Transcript Water treatment

Water use and treatment
5 Stages
Over view
4. Filtration
The ‘settled sewage’ is sprinkled
onto large circular beds, two
metres deep, filled with stones
or clinker.. bacteria and other
tiny creatures feed on the
organic material. This produces
a sludge which settles out in
special humus tanks.
5. Final Settling Tank
Small and fine particles
settle out leaving the cleaned
water, or effluent, to
flow back into rivers and
streams.
3
2. Grit and Sand
Channels .The
sewage then flows
along wide, deep
channels where
grit and sand sink
to the bottom.
2
4
5
3. Sedimentation Tank
Here, solid particles
in the sewage settle
at the bottom of the
tank to form a thick
sludge.
1
1. Screening
Metal screens
sieve out large
objects such as
wood, cans and
plastics.
Collection
Uses
Treatment
We all use water
Water in our
House
Collecting Water
Collecting Water
We all use water
Water in our
House