a brief history of wastewater - h2o'c1388: act of english parliament “forbade the throwing of...
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A Brief History ofA Brief History of
WastewaterWastewater
Tom O’Connor, PE
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OverviewOverview
Wastewater Characteristics
Wastewater Past
Outhouses and Toilets
Wastewater Treatment
Wastewater in India and Japan
Wastewater Future
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What is Wastewater?What is Wastewater?
Wastewater n. Water that has been used, as
for washing, flushing, or in a manufacturing
process, and so contains waste products;
sewage.
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Hydrologic CycleHydrologic Cycle
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Water and StuffWater and Stuff
H2O Pure Water
Natural Waters Water + Stuff
Drinking Water Natural Waters - Stuff
Wastewater Drinking Water + Stuff
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What is the Stuff inWhat is the Stuff in
Municipal Wastewater?Municipal Wastewater?
Stuff we put down the toilet or drain…
• Water
• Poop, urine, toilet paper, condoms, tampons…
• Food scraps, toothpaste, soap, hair, paint, chemicals…
…and stuff that just finds its way in.
• storm water
• wee beasties
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What is the Stuff inWhat is the Stuff in
Municipal Wastewater?Municipal Wastewater?
• Water ( > 95%)
• Pathogens (bacteria, viruses, prions and parasitic worms)
• Non-pathogenic bacteria
• Organic particles (feces, hairs, food, vomit, paper fibers, plant material)
• Soluble organic material (urea, fruit sugars, soluble proteins, drugs)
• Inorganic particles (sand, grit, metal particles, ceramics)
• Soluble inorganic material (ammonia, salt)
• Animals (protozoa, insects, arthropods, small fish)
• Macro-solids (sanitary towels, diapers, condoms, needles, children's toys,
dead pets, body parts)
• Gases (hydrogen sulfide, carbon dioxide, methane)
• Emulsions (paints, adhesives, mayonnaise, hair colorants, emulsified oils)
• Toxins (pesticides, poisons, herbicides)
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How Do We MeasureHow Do We Measure
Stuff in Wastewater?Stuff in Wastewater?
Biochemical Oxygen Demand
Total Suspended Solids
Nitrogen
Phosphorous
Chloride
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How Much of thisHow Much of this
Stuff is in Wastewater?Stuff is in Wastewater?
Biochemical Oxygen Demand 200
Total Suspended Solids 200
Nitrogen (total) 40
Phosphorous 10
Chloride 50
(mg/l)
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Evolution of Waste ManagementEvolution of Waste Management
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Evolution of Waste Management:Evolution of Waste Management:
Driving IssuesDriving Issues
#1. Smell
#2. Infectious Disease
#3. Chronic Health Risks
#4. Environmental Concerns
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Waste Management:Waste Management:
10,000 BC10,000 BC
Nomadic Tribes:
MOVE
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3500 BC3500 BC
City of Ur (Mesopotamian Capital in Iraq):
Swept waste into the streets
When street
level rises,
raise the doors
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2500 BC2500 BC
Indus Valley (Pakistan): Ahead of Their Time
• Drainage systems
• Some houses hadwater-flushing toilets
• Houses had rubbishchutes, and there wererubbish bins placedaround the city for refusedisposal
• Great leap in wastemanagement
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2100 BC2100 BC
City of Hierakopolis (Egypt)
Waste generally
swept into streets,
but rich & religious
people put waste
into rivers
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1700 - 1500 BC1700 - 1500 BC
King King Minos Minos of Crete, also ahead of his time--of Crete, also ahead of his time--
Running water in palace bathrooms,Running water in palace bathrooms,
Baths filled & emptied w/ clay pipesBaths filled & emptied w/ clay pipes
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320 BC320 BC
Athens (Greece):
First known edict banning disposal of refuse in the streets
300 BC: City collects waste, charges landowners
The early Greeks understood the
relationship between water quality and
general public health. This concern was
passed onto the Romans.
