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1 Understanding Wastewater & Sewers Erie County Department of Environment & Planning Division of Sewerage Management.

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Presentation on theme: "1 Understanding Wastewater & Sewers Erie County Department of Environment & Planning Division of Sewerage Management."— Presentation transcript:

1

2 1 Understanding Wastewater & Sewers Erie County Department of Environment & Planning Division of Sewerage Management

3 2 Water Is our Most VALUABLERESOURCE MostValuable

4 3 Why is Water IMPORTANT ? Water is necessary to all living things People can live for weeks without food, but only a few days without water Water is a delivery system Nutrients in soil Blood in humans/animals Carries off bodily wastes Our body is water cooled

5 4 Why Conserve Water ? We have a limited amount of water and a growing population!

6 5 Who Uses Water ? People Industry Farmers Utilities (making electricity) Water used in 1 day in USA billion gallons 450,000,000,000 gallons ( >7 trillion cups )

7 6 How Much Water Do We Use and Where ?

8 7 Daily Water Usage Family & Industrial US Japan Ghana (W. Africa) All of Europe 450,000,000,000 gallons 150,000,000,000 gallons 6, 400,000,000 gallons 170,000,000,000 gallons Water Trivia: US needs 115,000,000,000 gals/day of drinking water

9 8 Goes down the drain What Happens to Water Thats Not Consumed ? DirtySmellyHidden } OOS/ OOM & and becomes wastewater

10 9 OOS/OOM Out Of Mind Out Of Sight

11 10 One Person, One Day: Flush Toilet Shower/Bath Brush Teeth Wash Hands 15 gal 35 gal 4 gal 4 gal 6 gal 6 gal (5 gal x 3 ) (2 gal x 2 ) (2 gal x 3 ) 60 gallons/person* JUNE 15, 2006 * Range: gallons/person-day

12 11 Typical Family Wastewater Total usage 14.5 billion gallons per day Dishwasher (2%) Kitchen Sink (8%) Bathroom Sink (11%) Bathing (20%) Washing Clothes (26%) Toilet (33%)

13 12 What Happens to the Wastewater From Each Source? Where does the drain pipe lead? Connects with other drains Series of house pipes Usually in the basement Goes down a DRAIN

14 13 Where Does It Go from There? W H E R E

15 14 Where Does It Go from There? S E W E R S

16 15 What is a SEWER? Series of pipes Below ground Conveys wastewater Sewer has access points House connections Manholes

17 16 What We Should NOT Put Into Sewers ? Paints Solvents Pesticides Storm water Oil Gasoline Plastics Grease PaintThinner

18 17 Why Not? Damage Sewers Corrosive Explosive Fire Block Sewers Difficult to remove Create odors Overload Treatment Plant Reduce Capacity

19 18 DAMAGED SEWERS

20 19 For Example: Blocked Sewer

21 20 Where Should We Put Them? Special Disposal Places (check with Erie County or local Town officials)

22 21 HOUSEHOLD WASTE DISPOSAL Erie County Household Hazardous Waste Drop-Off Day Contact: (716) Or

23 22 Wastewater Flow in Sewers Why is the sewer pipe tilted downward? –Water flows by gravity –From high point to low point Have you ever seen water run uphill?

24 23

25 24 How Do We Get Wastewater Up a Hill ? Sewer Pump PumpedWastewater(Uphill)Gravity Wastewater Flow (Downhill) Hill Sewer It needs to be PUMPED !

26 25 What is Sewer Pipe Made Of ? Clay Not Used - Old Pipe Metal Special Cases Concrete Larger Lines Plastic New- Most Common

27 26 Sewer Pipe Size Does one size sewer pipe fit all places NO Pipe size is increased as more wastewater is introduced from additional homes

28 27 Can You See Sewer Pipes ? No! How Do You Know They Are There ? ManholeCovers Streets Sidewalks Private Property Where

29 28 Can You See Sewer Pipes ? Look for the connection from your house to the sewer. Look for your Cleanout, its usually in you lawn.

30 29 Manholes - Why Do We Need Them ? Provide access to sewers to Look at Fix Clean Monitor/sample Join pipes Change direction/ pipe size/slope Provide venting

31 30 Sewer View From Above

32 31 Sewer View From Above Manhole Joining Pipe Increasing Pipe Size Changing Pipe Direction Increasing Pipe Size

33 32 What Happens at a Wastewater Treatment Plant ? Dirty water (called wastewater or sewage) is cleaned…. HOW ? Through treatment process by

34 33 But Why Send to a Treatment Plant Why Not Discharge to a River Or Lake

35 34 Why Not Discharge to a River or Lake? River/Lake Untreated wastewater will make humans sick Untreated wastewater will kill fish and other aquatic life. Impacts water quality

36 35 Why Not Discharge to a River or Lake? Major concern – BACTERIA/HEALTH & LOW OXYGEN LEVEL

37 36 Why Not Discharge to a River or Lake? Bacteria/pathogens are harmful Humans Fish Low Oxygen Level Fish cannot survive

38 37 Wastewater Treatment Plants Sewers discharge to wastewater treatment plants (WWTPs) WWTPs remove Bacteria/Pathogens Organic matter Solids WWTPs discharge Cleaner water BUT HOW?

39 38 Wastewater Treatment Plant Summary Bar Screen Grit Tank Solids Settling 123 Steps 5 4 Biological Treatment Disinfection Chlorine or Ultraviolet CleanWater

40 39 Step 1: Bar Screens

41 40 Bar Screens

42 41 Step 2 - Grit Removal Grit can be: Egg shells Coffee grinds Nut shells Seeds Sand Pebbles Pits

43 42 Grit Tank

44 43 Step 3 - Solids Settling

45 44 Step 3 - Solids Settling Solids can be: Food Poop Settling Tank Removes Solids from Wastewater

46 45 Solids Settling - Circular Clarifier

47 46 Solids Settling - Circular Clarifier

48 47 Step 4 - Biological Treatment Aeration tank removes soluble organic material from wastewater Hungry bugs eat organic material (food) Clean water is left

49 48 Aeration Tank

50 49 Step 5 - Disinfection Clean Effluent Clean Water Chlorine Contact Tank Chlorine Clean Effluent Clean Water (UV) Ultraviolet Bulbs -OR- Disinfection removes bugs from clean water before discharge Chlorine or ultraviolet light kills bugs

51 50 Disinfection (chlorine contact)

52 51 Disinfection (Ultraviolet)

53 52 Wastewater Treatment Plant Summary Bar Screen Grit Tank Solids Settling 123 Steps 5 4 Biological Treatment Disinfection Chlorine or Ultraviolet CleanWater

54 53 But What Do We Do With The Solids Collected? Bar Screen Grit Tank Solids Settling 123 Steps 5 4 Biological Treatment Disinfection Chlorine or Ultraviolet CleanWater

55 54 Dewatering Why? - To reduce amount of water in solids - To reduce disposal volume - More water in solids = more cost $$$

56 55 Plant Solids To Landfill Anaerobic Digester Solids Dewatering Primary Clarifier Solids Final Clarifier Solids

57 56 THE FINAL RESULT – CLEAN WATER & HEALTHY ENVIRONMENT

58 57 ECDSM


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