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How to choose polyaluminum chloride?

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Industry News

2022-02-18

There are many polyaluminum chloride water purifiers available on the market. We can’t help but start making a selection. We should choose the water purifier that best suits our needs. So, what kind of water purifier do we need? We can make our selection based on the following aspects.

First, we should understand the type of our wastewater and select the appropriate chemicals based on its characteristics. If we fail to consider the nature of our wastewater and blindly choose chemicals, we won't be able to achieve our intended goals and may even compromise our efficiency. Polyaluminum chloride can be categorized into solid and liquid forms. The key difference between them lies in their prices: liquid polyaluminum chloride is significantly cheaper than its solid counterpart, though its transportation costs are relatively higher. Polyaluminum chloride can also be classified into three forms: drum-dried, frame-type, and spray-dried. Among these three forms, spray-dried polyaluminum chloride is an excellent choice, particularly for drinking water treatment, as it has a lower content of water-insoluble substances. Frame-type polyaluminum chloride is suitable for domestic wastewater treatment; although its performance is slightly inferior to that of spray-dried polyaluminum chloride, it still outperforms drum-dried polyaluminum chloride in terms of overall effectiveness.

In addition, when selecting polyaluminum chloride, the content of polyaluminum chloride itself should also be taken into account. There are many different types of polyaluminum chloride available. Generally speaking, when wastewater pollution is not severe, a polyaluminum chloride with a lower content should be chosen; conversely, when wastewater pollution is serious, a polyaluminum chloride with a higher content is recommended. The choice of polyaluminum chloride depends on its specific characteristics. In industrial wastewater treatment, polyaluminum chloride is typically produced using bauxite as a raw material, whereas aluminum hydroxide is usually used as a raw material for purifying drinking water or tap water. These two products have very distinct differences.

What are the key indicators when selecting polyaluminum chloride?

(1) First, there is the degree of alkalinity—the extent to which polyaluminum chloride undergoes hydroxylation or alkalinization in a particular form is referred to as its alkalinity or degree of alkalinization. It is typically expressed as the molar ratio of hydroxide to aluminum, denoted by B = [OH]/[Al]. Alkalinity is one of the important indicators of polyaluminum chloride and is closely related to its flocculation performance. The higher the concentration and salinity of the raw water, the better the flocculation effect. In summary, within the range of raw water turbidity from 86 to 10,000 mg/L, the alkalinity of polyaluminum chloride typically falls between 40% and 85%. Many other properties of polyaluminum chloride are also associated with its alkalinity.

Polyaluminum chloride

(2) Second, the pH value—The pH value of a polyaluminum chloride solution is also an important indicator. It reflects the concentration of free OH- ions in the solution. Generally speaking, the pH value increases as the alkalinity rises; however, for liquids with different compositions, there is no direct correlation between pH value and alkalinity. Moreover, even when liquids have the same alkalinity but differ in concentration, their pH values will also differ.

(3) Aluminum oxide content: The aluminum oxide content in polyaluminum chloride is a measure of the product’s active ingredient, and it is related to the solution’s specific gravity. Generally speaking, the higher the specific gravity, the higher the aluminum oxide content. Its viscosity is also related to the aluminum oxide content and increases as the aluminum oxide content rises. Under the same conditions and at the same aluminum oxide concentration, its viscosity is lower than that of aluminum sulfate, making it more convenient for transportation and use.

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