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Title:

Wastewater

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Wastewater Its Journey to Treatment and Return to the Environment Where does it all go! Where does the water from the washer go? When you flush the toilet where ... – PowerPoint PPT presentation

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Title: Wastewater


1
Wastewater Its Journey to Treatment and Return
to the Environment
2
Where does it all go!
Where does the water from the washer go?
By gravity flow, the waste is on its way to your
local wastewater treatment plant!
3
Why treat wastewater?
  • Causes a demand for dissolved oxygen (lower DO
    levels of streams)
  • Adds nutrients (nitrate and phosphate) to cause
    excessive growth
  • Increases suspended solids or sediments in
    streams (turbidity increase)

4
Levels of Treatment
  • Primary
  • removal by physical separation of grit and large
    objects (material to landfill for disposal)
  • Secondary
  • aerobic microbiological process (sludge)
  • organic matter O2 ? CO2 NH3 H2O
  • NH3 ? NO3-
  • lowers suspended solids content (into sludge)

Mostly dead microbes
aquatic nutrient
5
Secondary process
To tertiary process
From primary process
Settling collects sludge on bottom
Aeration and rapid mixing
air diffuser
6
Levels of Treatment continued
  • Tertiary (advanced)
  • anaerobic microbiological process with a
    different microbe where O2 is toxic (more sludge)
  • NO3- ? N2 (escapes to atmosphere)
  • PO4-3 if not removed in sludge in secondary
    process
  • PO4-3 Al3 ? AlPO4 (s) (into sludge)
  • - aeration to strip N2 and re-oxygenate (add DO)

7
Tertiary process
From secondary process
add methanol as food source
Effluent
Settling collects sludge on bottom
Slow mixing to keep suspended and O2 out
8
When the treatment is done
  • Effluent back to stream after
  • a final carbon filtration and
  • chlorination/dechlorination
  • Sludge very nutrient rich
  • applied directly to land as fertilizer
  • incinerated (good fuel after drying)
  • composted

9
(No Transcript)
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