Find the length of a settling chamber needed to collect 90% of 50 um particulates (pp= 1.2 g/cm). The chamber is 2 m wide and 4 m tall. The air flow rate is 25 m'/sec, and it is at 20 °C and 1 atm.

A single media filter has a 720mm deep bed of sand (diameter = 5 x 10^-4 m, shape factor = 0.8). The porosity of the system is 0.40. The filtration rate is 1.2 (L/s)m^2. The water viscosity is 1.14 x 10^-6 m^2/s. A. What is the Reynold’s number of the filter B. What is the friction factor for the filter? C. What is the total clean head loss across the filter in m?

A water treatment plant is required to process 28800 m³/d or raw water (density = 1000 kg/m³, kinematic viscosity = 106 m²/s). The rapid mixing tank imparts a velocity gradient of 900 s¹ to blend 35 mg/l of alum with the flow for a detention time of 2 minutes. The power input (W) required for rapid mixing is..

Q-Surface Overflow Rate (SOR) of a primary settling tank (discrete settling) is 20000 litre/m² per day. Kinematic viscosity of water in the tank is 1.01 × 10-2 cm²/s. Specific gravity of the settling particles is 2. Acceleration due to gravity is 9.81 m/s2. The minimum diameter (in um, round off to one decimal place) of the particles that will be removed with 80% efficiency in the tank, is.