How to determine the concentration and dosage of polyaluminium chloride in sewage treatment？

Polyaluminium chloride is generally used as flocculant in sewage treatment, and some are used as phosphorus removal agent. Because of different functions, the concentration allocation and dosage of products are very different. Generally, how should we determine the concentration and dosage of polyaluminium chloride and what method should be adopted for mixing:

The national standard content of solid polyaluminium chloride is 28%, and the liquid content is 10%. Before using the solid, the solid shall be dissolved to a concentration of 10% (gas stirring or mechanical stirring can be used for dissolution). The dosage can be determined according to the turbidity of the raw water. Generally, when the turbidity of the raw water is 100-500mg / L, 10-20kg shall be added per thousand tons of water, which can be determined according to the small-scale test.

When polyaluminium chloride is used in municipal sewage or industrial sewage, the corresponding dosing concentration and dosage are different. In order to be accurate and improve the treatment efficiency, it is best to test the medicine on site through small-scale test to ensure the dosage and effect.

Keywords: PAC, Poly aluminum Chloride, poly aluminium chloride, Polyaluminum Chloride, PACL, Coagulant

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