The device used for quick, uniform dispersal of a chemical throughout a liquid is called:

The device used for quick, uniform dispersal of a chemical throughout a liquid is called:

• A. Stirrer
• B. Flash mixer
• C. Diffuser
• D. Aerator

Answer: (B)

The main idea here is distributing a chemical rapidly and evenly throughout a liquid. A flash mixer is designed for this exact purpose: it creates a high-shear, high-turbulence zone that quickly disperses the chemical so its concentration becomes uniform in a very short time. This rapid, uniform mixing is essential before the next treatment step (like flocculation or settling) to ensure the chemical reacts consistently throughout the flow. A stirrer can mix, but it doesn’t provide the intense, rapid dispersion needed for chemicals added to large volumes. A diffuser releases gas bubbles, which is about gas transfer rather than distributing a liquid chemical. An aerator also focuses on introducing air and improving oxygen transfer, not on dispersing added chemicals uniformly.

The main idea here is distributing a chemical rapidly and evenly throughout a liquid. A flash mixer is designed for this exact purpose: it creates a high-shear, high-turbulence zone that quickly disperses the chemical so its concentration becomes uniform in a very short time. This rapid, uniform mixing is essential before the next treatment step (like flocculation or settling) to ensure the chemical reacts consistently throughout the flow.

A stirrer can mix, but it doesn’t provide the intense, rapid dispersion needed for chemicals added to large volumes. A diffuser releases gas bubbles, which is about gas transfer rather than distributing a liquid chemical. An aerator also focuses on introducing air and improving oxygen transfer, not on dispersing added chemicals uniformly.