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600 BC - 400 AD600 BC - 400 AD
Ancient Rome
Aqueducts
Cloaca Maxima (the Great Sewers)
Waste to Rivers (Tiber, Rome)
Public Baths
Flush Toilets (not seen again until ~1600)
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Romans Raise the BarRomans Raise the Bar
• 11 public baths
• 1300 public fountains
• 856 private baths
• 144 public water-
flushed toilets
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The Fall of the Roman EmpireThe Fall of the Roman Empire
• End of running water in Europe for the next thousand years
• Depopulation, deurbanization
• Return to throwing waste into the streets
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500 - 1500 AD: Bad Times500 - 1500 AD: Bad Times
Drinking Water and Wastewater: Together Again
Raging epidemics, rampant disease and death
• dysentery, typhus, typhoid fever
• rats, ticks, fleas
Linkage between waste and disease forgotten
Rivers became sewers
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14th Century:14th Century:
Time to Do Something, But What?Time to Do Something, But What?
Following the major plagues of the 12th century,
waste management became a priority.
1388: Act of English Parliament “forbade the throwing of filth
and garbage into ditches, rivers, and water”
Legislation was ineffective, as offenders and offended alike
were unable to devise adequate alternatives to the available
methods of collection and disposal
Except for those in heavily polluted areas, popular opinion
was very much against such measures
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Renaissance: 1500-1700Renaissance: 1500-1700• Renewed awareness of the link between
sanitation and human health
• More laws about polluting streams
• Development of the Cesspool(pit that allows solids to settle and liquid to seep into the ground)
• Asphyxiation common due to
hydrogen sulfide, oxygen
deficiency
• Methane explosions
• Used “night soil” for fertilizer
• Small children harvested cesspit
wastes
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1700 - 18601700 - 1860
Chamber Pots into Street Gutters
Outhouses
Cesspools
Get it to the River
Increases in Awareness, Stagnation of Options
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ChamberChamber
PotPot
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Chamber PotsChamber Pots
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The OuthouseThe Outhouse
Latrine
Privy
Earth-closet
Dunny
Loo
Jake
Comfort Station
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Earth-Pit Earth-Pit
PrivyPrivy
Design Criteria
6 feet deep50 cu. ft.
“… lean-to roof hastwo less corners forthe wasps to buildtheir nests in…”
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Privy with a ViewPrivy with a View
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CharlesCharles
(Chic) Sales(Chic) Sales
The Specialist (1927)
“..dig her deep anddig her wide..”
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Two-StoryTwo-Story
OuthouseOuthouse
for two-storied houses
with two families
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Sears RoebuckSears Roebuck
Catalogs,Catalogs,
Newspapers, Newspapers,
and Corn Cobsand Corn Cobs
packaged toilet paper,introduced in 1857,
sold poorly
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Washington, Indiana, 1914Washington, Indiana, 1914Privy is 8’ from well & 10’ from kitchen.
Spring rains eroded deep hole around well
which was then used for disposal of rubbish
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Outhouses in AustraliaOuthouses in Australia
19501950
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New Zealand 2004 - New Zealand 2004 - Loo Loo with a Viewwith a View
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The Jet-Propelled OuthouseThe Jet-Propelled Outhouse
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The Space The Space ShittleShittle
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The Space The Space ShittleShittle
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The Out-in-the-OpenThe Out-in-the-Open
OuthouseOuthouse
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The The SanisetteSanisette
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Islam and the OuthouseIslam and the OuthouseQadaahul Haaja: Islamic Toilet Rules
• Say before entering the toilet: In the name of Allah, O Allah! I seek refuge with You from all offensive and wicked things
• One should enter the toilet with the left foot and leave with the right foot.
• It is not permissible to enter the toilet whilst carrying or wearing anything bearing the name of Allah, such as the Quran,
or any book with the name of Allah in it, or jewelry such as bracelets or necklaces engraved with the name of Allah.
• One should remain silent whilst on the toilet. Talking, answering greetings or greeting others is forbidden.
• One should not face nor turn your back on Mecca whilst relieving yourself. One should sit at 90 degrees.
• One should be out of sight of people when going to the toilet.
• It is forbidden to relieve oneself whilst standing up, lying down or if you are completely nude.
• One should avoid going to the toilet anywhere where people may take rest or gather for any purpose.
• Do not raise clothes until you get close to the ground and do not uncover the body any more than is needed.
• One should sit on the feet (e.g. squat) keeping thighs wide apart with the stress on the left foot.
• Do not look to the private parts of the body nor the waste matter passed from the body.
• Do not sit more than needed.
