Wastewater from a small town is treated in a trickling filter which is preceded by a screen, sand-removal and primary clarification. The maximum hydraulic capacity, or peak flow, of the treatment plant is 1,500 m³/h. The dry weather flow (Qdwf) amounts 7,500 m³/day, with a BOD concentration of 300 mg/l. The maximum scouring velocity or slip velocity is 0.3 m/s and the maximum surface load or Hazen velocity is 40 m/h. Assume 4 channels. Take a W:L ratio of 1:15 Calculate the vertical surface area Avertical in m² Calculate the horizontal surface area Ahorizontal in m² Dimension the rectangular sand removal channels. Length (m): Width (m): Maximum water height (m): Allow a free waterboard of 15 cm and a maximum grit accumulation height of 20 cm. Give the total height in m of the grit channel. Calculate the liquid velocity during Qdwf (in m/s) in the channel.

Wastewater from a small town is treated in a trickling filter which is

1.	Wastewater from a small town is treated in a trickling filter which is preceded by a screen, sand-removal and primary clarification. The maximum hydraulic capacity, or peak flow, of the treatment plant is 1,500 m³/h. The dry weather flow (Qdwf) amounts 7,500 m³/day, with a BOD concentration of 300 mg/l. The maximum scouring velocity or slip velocity is 0.3 m/s and the maximum surface load or Hazen velocity is 40 m/h. Assume 4 channels. Take a W:L ratio of 1:15 Calculate the vertical surface area Avertical in m² Calculate the horizontal surface area Ahorizontal in m² Dimension the rectangular sand removal channels. Length (m): Width (m): Maximum water height (m): Allow a free waterboard of 15 cm and a maximum grit accumulation height of 20 cm. Give the total height in m of the grit channel. Calculate the liquid velocity during Qdwf (in m/s) in the channel.
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