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4.1.1 Bar Screens
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4.1.1 Bar Screens

Description:
Description:
Information

Bar Screen

A screen is a device with openings, generally of uniform size, that is used to retain solids in the influent wastewater to the treatment facilities. A bar screen uses parallel bars as the screening element to remove coarse solids in raw wastewater.

 

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Figure 4.1 Schematic diagram of a bar screen

(Source: 3D Warehouse)

 

 

Design Criteria:

 

  • The approach velocity in the channel with the screen shall be less than 1 m/s. Low flowrate may result in sedimentation of coarse materials in the channel, while high flowrate will increase the head loss or force screenings passing through the bars.
  • The spacing of the bars should be 15 to 25 mm.
  • The bars should be inclined to 60 degrees to the horizontal.
  • The screen should be designed to allow for easy daily cleaning.

 

Operation and Maintenance:

 

  • Required regular inspection and cleaning to avoid unpleasant odor from the degradation of accumulated materials.
  • The screenings, normally consists of leaves, branches, plastic bags, toilet papers etc., can be disposed with domestic solid waste in an environmentally sound way.

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