Hydrolyzed polyacrylamide (alkalization) Polyacrylamide was dissolved in the same time adding a certain percentage of sodium hydroxide, dissolved placed about 8h to make it fully hydrolyzed (alkalization), after hydrolysis can curl polyacrylamide polymer chain fully stretched, it greatly increases the opportunities for small and alum adsorbed particles collide, adsorption bridging role netting polyacrylamide given full play, so as to further improve the coagulation effect. Practical experience shows that hydrolysis now with the current ratio (alkaline ratio) to be larger, generally used in 1 to 0.2 is appropriate, ie 1g polyacrylamide added 0.2g sodium hydroxide. If the hydrolysis time to meet the 8h, hydrolysis ratio should be used 1:0.01 ~ 1:0.05. Hydrolysis hydrolysis time shorter than the larger required, but hydrolysis of purified water quality pH value higher than that caused over the General Assembly. If you use more than 30% degree of hydrolysis of anionic polyacrylamide, the hydrolysis step can be removed. ① polyacrylamide as water coagulant, must stir to dissolve dosage use. Otherwise it can not play its proper and efficient coagulant effects, dosing system will result in clogged filter surface closure, destruction efficiency filter, greatly reducing the adverse consequences of filter backwash cycle. Stirring to dissolve the speed should be controlled at 400 ~ 1000r / min, stirring to dissolve the time about 1h appropriate. Low water temperature is low season, it is difficult to dissolve, dissolution time can be shortened with hot water, but the water temperature should not exceed 60 ℃. ② polyacrylamide as water coagulant, to get the best effect of coagulant dosage slightly, its optimal dosage is 0.03 ~ 0.4mg / L. Outside this range will not work or easily from side effects. ③ dosing point is to determine the effect of polyacrylamide flocculant precipitate bad key. Optimal dosing point in the whole process of water production and flocculation of 1/2 to 2/3. ④ In order to ensure uniform mixing, use the most dilute concentrations. Polyacrylamide concentration of about 0.05%, stirring to dissolve both beneficial and easy to use dosing, coagulant and the best results. Polyacrylamide solution should not be stored for more than 10d, can not be in contact with iron, dissolved water temperature should not exceed 60 ℃. Otherwise it would polyacrylamide molecular chain is broken and lost coagulant effect and cause the water to purify acrylamide monomer content increased adverse consequences. ⑤ hydrolyzed polyacrylamide (alkaline) can improve the coagulation effect. Hydrolysis time should be about 8h, the best ratio is 1:0.01 ~ 1:0.05 hydrolysis. In the actual production is often emergency use, no sufficient hydrolysis time, hydrolysis ratio can be achieved by increasing the purpose of better hydrolysis. Hydrolysis now with the current ratio of 1 to 0.2 is more appropriate. In order to purify the water ⑥ acrylamide monomer content does not exceed health standards, must polyacrylamide high degree of polymerization of drinking water as coagulant, requires the use of acrylamide monomer content of less than 0.2% of the product . ⑦ variety of raw water quality (including about 35% overload), efficient coagulant polyacrylamide flocculant can play a good effect precipitation. Shiwan water as the third workshop, which is designed water supply capacity is 15 × 104t / d. Polyacrylamide as coagulant dosage of 0.05mg / L, the premise of ensuring quality water, the amount of water throughout the day to reach 22.3 × 104t, exceed 48.7% of the design capacity of the water supply. Polyacrylamide purports to fully play its bridging role, it must be able to create good conditions for amide groups in the molecule in contact with water, suspended particles. Although polyacrylamide molecules linearly, but the linear chain is coiled into a spiral shape, which the amide group can not fully exposed, and thus non-ionic polyacrylamide flocculant before using alkaline hydrolysis. Hydrolyzed polyacrylamide molecules with the carboxylic acid group, a carboxylic acid group ionized so that negatively charged, according to the principle of equivalence electric repulsion, a carboxylic acid group on the molecular chain of mutually exclusive, so that the curl of the molecular chain spread out, to expose amide group purposes, but also to achieve a sufficient chain length required for the occurrence of bridging. Because of the affinity group and a carboxylic acid amide group representing small suspended particles, with its negative charge carried by the water and natural negatively charged particulates generated repulsion effect, polyacrylamide alkaline hydrolysis and therefore can not be over, there should be one of the most good degree of hydrolysis, in which the degree of hydrolysis, both the active groups fully exposed, without excessive hydrolysis of the active groups which cause too strong repulsion between the particles, so as to maximize the polyacrylamide flocculation . Generally considered the best degree of hydrolysis of polyacrylamide 30 is appropriate. National Toll Free: 400-770-3343 For more information about please visit our website: polyacrylamide: www.lebangshui.com www.gylbjs.com PAC: www.lb0371.com If necessary, please contact: Miss Manager Mobile: 13783609559 Tel: 0371-66488833 Wang Mobile: 13838568817 Tel: 0371-66488876