In a clarifier, how does flow velocity affect settling?

In a clarifier, how does flow velocity affect settling?

• A. Higher velocity resists settling, increases carryover, and reduces effluent clarity.
• B. Higher velocity resists settling but improves effluent clarity.
• C. Velocity has no effect on settling.
• D. Lower velocity improves settling, reduces carryover, and improves effluent clarity.

Answer: (D)