• Do not spit, blow nose, look hither and thither, touch the body unnecessarily nor look towards the sky but relieve oneself
with the eyes downcast in modesty.
• After relieving oneself it is essential to perform Istinjaa (washing with water) of the anus and/or genitals with the left hand
and water. The precise mode of performing Istinjaa has also been defined by religious leaders.
• Other than toilet paper, water and the left hand Istinjaa can be performed with earth, grit, stones and worn-out cloths
provided they are all clean. It is forbidden to perform Istinyaa with bone, any edible item, dry dung, baked brick, potsherd,
coal, fodder, writing paper and anything which has even a small value.
• After this process the hands should also be washed.
• When leaving the toilet one should say the following prayer: Praise be to Allah who relieved me of the filth and gave me
relief.
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Meanwhile,Meanwhile,
Back in the 19th CenturyBack in the 19th Century……
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CholeraCholeraWorldwide epidemic
in 19th Century
1832 in New York
1854 in London
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Wastewater TreatmentWastewater Treatment
• Screen
• Settle
• Skim
• Accelerate Natural Biological Processes
• Destroy Pathogens
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1919thth Century Century
1860 Louis Moureas invents the septic tank
• Allows solids to settle out before liquid is
discharged to the nearest stream or river
• Used for communities
• People also experimented with sand filters
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Septic TankSeptic TankInvented by Louis Moureas in 1860
• Large scale: used totreat sewage fromcommunities
• Purpose: “To removegross solids beforedischarge into thenearest stream orriver.”
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Septic TankSeptic Tank
Unit Capacity:
4 to 16 people
500 - 2000 gallons
90 – 300 cubic feet
1–3 compartments
L/W: 3/1; D: 4-6 ft.
Scum, gas baffles
PVC Filter Vault
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Sub-SurfaceSub-Surface
DisposalDisposalGravel-filled Trenches
Open-Joint Tiles
Infiltration to Ground
Biological Slime Formation
Mineral Precipitates, FeS
Release of Gases, H2S, CH4
Soil Acceptance Rate
0.3 to 0.5 gpd/sf
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New York City: Early 1800New York City: Early 1800’’ss
Drinking water from wells and cisterns
Private waste disposal (privies for temporary
storage) “vault and haul”
Belief: running water purifies effluent
Potential for water pollution not recognized
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Sewers initially developed for
storm water
Limited water supply made
water-based disposal
unworkable
Water brought in by aqueduct
Sewers improved to handle
new influx created by more
water use
Connecting all houses to
sewers took awhile
Connections achieved by
public funding pushed by
public health concerns
New York City: Late 19New York City: Late 19thth Century Century
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19001900Toilets and Water Carriage:Toilets and Water Carriage:
The Birth of SewageThe Birth of Sewage
Valveless Water Waste Preventer (aka toilet)
Indoor Plumbing
Demise of the Outhouse
Early Disposal of ‘Flushings’
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IndoorIndoor
PlumbingPlumbingcirca 1900
to eliminate disease,
fumes, explosions
T. J. Crapper’sValveless WaterWaste Preventer
“Pull and let go!”
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Ventilation of HouseDrains
Air Pump and SmokeGenerating Machines
Disconnecting Trapsfor Safety Purposes
Self-Rising ClosetSeats
Cantilever Toilet
Flusherette Valve
Stair Treads
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United StatesUnited States
PopulationPopulation
1910: 92 million38% sewered89% of wastedischargeduntreated
1968: 197 million70% sewered
11% untreated
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Sewered Sewered PopulationPopulation
0
50
100
150
200
250
1840 1860 1880 1900 1920 1940 1960 1980
U.S. Population
Sewered Popul.
