What are the application methods of polyaluminum chloride as a water treatment coagulant?

     Polyaluminum chloride (PAC) is widely recognized as a water purification agent, and its usage methods are generally well understood. This product is primarily used for wastewater treatment to reduce water pollution. However, if used improperly, it can cause certain harm to humans or other living organisms. As a result, many users have raised concerns about its application—after all, the very purpose of using this product is to minimize harm, so why would its use potentially cause damage? Therefore, it is essential to emphasize safe and proper usage methods. When applied correctly, PAC not only avoids causing harm but also brings significant convenience to our daily lives. Below, we will provide a detailed introduction to its proper application methods:

     First, determine the appropriate dosage based on the specific characteristics of the raw water. Before full-scale application, it is advisable to conduct a small-scale jar test to establish the optimal dosage ratio. For ease of calculation, the pilot test solution is typically prepared as a weight/volume (W/V) percentage, usually between 2% and 5%.For example, to prepare a 3% solution: weigh 3 g of PAC and place it into a clean 200 mL graduated cylinder. Add approximately 50 mL of water, stir until the PAC is fully dissolved, then dilute with additional water up to the 100 mL mark, and mix thoroughly.

    In actual production, first mix the solid PAC with clean water at a ratio of approximately 1:5 (solid:water) to dissolve it completely, then further dilute with water to achieve a final working solution concentration of 2% to 5% (W/V). Note that concentrations below 1% are prone to hydrolysis, which can reduce treatment effectiveness, while excessively high concentrations may lead to unnecessary waste—so proper dosing is crucial.

    Additionally, please note that this product is compatible with all types of water treatment equipment, including large-scale systems. Always add the chemical according to the dosage determined from your tests, and continuously monitor system performance during operation.

    If you observe insufficient floc formation in the sedimentation tank and high residual turbidity, this indicates the dosage is too low—slightly increase the amount of PAC.

    Conversely, if large flocs rise to the surface ("floc carryover") and residual turbidity remains high, this suggests overdosing—reduce the dosage in subsequent applications.

    These observations and recommendations are based on extensive testing conducted by our company. We strongly advise users to adapt dosing strategies according to local water conditions and seasonal variations for optimal results!

   By mastering the correct and proper usage of polyaluminum chloride (PAC), you not only save labor but also reduce raw material costs for your company, achieve ideal water quality, and minimize damage to equipment—so why wouldn’t you do it?

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