Polyaluminum chloride solution is more suitable for the preparation of the concentration of Polyaluminum chloride users know that it is a yellowish brown powder solid, used in sewage treatment is generally to dissolve the powder into a solution through the dosing pump plus Drug treatment. Then the solution concentration should be appropriate? Because some said the concentration of less than 3% hydrolysis occurs, can not play the role of flocculation. First of all, aluminum chloride content of PAC is generally 28%, hydrolysis of aluminum that is ionized aluminum ionization occurs, because aluminum is amphoteric hydroxide, will produce double hydrolysis, when the PAC concentration of less than 3% When the effective content of ingredients become smaller, the aluminum ionization speed, resulting in no coagulation mechanism, if you increase the concentration of the solution, the ionization rate can be reduced to coagulation mechanism, which is the principle of ionization. The initial use of aluminum chloride, solid products can be dissolved into 10% water after use, or according to sewage characteristics of the test to determine the concentration and dosage. There is also the use of polluting wastewater treatment polyaluminum chloride can be combined with the use of polyacrylamide effect will be better, add separately after adding polyalkali plus polypropylene.