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Disposal Systems Disposal Systems –– 1910 1910
Unsewered Unsewered HouseholdsHouseholds
Residential Waste Disposal
Waste Quantities and Strength
Evolution of the Septic Tank
Soil Absorption Systems
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Residential Flow RatesResidential Flow Rates
Residences* gallons/person/day
Low Income 50Median 60Luxury 80
Peak Flow FactorsMonth 2Day 4Hour 6
* Average: 3 residents per household
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Residential Water UseResidential Water Use
Household Use gallons / day
Laundry 25
Dishwashing 10
Miscellaneous 5
Personal (per capita) Use
Bathing 20
Toilet Flushing 17
Cooking and Drinking 3
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On-Site Treatment and Disposal
Flow Range: 0.2 to 2 m3/ day
Septic Tanks (Settling; Fermentation)1 to 2 day retention; 2 meters deep
scum, sludge removal every 6 to 12 months
sludge to lagoons, earth-covered trenches
or plowed into land after partial drying on surface
Soil absorption systems for tank overflow
Unsewered Unsewered SystemsSystems
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Waste DisposalWaste Disposal
1920-19501920-1950
Sewage Collection (Sewerage)
Sewage Treatment:
Imhoff Tanks
Primary Treatment
Chemical Precipitation
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Karl Karl ImhoffImhoff
Sewers: Open ditches with concrete slabs
Two-Storied Settling and Digestion Tanks
The Arithmetic of Sewage Treatment Works
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US Public Health ServiceUS Public Health Service
Training Slides from 1950Training Slides from 1950
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Imhoff Imhoff Tank Treatment PlantTank Treatment Plant
Population: 1000 40,000 gpd
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![Page 68: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/68.jpg)
Manually-Cleaned Bar RackManually-Cleaned Bar Rack
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Imhoff Imhoff TankTankSettling Compartments and Gas VentsSettling Compartments and Gas Vents
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![Page 71: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/71.jpg)
Gas Rising from Gas VentGas Rising from Gas Vent
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Raw Sludge Drying BedsRaw Sludge Drying Beds
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50% Suspended Solids Removal
50% Reduction in Oxygen Demand
Sewage EffluentSewage Effluent
entering Streamentering Stream
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Primary SettlingPrimary Settling
and Disinfectionand Disinfection
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![Page 76: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/76.jpg)
Primary TreatmentPrimary Treatment 4,500 / 0.5 4,500 / 0.5 mgdmgd
Prechlorination (odor control)
Primary Clarifiers
Chlorine Contact Chamber
Heated Sludge Digester
Sand Drying Beds
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Prechlorination Prechlorination and Samplingand Sampling
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Dual, Manually-Cleaned Bar ScreensDual, Manually-Cleaned Bar Screens
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Rectangular, Mechanically-Cleaned ClarifiersRectangular, Mechanically-Cleaned Clarifiers
![Page 80: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/80.jpg)
Scum RemovalScum Removal
![Page 81: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/81.jpg)
Chlorine Contact ChamberChlorine Contact Chamber
![Page 82: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/82.jpg)
Effluent SamplingEffluent Sampling
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Imhoff Imhoff ConesCones
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Heated Sludge DigesterHeated Sludge Digester
![Page 85: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/85.jpg)
• Anaerobic conditions
• Volatile solids converted to CO2 and methane
Floating CoverFloating Cover
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Digested Sludge Goes toDigested Sludge Goes to
Sand Drying BedsSand Drying Beds
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Chemical TreatmentChemical Treatment
![Page 88: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/88.jpg)
Grit Removal,Grit Removal,
ComminutionComminution
![Page 89: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/89.jpg)
Lime + Ferric ChlorideLime + Ferric Chloride
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Sludge TreatmentSludge Treatment
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LimeLime
FeederFeeder
![Page 92: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/92.jpg)
LimeLime
FeedFeed
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Ferric ChlorideFerric Chloride
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FeClFeCl33 + Lime Feed + Lime Feed
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Chemical Treatment BasinChemical Treatment Basin
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Coagulated SewageCoagulated Sewage
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Ph
ysic
al
Tre
atm
en
tP
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Tre
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So
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ova
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Activated Sludge PlantActivated Sludge Plant
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Aeration TanksAeration Tanks
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Covered Drying BedsCovered Drying Beds
