Rapid / Flash Mixing
A rapid (or flash) mixer is used to uniformly disperse and blend chemicals, such as coagulant aids, chlorine, and sulfur dioxide into the process stream. These chemicals, either in solution or slurry form, are added for the purpose of neutralization, odor & color control, and/or to aid in the removal of solids.
The job of the mixer is to rapidly disperse the chemical additives to ensure a uniform mixture of the basin contents, i.e. the outlet concentration being the same as the average concentration in the basin. The unique aspect of this application is the
Mixers are used to uniformly disperse chemicals, such as coagulant aids, chlorine, and sulfur dioxide into the process stream in very short retention times. These chemicals are added for the purpose of solids removal, neutralization, odor & color control.
The conventional configuration is a top entry mixer in a rectangular basin with impellers selected to maximize dispersion while preventing short-circuiting.
Alternatively, a Dynamic In-Line mixer can be used, which is a high-speed mixer operating in a specially baffled section of similar-sized pipe as the process stream.
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