Flash Mixer
The purpose of the mixing operation, in addition to the rapid mixing of chemical drugs with water, is the uniform distribution of the drug in water in order to destabilize the colloids. This is done in a quick mixing unit by adding coagulants to the raw water and stirring it. Rapid mixing is generally the first refining process. This step is necessary for fast and complete mixing of the coagulant, and not mixing completely increases the turbidity of the effluent and increases the consumption of scaling agent. The most important factors influencing coagulation are: type of coagulant, injection rate, solution concentration, pH changes, stirring speed and duration, water temperature, amount and size of suspended solids.
The influence of various factors on the coagulation phenomenon and the complexity of the mechanisms of action has caused that there is no coherent and generally accepted theoretical basis for the design of this unit. The most well-known theoretical basis for acceleration design is based on camp and velocity gradient studies.
