Polyacrylamide polyacrylamide referred PAM, divided anion (HPAM) cation (CPAM), nonionic (NPAM) is a linear polymer, a water-soluble polymer compound is one of the most widely used species, polyacrylamide and its derivatives can be used as an effective flocculants, thickeners, paper and fluid drag reduction enhancer agent, is widely used in water treatment, paper, petroleum, coal, mining, geology, textile , construction and other industrial sectors. Technical Specifications Item Model Appearance molecular weight (million) Solid content% ion degree or a degree of hydrolysis% residual monomer% range anionic white granules or powder 300-2200 ≥88 10-35 ≤0,2 degree of hydrolysis in water PH value or alkaline cationic ion-white granules 500-1200 ≥88 ° 5-80 ≤0,2 centrifugal belt machine, filter nonionic white particles 200-1500 ≥88 degree of hydrolysis 0-5 ≤0,2 water PH value is neutral or alkaline zwitterionic ion white particles 500-1200 ≥88 ° 5-50 ≤0,2 belt filter press machine centrifugal gravity 0.62 anionic action principle a density 0.5) flocculation principle : PAM used for flocculation, the flocs species with the surface properties, especially the PH value zeta potential, viscosity, turbidity and suspension related to zeta potential of the particle surface, the particle is added to the polymerization reason surface charge opposite to PAM can make dynamic potential decrease cohesion. 2) adsorption bridging: PAM molecular chain is fixed on different surfaces of the particles, forming bridges between the polymer particles, the particles form aggregates and sedimentation. 3) surface adsorption: adsorption of polar groups of various particles PAM molecule. 4) enhancement: PAM molecular chain and dispersed through a variety of mechanical, physical, chemical and other effects, the dispersed phase implicated together to form a network of 3 Product Features 1, flocculation: PAM allows suspended material by charge neutralization, rack adsorption bridge, from the flocculation. 2, adhesion: through mechanical, physical, chemical effect, since adhesiveness. 3, lowering resistance: PAM can effectively reduce the fluid friction, can be added to the water trace PAM 50-80% reduction in resistance. 4, thickening: PAM were thickening effect under neutral and acid conditions, when the PH value of 10 or more easily hydrolyzed PAM. When a semi-mesh structure, thickening more obvious. PAM 4PAM precipitation precipitation precipitation process technology is a chemical reaction produces substances insoluble in the reaction where the solution. From the word meaning to understand that gravity sedimentation removed. Sewage suspended matter, can it be a physical process is simple, works well, is one of the important technologies for sewage treatment. Depending on the nature of suspended matter concentration and performance polyacrylamide gel flocculation, sedimentation can be divided into: natural precipitation, flocculation, sedimentation area. Higher levels of suspended particles precipitate concentration weeping domain (5000mg / L or more), sedimentation of particles being around other particles influence the relative position between the particles remain unchanged sink together to form a whole, there is a clear interface between the mud and water clarification . Secondary sedimentation tank and sludge thickening pool area precipitation has occurred. Wastewater suspended solids concentration is not high, and not having an aggregation properties, during the precipitation, the solid particles do not change shape, do not adhere to each other, each independently complete the precipitation process. (Grit chamber and primary sedimentation tank initial precipitation) compression precipitation occurs in the process of settlement of high concentrations of suspended particles, due to the high concentration of suspended particles, has been squeezed between the particles agglomerate structure integrated with each other, touch each other, support each other, the lower water is squeezed out between the particles by gravity upper course particles, so that the sludge was concentrated. Clarifier sludge hopper polyacrylamide concentration process and concentrated pool of sludge concentration in the presence of compression precipitation process. Freedom precipitation occurs in the water suspended solids concentration is not high, interference between precipitation of suspended solids, particles each individually precipitation, precipitation of particles linear trajectory. Throughout the precipitation process, the physical properties of the particles, such as shape, size and specific gravity does not change. Such particles are precipitated sand basin is free settling. Clarifier sludge hopper in the concentration process and concentrated pool of sludge concentration in the presence of compression polyacrylamide precipitation process. Flocculation is the process of particulate matter in the water for flocculation of. After adding coagulant in water, colloidal and suspended matter in which the dispersed particles generated in the interaction of molecular force in settling floc and collide with each other during their cohesion, its size and quality continues to become larger, increasing the settling velocity . Removal of suspended solids is not only dependent on the settling velocity, and with the precipitation depth. Surface water formed after adding coagulant alum, sewage organic suspended solids, sludge flocculation phenomenon will appear in the precipitation process. 5 ways pharmaceutical dosing dosing method pharmaceutical dosing dosing gravity and pressure dosing, dosing Either way, by the dissolution of the pool to the solution tank to the liquid dosing point, lifting equipment shall be provided with the liquid, lifting equipment is commonly used in liquid metering pumps and ejectors. 1. Gravity dosing by gravity within the pharmaceutical dosing pump suction pipe or suction well suction bell at the mixed use of the pump impeller. 2. Pressure dosing pump or ejector use the drug is added to the original cast water pipes for the pharmaceutical investment and added pressure pipes, or need investment and added higher elevation, the water structure in the distance. 3. Pump dosing pump dosing to enhance the pool of liquid in the solution to the pressure tube directly using a metering pump and using acid which in turn has enhanced the role. Polyacrylamide prior to use is generally formulated as needed to 0.5% of the 0.1% stock solution was diluted, the prepared solution is preferably not be stored too long to use, the concentration range of the solution before use further diluted to 0.01 requires closer The solution to 0.05, the reason is that we can be more ribs on the flocculant in the suspension system of decentralized, can reduce the amount, and can achieve better flocculation.