Several major indexes affecting the flocculation effect of polyaluminum chloride
Polyaluminum chloride (PAC) is a widely used flocculant for water treatment, and its properties are directly related to the water treatment effect and water quality safety. In the application process of PAC, there are several key quality indicators that have an important impact on the flocculation effect. This article will explore these metrics in detail to better understand how they affect the flocculation performance of PACs.
First, the salt base
Basicity, also known as alkalization, is a measure of the degree of hydroxylation or alkalization in PAC, usually expressed as a percentage of the hydroxy-aluminum molar ratio B=[OH]/[Al]. This index is one of the most important quality parameters of PAC, and has a close relationship with the flocculation effect.
In the range of raw water turbidity of 86 to 10,000 mg/L, the optimal basicity of PAC is usually between 40% and 85% (in molar ratio, the corresponding value is about 409 to 853). When the concentration of raw water is high, appropriate increase of basicity can enhance the flocculation capacity of PAC and improve the purification effect. In addition, many other characteristics of PAC, such as solubility, stability, etc., are also closely related to the basicity.
2. pH value
The pH value of PAC solution is another important indicator, which reflects the number of hydroxyl ions (OH-) in the free state in the solution. The pH value of PAC usually increases with the increase of basicity, but there is not necessarily a direct correspondence between the pH value and basicity of PAC liquids with different compositions.
In practical applications, the pH value of PAC solution needs to be adjusted according to the pH value of raw water and the desired treatment effect. In general, an appropriate pH range helps PAC perform its best flocculation. At the same time, pay attention to avoid the pH value is too high or too low, so as not to cause corrosion to the treatment equipment and pipelines or affect the flocculation effect.
Third, alumina content
Alumina content is a measure of the active ingredients in PAC products, and it has a certain relationship with the relative density of PAC solution. In general, the higher the relative density, the higher the alumina content. The content of alumina directly affects the flocculation performance and cost effectiveness of PAC.
PAC with high alumina content usually has better flocculation effect and stronger precipitation capacity, and can remove suspended substances and colloidal substances in water in a short time. At the same time, PAC with high alumina content can also reduce the dosage of the agent in the subsequent treatment process, reducing the operating cost.
4. Other factors
In addition to the above three main indicators, there are some other factors that may also affect the flocculation effect of PAC, such as the molecular weight distribution of PAC, morphological structure, impurity content and so on. Although these factors are not the main factors that directly affect the flocculation effect of PAC, they still need to be paid attention to and controlled in practical applications.
For example, PAC with uniform molecular weight distribution usually has better solubility and stability; PAC with reasonable morphology and structure can more effectively combine with suspended matter and colloidal matter in water to form floc. PAC with high impurity content may affect its flocculation effect and safety.
conclusion
In summary, basicity, pH value and alumina content are the three main indexes that affect the flocculation effect of polyaluminum chloride. In practical applications, appropriate PAC products need to be selected according to raw water quality and treatment requirements, and these indicators are strictly controlled to ensure the best flocculation effect and water quality safety. At the same time, it is also necessary to pay attention to other factors that may affect the flocculation effect of PAC, and take corresponding measures to control and optimize.
Focus on water treatment, just for a healthy world! Henan Hongze Environmental Protection Technology Co. is a professional enterprise engaged in the development, production and sales of polymer flocculants. The main products are "green water clean" brand polyaluminum chloride,
Polymerized Ferrous Sulfate, Polyacrylamide, Trichloroisocyanuric Acidpolyferric sulfate and other water purifiers. With an annual output of 10,000 tons, the products are sold all over the country, and actively explore the international market. The company will continue to uphold the business philosophy of "integrity, innovation and win-win", provide customers with quality products and services, and make due contributions to the society.
Henan Hongze Environmental Protection Technology Co., Ltd
