Design an aerated grit chamber system to treat a 1 day sustained peak hourly flow of 3.40m3/s with an average flow of 2.50m3/s. Determine: (a) the grit chamber volume (assuming two chambers will be used); (b) the dimensions of the two grit chambers; (c)the average hydraulic retention time in each grit chamber; (d) air requirements, assuming 0.4 m3/m-min of air; and (e) the quantity of grit removed at peak flow, assuming a typical value of 0.02 m3/103m3 of grit in the untreated wastewater. The details of the design information used to size the aerated grit chambers are shown in Table Q2. Table Q2. Design information used to size aerated grit chambers Parameter Value / Range Peak flow detention time (min) 4 Depth (m)
Design an aerated grit chamber system to treat a 1 day sustained peak hourly flow of 3.40m3/s with an average flow of 2.50m3/s. Determine: (a) the grit chamber volume (assuming two chambers will be used); (b) the dimensions of the two grit chambers; (c)the average hydraulic retention time in each grit chamber; (d) air requirements, assuming 0.4 m3/m-min of air; and (e) the quantity of grit removed at peak flow, assuming a typical value of 0.02 m3/103m3 of grit in the untreated wastewater. The details of the design information used to size the aerated grit chambers are shown in Table Q2. Table Q2. Design information used to size aerated grit chambers Parameter Value / Range Peak flow detention time (min) 4 Depth (m)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Design an aerated grit chamber system to treat a 1 day sustained peak hourly flow of 3.40m3/s with an average flow of 2.50m3/s. Determine: (a) the grit chamber volume (assuming two chambers will be used); (b) the dimensions of the two grit chambers; (c)the average hydraulic retention time in each grit chamber; (d) air requirements, assuming 0.4 m3/m-min of air; and (e) the quantity of grit removed at peak flow, assuming a typical
value of 0.02 m3/103m3 of grit in the untreated wastewater. The details of the design information used to size the aerated grit chambers are shown in Table Q2.
Table Q2. Design information used to size aerated grit chambers
| Parameter | Value / Range |
| Peak flow detention time (min) | 4 |
| Depth (m) | 3 |
| Length (m) | 7.5-20 |
| Width (m) | 2.5-7 |
| Width-to-depth ratio | 2:1 |
| Length-to-width ratio | 3:1 to 5:1 |
| Air requirement per length of tank (m3/m-min) | 0.4 |
| Quantity of grit (m3/103 m3) | 0.02 |
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