Polyacrylamide amount use 1, the number of washing by using cationic polyacrylamide can be set between thirty kilograms to one hundred and ten kilograms; the use of the chemical industry waste water is generally fifty to one hundred and twenty kilograms of Inter; dyeing industry wastewater and paper industry wastewater treatment difficult, should increase the number to use to use to set the number of one hundred to three hundred kilograms more reasonable, electroplating wastewater industry and general industrial water is generally not more than fifty kilograms . Note the number of the number :( industry are using these types of wastewater each kiloton). 2, sewage treatment methods depending on the mud off with a flocculant is not the same. If the process the body uses biochemical methods, ie sludge dewatering (which may contain parts of the primary sedimentation of mud), just as the sludge dehydrating agent cationic PAM can. If the process the body uses physicochemical methods, such as an enhancement, loaded magnetic separation process, the general is to add PAC quenched, and then add the anionic flocculant, and finally add the cationic flocculant dehydration. Specific dosage should be based on wastewater quality. There are also many sewage treatment station, sludge dewatering directly added to PAC or other inorganic flocculants, this in frame filter, especially electronics factory or a small sewage treatment plant used widely. PAM at the time as the sludge dehydrating agent used generally in the ratio of 0.1% and water - 0.2%. Dissolved into a glue-like liquid after the vote is added to the sludge and then mixed treatment. Sludge ratio is generally 5% - 10%, and some less, this should be determined according to the concentration of the sludge, it is best to determine the optimal dosage and usage models through field experiments beaker. Different sludge, different agents, the treatment effect of different equipment, different management levels, the sludge is different. 3, the sewage treatment plant with a cationic polyacrylamide as sewage sludge dewatering operations agent. In the process of communication and customer, the customer often asked in the process of wastewater treatment sludge dewatering, sludge dewatering agent dosage problems. To know the exact opposite sludge dewatering agent dosage, first of all understand these parameters, the moisture content of the sludge, mud cake moisture content, into the clay content, into the amount of drugs, dispensing concentration. Sludge moisture content: the percentage of water contained in the sludge and sludge than the weight referred to the total weight of the moisture content of the sludge. Cake moisture content: The percentage off the sludge cake that contained water weight and total weight ratio of sludge called cake moisture content. But also through the following formula calculates an added dose mg / L = Dosing Quality / Water Treatment / dispensing concentration 2, treated water dosing dose = treated water m3 / h * Dosage g / m3 3, dry clay content = treated water * [(1- sludge moisture content) / (1- cake moisture content)] 4, pharmaceutical consumption per ton of dry mud g / m3 = dosage / dry clay content than the calculated results error may be relatively large, for reference only do water running. The actual consumption of the dose to be actually test machine operators. Action principle 1) flocculation of the principle: PAM for flocculation, the flocs species with the surface properties, in particular the zeta potential, viscosity, PH value and the turbidity of the suspension is related to the particle surface zeta potential, particle polymerization of The reason to join the opposite surface charge PAM, make the move to reduce the potential and 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 mesh.