Page 458 - Civil Engineering Formulas

384 CHAPTER THIRTEEN

Length of grit chamber (ft) (volume)/[(width, ft) (depth, ft)] (13.86)

Length-width ratios range from 3:1 to 5:1.
The air supply requirement for an aerated grit chamber ranges from 2.0 to
3
3
5.0 ft /min/ft of chamber length (0.185 to 0.46 m /min m).
3
(chosen air supply, ft /min/ft)
3
Air supply required (ft /min) (13.87)
chamber length, ft
Grit quantities must be estimated to allow sizing of grit handling equipment
such as grit conveyors and grit dewatering equipment. Grit quantities from an
3
3
aerated grit chamber vary from 0.5 to 27 ft /Mgal (3.74 to 201.9 m /L) of flow.
3
3
Volume of grit (ft /day) (assumed grit quantity, ft /Mgal)
(Mgd handled) (13.88)