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In water treatment, the manual screens are kept inclined at an angle of 

In water treatment, the manual screens are kept inclined at an angle of  Correct Answer 45 - 60° with the horizontal

Explanation:

The slope of the hand-cleaned (or manual) screen should be between 45° to 60° with horizontal. The mechanically cleaned bar screens are generally erected almost vertical, however, the angle with the horizontal can be in the range of 45° to 85°.

Additional Information

Some important points about screens in the screening process

  • The coarse screen consists of parallel iron rods are placed vertically or at a slight slope at about 25 to 50 mm apart
  • The fine screen is usually made of woven wire mesh with an opening not more than 6 mm square
  • The spacing between two bars in medium size screen ranges from 15 to 40 mm
  • The clear spacing between the bars may be in the range of 15 mm to 75 mm in case of a mechanically cleaned bar screen
  • However, for the manually cleaned bar screen, the clear spacing used is in the range 25 mm to 50 mm

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