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Return Sludge, Mixed LiquorReturn Sludge, Mixed Liquor
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Plant PerformancePlant Performance
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Pollution Control LegislationPollution Control Legislation
1948 Water Pollution Control Act
1956 Fed. Water Pollution Control Act
1961 Amendments to FWPCA
1965 Water Quality Act
1966 Clean Water Restoration Act
1970 USEPA Established
1972 FWPCA Approved
1981 Construction Grants Amendments
1987 Water Quality Act
![Page 105: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/105.jpg)
Secondary TreatmentSecondary Treatment
Activated Sludge
Trickling Filters
Rotating Biological Contactors
![Page 106: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/106.jpg)
Trickling FiltersTrickling Filters
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Trickling FiltersTrickling Filters
• Bed of rocks, fist size (lots of air spaces)
• Water from primary treatment trickles over rocks
• Rocks coated with slime of aerobic organisms
• Bacteria aerobically digest organic solution
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Rotating Biological ContactorsRotating Biological Contactors
• Bed of rocks, fist size (lots of air spaces)
• Water from primary treatment trickles over rocks
• Rocks coated with slime of aerobic organisms
• Bacteria aerobically digest organic solution
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Rotating Biological ContactorsRotating Biological Contactors
• Bed of rocks, fist size (lots of air spaces)
• Water from primary treatment trickles over rocks
• Rocks coated with slime of aerobic organisms
• Bacteria aerobically digest organic solution
![Page 110: A Brief History of Wastewater - H2O'C1388: Act of English Parliament “forbade the throwing of filth and garbage into ditches, rivers, and water” Legislation was ineffective, as](https://reader030.vdocument.in/reader030/viewer/2022011913/5fae27f07a00c8151446927a/html5/thumbnails/110.jpg)
After 1972:After 1972:Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
Standard plug flow activated sludge
Organic load and oxygen demand are uniform throughout the tank
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge• Influent introduced at multiple points
• Equalizes the food to microorganism ratio (F/M)
• Lowers peak oxygen demand
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Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
Process OptimizationProcess Optimization
• Separate aeration of activated sludge
• Aeration requirements reduced by 50%
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge • low organic loading
• long aeration time
• small, prefabricated package plants
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
• Ring or oval-shaped channel
• Mechanical aeration and circulation devices
• Extended aeration
• Long detention times
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
• Variation of Step Aeration process
• Used for WW with low nitrogen levels
• Sludge digester supernatant added to
RAS as nutrient source
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Process OptimizationProcess Optimization
Complete Mix Activated Sludge
Step Aeration
Contact Stabilization
Extended Aeration
Oxidation Ditch
Kraus Process
Pure-Oxygen Activated Sludge
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Pure Oxygen Activated SludgePure Oxygen Activated Sludge
• High-purity oxygen is used instead of air in the activated sludge process
• Series of complete mix reactors with gas recirculation compressors
• Used with high-strength waste and limited available space
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New Treatment Goals andNew Treatment Goals and
Advanced Waste TreatmentAdvanced Waste Treatment
Disinfection
Dechlorination
Trickling Filters
Rotating Biological Contactors
Phosphorous Removal
Ammonia Removal
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Advanced Waste TreatmentAdvanced Waste Treatment
Phosphorus Removal
Ammonia Removal
Wetlands
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Phosphorus RemovalPhosphorus Removal
Biological Removal
Lime Precipitation
Aluminum Sulfate Flocculation and Precipitation
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Phosphorus RemovalPhosphorus RemovalPhosphorus is Food for Algae
Biological Removal: Manipulation of conditions
to maximize biological uptake of phosphorus
(“luxury uptake”)
Lime Precipitation
Aluminum Sulfate Flocculation and Precipitation
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Phosphorus RemovalPhosphorus Removal
Biological Removal
Lime Precipitation: High pH precipitates CaCO3, P
Aluminum Sulfate Flocculation and Precipitation
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Phosphorus RemovalPhosphorus Removal
Biological Removal
Lime Precipitation
Aluminum Sulfate Flocculation and Precipitation:
Precipitates aluminum phosphate
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Ammonia (Nitrogen) RemovalAmmonia (Nitrogen) RemovalIt’s Algae Food, Too
Physical Removal
• sedimentation • gas stripping
Chemical Removal
• breakpoint chlorination • ion exchange
Biological Removal
• activated sludge process • trickling filter
• rotating biological contactor • oxidation pond
• land treatment processes (overland flow)
• wetland treatment systems (Hyacinth cultures)
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WetlandsWetlands
• Water flows
through ponds
(wetland cells)
• Nutrients are
taken up by cattails
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Effluent DisinfectionEffluent Disinfection
To inactivate waterborne pathogens
(typhoid, dysentery, cholera, etc.)
