The importance of alumina content in polyaluminum chloride

In the field of sewage treatment and water purification, Polyaluminum Chloride is a widely used and highly effective flocculant. Among the various indicators for assessing the quality and performance of polyaluminum chloride, the content of aluminum oxide is undoubtedly one of the most critical factors. It significantly influences the effectiveness, application scope, and cost-effectiveness of polyaluminum chloride.

Alumina content is a key indicator to measure the active ingredients

The aluminum oxide content in polyaluminum chloride is a key indicator of its active components. Generally, a higher aluminum oxide content means that polyaluminum chloride can more effectively perform flocculation and sedimentation in wasteWater Treatment. When polyaluminum chloride is added to wastewater, the aluminum oxide undergoes hydrolysis and polymerization reactions in water, forming a series of highly charged multi-nuclear hydroxyl complexes. These complexes neutralize the charges on the surfaces of colloidal particles, causing them to lose stability and aggregate, forming larger flocs. This accelerates the sedimentation process, effectively removing suspended solids, colloidal substances, and some dissolved organic matter from the water. If the aluminum oxide content is low, the effective components available for reaction are insufficient at the same dosage, making it difficult to achieve the desired flocculation effect. As a result, impurities in the wastewater cannot be fully precipitated and separated, significantly reducing the purification efficiency of the water.

Different alumina contents determine the difference of application range

Based on the varying levels of alum content, polyaluminum chloride can generally be categorized into several grades, such as 30%,28%,26%, and 24%. Different grades are suitable for treating different water qualities. When treating highly turbid wastewater, which contains a significant amount of suspended solids, a higher alum content is required to achieve strong flocculation. High-alum-content polyaluminum chloride can quickly form large flocs, rapidly coagulating and precipitating impurities in the water, effectively reducing the turbidity of the wastewater. However, for low-turbidity wastewater, using high-alum-content polyaluminum chloride might result in suspended solids not settling. This is because some wastewater has a high acidity, and high-alum-content polyaluminum chloride products are often acidic, making it difficult for them to react effectively with the substances in the wastewater. Additionally, the suspended solids in the water may be too light, and high-concentration polyaluminum chloride cannot effectively drive them to settle. Therefore, when treating low-turbidity wastewater, it is more appropriate to choose polyaluminum chloride with a relatively lower alum content.

Alumina content affects cost effectiveness

From a production standpoint, the alumina content is closely linked to production costs. Producing high-alumina-content polyaluminum chloride requires higher-quality raw materials and more precise manufacturing processes, which inevitably increases production costs. However, in practical applications, a higher alumina content is not always better; it is essential to consider both cost and treatment effectiveness. In wastewater treatment, blindly pursuing high-alumina-content polyaluminum chloride without considering the actual water quality can lead to increased treatment costs and may fail to achieve optimal results. Therefore, selecting polyaluminum chloride with an appropriate alumina content ensures effective water treatment while reducing costs, thus maximizing cost efficiency.

In summary, the aluminum oxide content in polyaluminum chloride is of significant importance in wastewater treatment and water purification. It is not only a key indicator for assessing the effective components of polyaluminum chloride but also determines the product's applicability and cost-effectiveness. In practical applications, it is essential to scientifically and reasonably select polyaluminum chloride products with appropriate aluminum oxide content based on different water quality conditions to achieve optimal water treatment results and economic benefits.