The effectiveness of Polyaluminum Chloride (PAC) in water treatment is highly dependent on using the correct dosage. Incorrect dosing can lead to inefficient treatment, higher costs, or even undesirable outcomes like residual turbidity or high chemical oxygen demand (COD). As a premier polyaluminum chloride supplier, we aim to equip our clients with the knowledge to optimize their PAC usage.

Determining the precise dosage of PAC (CAS No. 1327-41-9) is not a one-size-fits-all approach. It involves a careful consideration of several factors related to the water source and the treatment objectives. The primary method for establishing the optimal dosage is through a process known as a 'jar test'.

The Jar Test Procedure:

  1. Prepare Water Samples: Collect samples of the water you need to treat (e.g., raw river water, industrial wastewater).
  2. Prepare PAC Solutions: Dilute the PAC product to a standard concentration, typically 2-5% w/v, as recommended by the polyaluminum chloride manufacturer.
  3. Add Varying Dosages: In a series of beakers or 'jars', add progressively increasing amounts of the diluted PAC solution to identical volumes of the water sample. For example, you might test dosages ranging from 5 ppm to 200 ppm, depending on the expected contaminant load.
  4. Mix and Observe: Stir the samples vigorously for a set period (e.g., 1-2 minutes) to ensure proper mixing and initial floc formation. Then, allow the samples to settle for a defined period (e.g., 15-30 minutes).
  5. Evaluate Results: Observe the clarity of the supernatant liquid, the size and density of the formed flocs, and the rate of sedimentation. The dosage that results in the clearest water, well-formed flocs, and rapid settling is generally considered optimal.

Factors Influencing PAC Dosage:

  • Turbidity of Raw Water: Higher turbidity typically requires higher PAC dosages.
  • pH of Water: PAC is most effective within a specific pH range. Adjusting pH may be necessary to optimize PAC performance.
  • Temperature: Lower water temperatures can sometimes necessitate slightly higher dosages.
  • Presence of Organic Matter and Other Contaminants: The type and concentration of contaminants (e.g., heavy metals, dissolved organics) will influence the amount of PAC needed.
  • Desired Water Quality: The target level of purity for the treated water will dictate the required dosage.

As a leading chemical auxiliary agent manufacturer, we strongly recommend conducting jar tests before implementing large-scale treatment. Our technical team can also provide guidance on initial dosage estimations based on your specific application. When you buy Polyaluminum Chloride 1327-41-9 from us, you are assured of a product designed for efficacy, but proper dosing is key to unlocking its full potential. We are your trusted partner to help you achieve optimal results and cost savings in your water purification efforts.