What cause clogging during the dosing process of PAC?
Polyaluminum chloride is a polymer coagulant, a water-soluble polymer between aluminum chloride and aluminum hydroxide.
Usually, the dosage of polyaluminum chloride will be tested according to the water quality during use. In industrial wastewater treatment, when PAC is added, the filter tank of the filter sometimes becomes clogged. In this case, check the cause after shutdown.
First, check whether the blockage is caused by operational problems. Observe whether the added amount of polyaluminum chloride is too much, so that the PAC cannot dissolve well and cause blockage. At this time, increase the amount of water injected for polymerization to make the polyaluminum chloride dissolve better. Typically, water and polyaluminum chloride are dissolved in a ratio of 1 to 3. Do not increase the dosage of PAC. If this is not possible, the metering tube must be replaced. If not, it can only be a quality problem with the polyaluminum chloride.
PAC contains a certain amount of insoluble matter, which generally does not affect production. The lower the polyaluminium chloride content, the higher the insoluble matter. In practice, PAC is used in lower quantities due to economic issues. When using, it is necessary to increase the stirring speed and increase the amount of water injected.