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Sewage Treatment.

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Presentation on theme: "Sewage Treatment."— Presentation transcript:

1 Sewage Treatment

2 A day in the life of your waste water...
It All Starts Here...

3 …collects in sewer pipes...

4 …and arrives at your local waste water treatment facility.

5 Removes 40-50% of the solids
PRIMARY TREATMENT Removes 40-50% of the solids

6 Step 1 in the Waste Water Treatment Process
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

7 Next, it goes into the grit chamber
sand, grit and heavy solids settle to the bottom

8 Primary Sedimentation Tank Smaller particles settle;
scrapers collect the solid matter plus scum or grease floating on top of the tank

9 85-90% of pollutants are removed
SECONDARY TREATMENT 85-90% of pollutants are removed

10 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.

Solids clump together (activated sludge) and settle out for reuse in the aeration tanks. Followed by... SECONDARY SEDIMENTAITON

12 CHLORINE Added as a disinfectant before the wastewater leaves the plant to kill disease-causing organisms

13 We’re not done yet! What do you do with all of the ... You know…
The ”S” Word NO! SLUDGE!

14 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

15 Now...what to do with the sludge?
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

16 What if you are not connected to a sewer line?
…then you have a SEPTIC SYSTEM

17 Leeching Fields

18 The Dos and Don’ts of Septic Maintenance
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.

19 The Dos and Don’ts of Septic Maintenance
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.

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