1900: 25,000 typhoid deaths
1960: 20 typhoid deaths
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Disinfection ofDisinfection of
WastewatersWastewaters
Chlorine
Ultraviolet Light
Chorine Dioxide
Ozone
Bromine
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Chlorine DosagesChlorine DosagesMDNR Design Guide
Type of Treatment chlorine, mg/l
Trickling Filter Plant 10
Activated Sludge Plant Effluent 8
Tertiary filtration effluent 6
Nitrified Effluent 6
(15 minutes minimum contact time)
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WhyWhy Dechlorinate Dechlorinate??
To protect aquatic life
Persistent chloramine - toxicity to fish:
Resistant species < 0.01 mg Cl/l
Trout, salmon < 0.002 mg Cl/l
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DechlorinationDechlorination
Reducing agents:
sulfur dioxide SO2
sodium bisulfite NaHSO3
sodium sulfite Na2SO3
sodium thiosulfate Na2S2O3
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UV DisinfectionUV Disinfection
I already talked about it this morning.
It’s pretty cool.
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IndiaIndia
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JapanJapan
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Population DensityPopulation Density
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Lake Lake BiwaBiwa
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Lake Lake Biwa Biwa EnvironmentalEnvironmental
Monitoring StationMonitoring Station
Lake Biwa
• Japan’s largest lake
• Water source for 14 million people
• Ordinance Concerning the Prevention of
Eutrophication of Lake Biwa (1979)
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Ordinance Concerning the Prevention ofOrdinance Concerning the Prevention of
Eutrophication Eutrophication of Lakeof Lake Biwa Biwa (1979)(1979)
• prohibited detergents containing phosphorus
• regulated wastewater from factories
• expansion and improvement of sewer system
• advanced treatment of sewage to remove nitrogen and phosphorus
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Hello, TotoHello, Toto
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TitleTitle
Words
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Konan-ChubuKonan-ChubuWater Reclamation PlantWater Reclamation Plant
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Konan-ChubuKonan-ChubuWater Reclamation PlantWater Reclamation Plant
Built on a reclaimed island using dredged soil
Treatment Method: Nitrified Liquor Recycle Single-Stage
Nitrification/Denitrification Process with Coagulant Addition
and Sand Filtration
Present Capacity: 50 MGD
Design Capacity: 209 MGD
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Plant PerformancePlant Performance
98.8%0.043.38Total P
82.6%5.431.1Total N
94.0%5.694.5COD
99.7%0.6184TSS
99.6%0.7180BOD
REMOVALEFFLUENTINFLUENTmg/l
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TitleTitle
Words
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Konan-Chubu PlantKonan-Chubu Plant
Flow DiagramFlow Diagram
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Control RoomControl Room
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TitleTitle
Words
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TitleTitle
Words
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TitleTitle
Words
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TitleTitle
Words
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TitleTitle
Words
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TitleTitle
Words
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Covered GravityCovered Gravity
ThickenerThickener
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Sludge DehydratorSludge Dehydrator
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Kerosene FurnacesKerosene Furnaces
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SlagSlag
• Strength equivalent to natural stone
• TCLP (Leaching test) < detection levels
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Words
SlagSlag
Concrete pipes
Blocks
Bricks
Pavers
Aggregate
Backfill
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Advanced Waste TreatmentAdvanced Waste Treatment
TechniquesTechniques
“Advanced waste treatment techniques in use or
under development range from biological treatment
capable of removing nitrogen and phosphorus to
physical-chemical separation techniques such
filtration, carbon adsorption, distillation, and reverse
osmosis.”
-EPA, May 1998
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The Future ofThe Future of
Wastewater ManagementWastewater Management
Don’t make so much?
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Graywater Recycle Systems
Composting Toilets
Solar Toilets
Sawdust Toilets (bucket and chuck it)
Incinerating Toilets
Urine Diversion Toilets
How to Not Make So MuchHow to Not Make So Much
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Graywater Recycle Systems: Water from bath,
shower, washing machines, bathroom sinks is
used for irrigation
GraywaterGraywater
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Composting Toilets
The The Humanure Humanure HandbookHandbook
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Sawdust Toilets
Bucket and Chuck ItBucket and Chuck It
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Solar ToiletSolar Toilet
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The Future ofThe Future of
Wastewater ManagementWastewater Management
Don’t make so much?
When we’re forced to.
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A Brief History ofA Brief History of
WastewaterWastewater
Tom O’Connor, PE
H2O’C Engineering
877-22-WATER