The spacing of steel bars in coarse screens used for the treatment of sewage is 

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WBMSC Sub-Assistant Engineer (Civil) 05 Jun 2022 Official Paper
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  1. 10 mm
  2. 20 mm
  3. 30 mm
  4. 50 mm

Answer (Detailed Solution Below)

Option 4 : 50 mm
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Detailed Solution

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Explanation:

Screens:

A bar screen is a mechanical filter used to remove large objects, such as rags and plastics, from wastewater. It is part of the primary filtration flow and typically is the first, or preliminary, level of filtration, being installed at the influent to a wastewater treatment plant.

Spacing between bars 

Coarse screen = 50 mm or more

Medium Screen = 6 mm - 40 mm

Fine screen =1.5 mm - 3 mm

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