginning of grit chamber and the early stages of the pond, precipitation) compression precipitation occurred in the process of the settlement of high concentration of suspended particles, because of the high concentration of suspended particles, particles has integrated mass structure between each other, touch each other, support each other, the lower water between particles in the upper particles under the action of gravity by extrusion, concentrated sludge. The enrichment process of polyacrylamide in the disin-sink sludge hopper and the condensation of sludge in the concentrated tank are compressed. Free precipitation occurs in the water suspended solid concentration is not high, the precipitation process suspended solids do not interfere with each other, the particles separately carry out precipitation, the precipitation trajectory of particles is in a straight line. The physical properties of the particles, such as shape, size and proportion, are not changed in the process of precipitation. The precipitate in the sink is free precipitation.
Flocculation precipitation is the process of flocculation precipitation in the water. After dosing coagulant in water, including suspension colloid and dispersed particles in molecular force generated under the interaction of flocculent body and they collided with each other in the process of subsidence condensation, its size and quality constantly, sinking speed increasing. The removal rate of suspended objects depends not only on the precipitation velocity, but also on the depth of precipitation. The alum flowers formed by the coagulation agent in the surface water and the organic suspended solids in the sewage are the phenomenon of flocculation in the precipitation process.