Parameter & design criteria*

Equation* & obtained value

Design flow, Q_peak = 82,500 m³/day

No. of grit chamber in unit = 2

Detention time, D.T = 3 min

Depth: width = 1: 1.2

Depth = 3 m

$\begin{array}{l}\text{Volumeofeachtank}\\ =Q_{peak}\ast \text{D}\text{.T}/2=86{\text{m}}^3\end{array}$

Width = 3.6 m

Length = 8 m

The air-supply requirement = 0.3 m³/min/m

$\text{totalAirRequirement}=4.8{\text{m}}^{\text{3}}/\text{min}$

Quantity of grit to be removed = 0.015 m³/10³m³ at Q_ave

$\text{Totalvolumeofgrit}=0.45{\text{m}}^3/\text{d}$