Sewage

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Sewage
Treatment
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A day in the life of your waste water...
It All Starts Here...
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collects in sewer pipes...
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and arrives at your local waste water treatment
facility.
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PRIMARY
TREATMENT
Removes 40-50 of the solids
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Removal of Solids
Chunks of debris, sticks, sand, etc get caught
on the bar screens as the sewage enters the plant.
Step 1 in the Waste Water Treatment Process
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Next, it goes into the grit chamber sand, grit
and heavy solids settle to the bottom
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Primary Sedimentation Tank Smaller particles
settle scrapers collect the solid matter plus
scum or grease floating on top of the tank
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SECONDARY TREATMENT
85-90 of pollutants are removed
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The 1st step is AERATION...
Microorganisms and oxygen are mixed with the
wastewater. Air speeds the growth of the bacteria
which eat the waste matter.
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Solids clump together (activated sludge) and
settle out for reuse in the aeration tanks.
Followed by... SECONDARY SEDIMENTAITON
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CHLORINE
Added as a disinfectant before the wastewater
leaves the plant to kill disease-causing organisms
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Were not done yet!

• What do you do with all of the ...
• You know
• The S Word
• NO!
• SLUDGE!

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Digesters

• The purpose of sludge treatment is to destroy the
  pathogens
• Huge tanks in which the sludge is stored to allow
  it to continue to decompose (15-30 days)
• Aerobic digestion (treatment) consists of
  continuously pumping compressed air into a tank
• Anaerobic bacteria present in the waste convert
  much of the waste materials to carbon dioxide and
  methane (natural) gas

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Burn it in specially designed plants to prevent
air pollution
Now...what to do with the sludge?
A source of methane for powering small power
plants
Bury it in approved landfills
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What if you are not connected to a sewer line?
then you have a SEPTIC SYSTEM
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The Dos and Donts of Septic Maintenance

• Do
• Inspect your tank for signs of sludge buildup.
• Pump your tank every 2-3 years.
• Keep a grease can handy.
• Protect your system from vehicles and encroaching
  trees and shrubs.
• Install water saving devices to conserve water.
• Use non-toxic cleaning products such as baking
  soda to scrub toilets, or boiling water to help
  clear clogged drains.

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The Dos and Donts of Septic Maintenance

• Don't
• use a garbage disposal - it adds 50 more solids
  to your system.
• pour automotive oil, cooking oil, grease or paint
  or paint thinner down the drain.
• drive vehicles over the septic system/fields.
• plant bushes or trees over the leach field.
• use too much water, especially during rainy, wet
  seasons when the ground is saturated.
• use drain cleaners and other toxic chemical
  products.
• use chemical or biological septic system cleaners
  which can plug up leach fields and ruin your
  system.