Wastewater Treatment

1,623 views

Published on

Published in: Technology
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,623
On SlideShare
0
From Embeds
0
Number of Embeds
11
Actions
Shares
0
Downloads
227
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

Wastewater Treatment

  1. 1. Outline of Wastewater Treatment
  2. 3. 1 Screening Three course screens collect debris such as rags, plastics and larger solids. The screenings got to the landfill.
  3. 4. 2 Pre-aeration & grit removal Air is pumped into the pre-aeration tank where grit falls out of suspension into a collection hopper.
  4. 5. 3 Sedimentation Three 40 metre long sedimentation tanks allow heavy solids to settle to the bottom and fats, oils and greases to rise to the top. About 60% of solid matter is removed at this point.
  5. 6. 4 Aerated lagoons Air is pumped into the lagoons by large paddle aerators to provide oxygen to help microbiological organisms grow and consume the organic material as a food supply
  6. 7. 5 Phosphorus removal A new facility to reduce the phosphorus in the wastewater. Alum will be added so that dissolved phosphorus settles out as sludge.
  7. 8. 6 UV disinfection Banks of ultra violet lamps mounted in the wastewater channel emit light of a wavelength that kills 99.9% of bacteria as the wastewater flows past.
  8. 9. 8 Outfall structure This distributes the discharge along 50m of rock embankment providing better mixing and a more aesthetic interface with the river. 7 Wetland pond and land passage This facility allows the flow to pass through a wetland pond and a rock land passage before entering the river. It also provides addition storage for wastewater at high river levels and some extra treatment.
  9. 10. 9 Sludge digesters Sludge is held in digesters for 20 days at 35°C. Anaerobic breakdown occurs producing a more stable and more easily dewatered sludge.

×