Detritus Chamber)

Removal of grit (Grit/Detritus Chamber)

Removal of grit (Grit/Detritus Chamber)
The detritus chamber removes heavy inorganic matter like grit, sand, gravel, road scrapings and ashes. These particles are discrete particles that do not decay but create nuisance. They may injure pumps and make sludge digestion difficult. Grit particles are of large size and hence high density compared to organic matter. Thus, they are removed by differential settling.

Grit particles (0.20 mm) settle at a velocity of 1.2 m/min whereas suspended solids (faeces) have considerably lower settling velocities. The grit settles 30 cm in 16 sec, if the velocity is 30 cm/sec and the detention period is 1 min. Length of the tank should be 18 m. Storage space is provided at the bottom of the tank such that the clearing period in verage is 2 weeks.

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