GATE CE 2021 Set 2 — Question 62
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Environmental Engineering → Wastewater Treatment Processes → Screening & Grit Removal
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Question
A grit chamber of rectangular cross-section is to be designed to remove particles with diameter of and specific gravity of . The terminal settling velocity of the particles is estimated as . The chamber is having a width of and has to carry a peak wastewater flow of giving the depth of flow as . If a flow-through velocity of has to be maintained using a proportional weir at the outlet end of the chamber, the minimum length of the chamber (in , in integer) to remove particles completely is ____________
Correct answer
9 to 9
Solution
Given data:
Settling velocity,
Flow-through velocity,
Depth of flow, For complete removal of particles, the detention time must be equal to the settling time:The minimum length of the chamber is .
Settling velocity,
Flow-through velocity,
Depth of flow, For complete removal of particles, the detention time must be equal to the settling time:The minimum length of the chamber is .
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