How much polyaluminium chloride is needed to treat a ton of wastewater? Polyaluminium chloride is used for sewage treatment and is mainly yellow or yellowish brown powder solid. Polyaluminium chloride has coagulation effect and is suitable for printing and dyeing factories, paper mills, leather factories, food factories and other industries. PAC coagulant also has phosphorus removal effect, which can form precipitation with phosphate in wastewater. It is suitable for phosphorus removal in sewage treatment plant. Polyaluminium chloride is commonly used as coagulant and dephosphorization agent alone. Because of different effects, the concentration and dosage of polyaluminium chloride are also very different. How to judge the concentration and dosage of polyaluminium chloride under normal circumstances?
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% (which can be dissolved by gas mixing or mechanical mixing). The dosage can be determined according to the turbidity of raw water. Generally, when the turbidity of raw water is 100-500mg / L, the dosage is 10-20K g / 1000 tons of water, which can be determined according to the pilot test.
When polyaluminium chloride is used in urban sewage or industrial sewage, the corresponding dosage and concentration are different. In order to improve the treatment capacity, it is best to ensure the dose and effect through small-scale test to field test. Mix solid polyaluminium chloride (at room temperature) with water in the ratio of 1:3, dilute it with 25-30 times of clear water for about 30 minutes, and then put it into water for operation. The consumption of drinking water purification is 1 / 100000 of the raw water, that is, the consumption (solid) per thousand tons of water is about 15kg of polyaluminium chloride. According to the turbidity and content of water quality in this area, the dosage can be found out through experiments. Before use, you can do a small test to find out the dosage, and then add it.