We, SHH Chemicals which brand name called Chinafloc is a manufactory focus on polyacrylamide almost decade. We are TOP 5 exporter in China.
As we all known, polyacrylamide used in water treatment is widely topic, like how to choose the polyacrylamide to suit the sewage.
We will give you a brief guide about that.
Application of polyacrylamide in sewage treatment, molecular weight by a few million to tens of millions of high-molecular water-soluble organic polymer. Polyacrylamide having to form larger floc and the resulting huge surface adsorption between the particles. Thus, in recent years, domestic and foreign research and applications have progressed rapidly. Many different types of polyacrylamide.
By the end of 2014 so far, the domestic polyacrylamide polymer are: non-ionic polyacrylamide (abbreviated NPAM, the molecular weight of 800-1500 million), anionic polyacrylamide (abbreviated APAM, the molecular weight of 800-2000 million), cationic polymerization acrylamide (abbreviated CPAM, the molecular weight of 800-1200 million, or ion degree of 10% -80%). The dosage is generally the amount of wastewater to two millionths of a millionth.
Which was the most widely used to belong to a molecular weight of more than 10 million polyacrylamide. Practice has proved that different polyacrylamide polymer, the effect of different water treatment vary greatly. The amount of the amplitude of its best little more than a certain range, but will form a stable complex. Molecular high degree of polymerization of the water-soluble organic polymer or copolymer, containing many particles and with certain points on the surface of the fine particles of suspended solids emblem acting reactive groups and a molecular weight in the hundreds of thousands to several million. According to the active groups on the polymer monomer in water dissociation, the groups classified by function can be divided into non-ionic, anionic and cationic three categories.
When the ionic polyacrylamide, and the particles with opposite electrical surface charge, polyacrylamide consider to be reduced. The dual role of potential and adsorption bridging flocculation effect is particularly significant; and when it points of the micelle surface charge are the same, the requirements of both the charge is not too strong. To give full play to the role of adsorption bridging polyacrylamide, it should be a long-chain grow to the maximum, while allowing dissociable groups maximum and fully exposed the degree of dissociation, in order to produce more live parts, and collide with the particles have more opportunities, the results can be improved flocculation several times.
In the sludge dewatering polyacrylamide appropriate choice is very important to select polyacrylamide with high efficiency, with less principle. Generally, organic sludge suitable for adding a cationic polyacrylamide, and should be added to the inorganic sludge anionic polyacrylamide. Municipal sludge mainly organic sludge-based, and with a certain amount of negative charge, so choose a cationic polyacrylamide. Theoretically, the molecular weight polyacrylamide, the higher the flocculation efficiency, and in the practical application of the charge cationic polyacrylamide sludge quality selection decision correctness, the more expensive the higher the price of the ions. In practical applications, the molecular weight polyacrylamide is generally used in about 10 million can be.
In the treatment of domestic sewage treatment process, use of polyacrylamide generally divided into two processes, one polymer electrolyte and particle surface charge neutralization; the second is a long-chain polymer electrolyte particle bridge formation of floc. The main purpose of flocculation by adding polyacrylamide sludge in tiny suspended particles and colloidal particles coalesce into coarse floc. With increasing floc, settling velocity is gradually increased. So it can better filter press sludge by, and then meet the requirements of environmental protection process.
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