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How to purchase high-efficiency polyaluminum chloride?
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2022-01-19
Polyaluminum chloride is a commonly used water purifier. Given the low technological barriers to production in the market and the wide variation in product quality, how can you choose the right PAC? First, you should understand your own needs and how you plan to use it, then make your selection based on the product’s specific characteristics. This way, you can purchase the appropriate water purifier.
Polyaluminum chloride is a commonly used water purifier. Given the low technological barriers to production in the market and the wide variation in product quality, how can you choose the right PAC? First, you should understand your own needs and how you plan to use it, then make your selection based on the product’s specific characteristics. This way, you can purchase the appropriate water purifier.
The appearance can be categorized into brown, khaki, yellow, pale yellow, and white. Brown polyaluminum chloride is classified as industrial-grade, while khaki polyaluminum chloride is classified as both industrial- and drinking-water-grade. Prices have risen again. It’s important to note that color is assessed from an overall perspective rather than from the perspective of packaging.
Alkalinity is the fundamental component responsible for the morphological changes in polyaluminum chloride, and it refers to hydroxyl (OH) radical ions. The indicator used to measure OH ions in polyaluminum chloride is alkalinity, typically defined as the percentage ratio of OH to Al in the polyaluminum chloride—usually ranging from 40% to 90%. When alkalinity is low, the coagulation effect is poor. It should be noted that the alkalinity of polyaluminum chloride intended for beverage applications is controlled at 50%, while that for industrial use is controlled at 80%.
The water-insoluble substances in PAC are also referred to as solubility. The general solubility of the product is greater than 99%, meaning that the proportion of water-insoluble matter is about 1%. For drinking-grade products, the solubility is greater than 99.8%, indicating that the proportion of insoluble matter is less than 0.2%. There are four production methods, each yielding products with varying levels of polyaluminum chloride content. The available product grades include standard industrial grade, plate-and-frame filter press grade, industrial-grade plate-and-frame filter press grade, drinking-water grade, and spray-dried type.
The proper use of polyaluminum chloride directly affects its effectiveness. The accurate application of polyaluminum chloride typically depends on the method and dosage used. However, in practical applications, the method of using polyaluminum chloride can also vary depending on site-specific conditions. What issues should be taken into account in actual applications?
In fact, commonly used polyaluminum chloride is used in melting equipment. The dissolved polyaluminum chloride is added to wastewater via reaction-addition equipment. Typically, during the reaction process, corresponding reaction tanks, subsequent sedimentation equipment, or dewatering equipment are set up. Only through the functions of these devices can the polymerization of aluminum chloride achieve better application results.
There are many types of dissolution equipment for polyaluminum chloride in practice, but generally, tap water is used directly for dissolution, and corresponding stirring equipment is employed to ensure thorough dissolution of the PVC-aluminum chloride. Preparing the PVC-aluminum chloride into a solution and adding it to the wastewater essentially constitutes a dosing device. This dosing device pumps the aqueous solution of PVC-aluminum chloride into the sewage, and the reaction apparatus typically consists of a flow-through system. By adding the PVC-aluminum chloride solution into the flowing sewage, thorough mixing and reaction can be achieved even under slow-flow conditions. Subsequently, the reacted liquid undergoes purification through appropriate sedimentation or pressure filtration equipment, thereby achieving the desired water treatment effect.
When using polyaluminum chloride, one should take into account its inherent characteristics and select the appropriate aluminum chloride product based on the wastewater treatment conditions. Then, apply it according to the actual situation to achieve the desired results.
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