Before polyaluminium chloride is used to treat sewage, the PH value before sewage treatment should be adjusted reasonably. Whatever the sewage is, if polyaluminium chloride is to be used, it is necessary to reduce the PH value to about 7 first, and then add polyaluminium chloride to the sewage treatment, the effect is good. This is also one of the main reasons affecting the effect of polyaluminium chloride as a water purifier.

The PH value is mainly indicative of the acidity and alkalinity of the water sample. Generally, the pH value of printing and dyeing wastewater is about 12, so that the pH value of the wastewater is reduced to about 7 at first when the alkalinity of the wastewater is high. Because the sewage is too alkaline. The higher the content of polyaluminium chloride solution, the more acidic it will be. The PH value of 10% polyaluminium chloride solution is about 1.0. And the use condition of water purification agent polyaluminium chloride is that it must be used in neutral water. PH is lower than 5.6 and higher than 8.0. It can not be used and has no effect.

According to the daily use of solid polyaluminium chloride, when diluted into liquid, green source summarizes the common methods of concentration ratio of polyaluminium chloride:

1. According to the condition of raw water, do a small test before use to get a good dosage. The small-scale solution is usually 2-5% by weight ratio. For example, with 3% solution: 3 G solid polyaluminium chloride, put into 200 ml measuring cylinder, add about 50 ml water, dilute to 100 ml after dissolution, shake well.

2. When polyaluminium chloride is used for production, it can be dissolved by mixing the solid polyaluminium chloride: clear water = 1:9 to 1:15 weight ratio. The solution with alumina content less than 1% is easy to hydrolyze, which will reduce the use effect, and the concentration is too high to be uniformly added.

3. Drug dosage should be given according to the optimum dosage obtained from the small trial. If there is less alum and more residual turbidity in the sedimentation tank, the dosage is too little; if there is too much residual turbidity in the sedimentation tank, the dosage should be adjusted appropriately.

In order to achieve better flocculation effect and economic benefits, users can determine the optimal dosage according to different turbidity of raw water, different seasons and different pools. The liquid product is composed of 5-10% water solution and the solid product is composed of 3-5% water solution. The higher the turbidity of raw water, the thinner the solution should be, the higher the dosage, the better the flocculation effect.

Green Source Water Purification Material Company is a polyaluminium chloride manufacturer with quality assurance and rich experience. It can give reasonable water purification suggestions according to the actual needs of customers for high-standard water treatment, so that enterprises can get twice the result with half the effort in the process of sewage treatment.