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PolyAluminium Chloride for Drinking Water Treatment

  • Author:Hana Wang
  • Source:Original
  • Release on:2021-03-05
In the treatment of drinking water, the polyaluminium chloride coagulant used can only be white polyaluminium chloride, but it cannot be yellow common polyaluminum chloride. Why is this?

Yellow polyaluminium chloride is abbreviated as PAC, which is a water-soluble inorganic polymer polymer between AlCl3 and Al(OH)3. White polyaluminium chloride is spray-dried from aluminum hydroxide powder and high purity hydrochloric acid. A white or milky white powdered fine powder, which melts when exposed to air, can only be used as a white polyaluminium chloride in the treatment of drinking water. It cannot be a yellow polychlorinated chloride. The reason for aluminum is that it has a great relationship with the effective substance content and performance index of these two products.

The aluminum content of ordinary polyaluminium chloride, which is yellow polyaluminium, is significantly lower than that of white polyaluminium chloride. In drinking water treatment, in order to accelerate the reaction rate, a high content of polyaluminium chloride is used, and, The basicity of salt is also an important factor in the reaction of polyaluminium chloride products. The normal yellow polyaluminium chloride has a salty degree of 80% or 90%, while the white polyaluminium chloride has a salty basicity of only about 50%. That is, ordinary polyaluminium chloride has a high content of heavy metals. Excessive heavy metal content will affect the safety of drinking water. In summary, common polyaluminium chloride cannot be used for the treatment of drinking water, while white polyaluminium chloride is more suitable. Used in drinking water treatment.

The cost of polyaluminium chloride water is 20~80% lower than other inorganic coagulants; It can quickly form flocs, and has large flocculation and quick settling speed; It adapts to various temperature water sources and has good solubility; Liquid products can adapt to automation Dosing, corrosion is small, convenient operation, and long-term use does not block the tube. If customers have special requirements on quality, they can produce according to the indicators provided by customers.

1. a wide range of applications, adapt to a wide range of water. The water purification effect is obvious, the turbidity rate is as high as 96%, the decolorization rate is 60%, and the COD removal rate is 50%. This can effectively remove the color elements SS, COD, BOD and heavy metal ions such as potassium, lead and mercury, oils and humus, etc. .

2. flocculation and sedimentation speed, overdosage will not cause water turbidity, the water temperature is low, it can still maintain a stable coagulation effect.

3. Its degree of alkalization is higher than other aluminum salts and iron salts, and it is less corrosive to equipment.

4.  a wide range of suitable PH value (5-9).

Application area

It is mainly used for the purification of drinking water and the treatment of industrial waste water and special water (such as oily sewage, printing and dyeing papermaking wastewater, sewage treatment, smelting sewage, radioactive substances, toxic heavy metals such as Pb and Cr, and fluorine-containing sewage, etc.) Drilling, tanning, metallurgy, papermaking and other industries.


In order to achieve the flocculation effect and economic benefits, the user can determine the dosage by experiments according to different raw water turbidity, different seasons and different pool shapes. The liquid product is formulated as a 5-10% aqueous solution, and the solid product is formulated as a 3-5% aqueous solution (calculated as the weight of the product). The higher the turbidity of raw water is, the thinner the solution should be, the more dosage is needed, and the flocculation effect is good.


a. Water treatment agents of different manufacturers or different brands cannot be mixed and must not be mixed with other chemicals.

b. The stock solution and diluent are slightly corrosive, but lower than other inorganic coagulants.

c, product effective storage period: liquid for six months, solid two years. Solid products can still be used after the tide.

d. After the product is properly dosed, the purified water meets the drinking water hygiene standards.