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Wastewater Treatment
Technology Tutorial
Screening
Screening is the first technique employed in
the wastewater treatment process.
This step removes all sorts of refuse that has arrived
with the wastewater such as plastic, branches, rags,
and metals. The screening process is used primarily
to present the clogging and interference of the following
wastewater treatment processes.
Screens are considered coarse if their opening are
larger than 6mm, fine if their opening are between 1.5
and 6mm, and very fine if their openings are between
.2 and 1.5mm.
 
This type of screen, called a bar screen, removes
debris from wastewater.
Image from University of
Maryland, Civil
and Environmental Engineering.
Screens are cleaned manually if the object caught is
larger and mechanically if finer particles are caught.
The angle of the screen may also be varied to affect
the efficiency of filtration.
For more information:
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