In the actual use process, polyaluminium chloride not only has strong coagulation and turbidity removal effect, but also has obvious decolorization and humus removal effect. It can achieve the best flocculation under the same treatment conditions. The dosage of polyaluminum chloride is as much as 2 / 3 lower than that of traditional aluminum salt. Under the same dosage conditions, polyaluminum chloride can obtain lower residual turbidity than that of traditional aluminum salt, Therefore, the same treatment results can be obtained at a lower dose.
Precautions for use of polyaluminium chloride precipitant:
1. According to the dosage of 5-8KG per 1000 cubic meters of water. When in use, first dissolve the solid polyaluminium chloride, after about ten minutes, add water to dilute to 2-3% solution, and then sprinkle it into the swimming pool. Sprinkle it evenly.
2. The pH of the water should be adjusted to about 7.5 before adding the precipitant in the swimming pool. This is because the optimum pH range of polyaluminium chloride is 7.5-8.5. In alkaline environment, it can give full play to its hydroxyl bridging effect, accelerate coagulation and sedimentation.
3. It is better to put polyaluminium chloride precipitant in the evening and absorb the pollution before the sun comes out the next day. Note that if there are people in the swimming pool, do not put precipitant in.
4. Preferably 30% polyaluminium chloride can be selected.
The pH range of polyaluminium chloride is much wider than that of traditional aluminum salt. Generally, in low-temperature water, the coagulation and turbidity removal efficiency of traditional coagulants is significantly reduced, resulting in the deterioration of effluent quality. However, the use of polyaluminium chloride, whether in low-temperature or normal temperature water, can obtain better coagulation and turbidity removal effect. In addition, polyaluminium chloride can significantly improve the solid-liquid separation efficiency, Improve the performance of sedimentation filtration and sludge dewatering, so as to shorten the residence time of the sedimentation tank and increase the water production. In addition, due to the large and compact flocs, it is easy to carry out filtration and sludge dewatering. The residual aluminum content in the water after aluminum chloride treatment is very low, and the residual aluminum content in the traditional aluminum sulfate treatment water is generally 150 ~ 255 μ G / L, while the residual aluminum content in Polyaluminium treated water is only 40-55 μ g/L。.