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Does temperature significantly affect the flocculation performance of polyaluminum chloride?

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Company News

2022-10-21

The so-called industrial polyaluminum chloride is primarily used for wastewater treatment. It possesses highly distinctive properties that enable it to flocculate and settle very rapidly, ensuring the entire process is efficiently completed and delivering excellent filtration performance. It does not require the addition of any alkaline additives, and can effectively remove harmful metallic substances and radioactive materials from water. Additionally, it can also eliminate bacteria and unpleasant odors.

The so-called industrial polyaluminum chloride is primarily used for wastewater treatment. It possesses highly unique properties that enable it to flocculate and settle very rapidly, ensuring the entire process is efficiently completed while also delivering excellent filtration performance. It does not require the addition of any alkaline additives and can effectively remove harmful metallic substances and radioactive materials from water. Moreover, it can also eliminate bacteria and unpleasant odors. Additionally, it is completely non-corrosive to pipelines and other equipment. The overall water purification effect is remarkably significant. This industrial polyaluminum chloride is intended solely for industrial wastewater treatment; it must never be used for purifying drinking water or other products intended for human consumption, as such use would be extremely harmful to human health.

It is said that substances used in industrial applications should be used only in industrial settings. Polyaluminum chloride, which is commonly used in daily life, is primarily employed for the purification of drinking water. These substances are closely linked to human health, and thus play a critically important role. Given their implications for health and safety, they are subject to stringent oversight by relevant authorities. Both dosage and usage are strictly controlled, and these substances can only be used after receiving approval from the appropriate regulatory bodies. Although polyaluminum chloride used in industry and daily life may look very similar, they fundamentally have different effects on the human body. Therefore, caution is required when using them. It is essential to distinguish between these two types of products. We must never mix or use them interchangeably—let alone apply them indiscriminately—so as to avoid any adverse consequences.

Polyaluminum chloride is an inorganic polymeric flocculant that has been widely promoted and applied in the market. It works through mechanisms such as double-layer compression, electrostatic neutralization by adsorption, adsorption bridging, and efficient capture of suspended particles and colloidal ions, thereby destabilizing, activating, flocculating, coagulating, and precipitating suspended micro-particles and colloidal ions in water. Due to its rapid wastewater treatment efficiency and low dosage requirement, polyaluminum chloride undergoes a hydrolysis process during flocculation; higher temperatures favor this hydrolysis reaction. Consequently, at lower temperatures, the hydrolysis time required for adding PAC is longer, whereas raising the temperature slightly can shorten the hydrolysis time.

Temperature has a significant impact on the flocculation efficiency of polyaluminum chloride. When the water temperature falls below 5°C, the hydrolysis rate of aluminum salts slows down considerably, leading to a marked reduction in flocculation effectiveness. At temperatures between 10 and 15°C, the Al(OH)3 flocs tend to be amorphous, loose, and difficult to settle. At low water temperatures, the water consumption coefficient increases, hydraulic resistance rises, and the number of floc protrusions decreases, all of which impair the flocculation performance. In such cases, a polymeric coagulant aid can be added to enhance treatment efficiency, or air flotation can be employed as an alternative to sedimentation as a subsequent treatment process. As the temperature rises, the flocs become relatively more compact and easier to settle.

Is polyaluminum chloride (aluminum trichloride) (AL) harmful to human health? We should know that polyaluminum chloride is not a hazardous material. In specific applications, it not only exhibits strong coagulation and turbidity removal effects but also demonstrates remarkable decolorization and humic substance removal capabilities. Moreover, the polyaluminum chloride used in water treatment plants typically has a concentration of 30%. This high-concentration polyaluminum chloride contains fewer impurities and boasts a higher effective content, fully meeting national drinking water standards. During the water purification process, polyaluminum chloride undergoes multiple stages of sedimentation and filtration. After filtration, any harmful residues (QMA) remaining in the polyaluminum chloride water purifier (a common flocculant) are virtually absent or present in trace amounts, posing negligible risks to human health.

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