Description: Johnson Waters Polymer Feed Systems are designed to help get the best efficiency from your polymer treatment program. Newer polymers exhibit characteristics that require proper dilution and activation in order to reach the optimum state. Our polymer feed systems do just that, and range from inexpensive basic models (for manual adjustment only) to full-featured systems designed for automatic stand-alone operation with communications to and from the plant DCS. Each polymer feed system features outstanding
design characteristics and offers excellent mixing and dilution efficiency due to the use of 2 different static mixers to ensure thorough mixing without damage to fragile polymer chains.
Blending Process
Many polymers used for coagulation enhancement do not blend easily with
water. If
water is added to the concentrated polymer, crystallization of the polymer can occur. This process is irreversible and must be avoided.
The first step in dilution requires high
energy to break the polymer up into small droplets, the smaller the better. This is done in the first stage static mixer, which is designed to give highly turbulent flow and blend liquids with large viscosity differences.
The second step is to mix the polymer droplets thoroughly into the
water. This is done using a conventional static
mixer designed for blending.
The third step, required for proper activation, is to allow the polymer time to unfold the long chains. By performing mixing properly the polymer is more easily activated than when merely adding it into the
water (such as in a
tank). Thus, the polymer becomes activated in the
pipe as its being delivered to the point of use.
Benefits
Many users mistakenly think that they can build their own low-cost polymer blending system. Often, this takes the form of a holding
tank and a
pump. The polymer and
water are added to the
tank and time is allowed for the polymer to blend. Often, a
mixer is used to gently stir the solution.