Polyaluminum chloride solution on the preparation of the concentration of more appropriate? Polyaluminum chloride users know that it is a tan solid powder, used in sewage treatment is generally the powder dissolved into a solution, dosing pump by dosing. Then the solution concentration should be appropriate? 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% , The effective content of ingredients become smaller, the ionization speed of aluminum is large, resulting in no coagulation mechanism. If the concentration of the solution is increased, the ionization speed can be reduced and the coagulation mechanism occurs, that is, the ionization balance principle. 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.