9. A treatment plant has a horizontal flow sedimentation basin with a depth of 4 m, width of 6 m,length of 36 m, and process flow rate of 450 m^3/h.

Particle density is 2650 kg/m^3. Water temperature is 10°C. What removal percentage should be expected for particles that have settling velocities of 1.0 and 2.5 m/h?а. b. What is the minimum size of particles that would be completely removed?