Know More About Features of Polyaluminium Chloride

In the field of water treatment engineering, the demand for polyaluminium chloride PAC coagulant in various countries is increasing rapidly, especially in water treatment, it has gradually replaced the traditional flocculant and has become the mainstream flocculant. A large number of application practices have proved that the use of polymerization chlorination rate to replace traditional iron and aluminum salt coagulants can significantly improve the purification efficiency of water plants, reduce treatment costs, and improve effluent water quality.

Its main advantages are as follows

1. Excellent coagulation, turbidity, decolorization and humus removal effects and a wider range of pH. PAC not only has a strong coagulation and turbidity removal effect, but also has obvious decolorization and humus removal effects. To achieve the best flocculation under the same treatment conditions, the dosage of polyaluminum needed to be reduced by 2/3 compared with traditional aluminum salt. Under the same dosage conditions, the use of polyaluminum can obtain lower residual turbidity than traditional aluminum salts, so the same treatment results can be obtained at a lower dosage. In addition, the pH range used by polyaluminum is much wider than that of traditional aluminum salts.

2. Good low-temperature coagulation treatment efficiency and sedimentation efficiency. Generally in low-temperature water (<S°C), the coagulation and turbidity removal efficiency of traditional coagulants is significantly reduced and leads to deterioration of effluent water quality. Or room temperature water, can get better coagulation and turbidity removal effect. In addition, polyaluminum can significantly increase the efficiency of solid-liquid separation, improve the performance of sedimentation filtration and sludge dewatering, thereby shortening the residence time of the sedimentation tank and increasing the water production. In addition, because the generated flocs are large and compact, it is easy to filter and dewater the sludge.

3. Low residual aluminum content. The residual aluminum content in the water after polyaluminum treatment is very low. The residual aluminum content in the traditional aluminum sulfate treatment water is generally 150~255ug/L, while the residual aluminum content in the polyaluminum treatment water is only 40 ~55ug/L Fourth, the operation is simple: the operation process is much simpler than the traditional treatment method when using polyaluminum salt treatment.

Applications

1.Drinking water and sanitary sewage.

2.Industrial water, industrial waste water treatment, mine and water for oilfield injection, chemical waste water in industry of paper-making, metallurgy, washed coal and leather.

3.Industry and makes waste water recyclable: paper-making glue, printing and dying, concrete hardener, precision casting hardener, glycerine refinement, crease-resistant for fabric, medicine, cosmetics and etc.

4.Oil-water separation and has good effects in the oil refining industry.

PAC could be considered as one of the best alternative chemical to Alum for coagulation which has both the advantage of lesser optimum dosage and less sludge generation. Though the unit cost of PAC is more than unit cost of Alum considering the capital cost required for establishment of facilities for Alum storage and use, PAC could be still preferred as a alternate chemical. In a larger perspective the contribution of pollutant through discharge of water treatment plant sludge into the aquatic environment could be substantially reduced.