CE520 Treatment Plant Design

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CE520 Treatment Plant Design
Water Treatment
Wastewater Treatment
City of Columbus
City of Toronto
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HISTORY OF DRINKING WATER TREATMENT
Alum and RSF(1885)
Lime Soda Softening(1903)
Chlorination(1908)
Reverse Osmosis(2003)
GAC(1930)
Hyatt Filter(1880)
PAC(1929)
1900
1840
1950
2000
PhACs in surface water(2002)
Silent Spring(1962)
SDWA(1974)
Cholera kills 3500 NYC(1842)
Rook discovers DBPs(1974)
1063 due of Typhoid in Philidelphia(1900)
SOCs linked to cancer in Mississippi R.(1974)
400,000 sick in Milwaukee(1993)
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Drinking Water Treatment Plant
Ultrafiltration
NF or RO
Raw water
Backwash Wastewater
PAC
Coagulation and Flocculation
Screening
Sedimentation
Filtration
Disinfection
Fluoride
Sludge Disposal
Corrosion inhibitor
Distribution System
Lime Soda Softening
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Screening
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Coagulation/Flocculation
Chemical Addition
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www.cee.umd.edu
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Sedimentation
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Filtration
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Disinfection and Fluoride
Injection Chlorine - Yellow pipeline Fluorid
e - Blue pipeline
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Wastewater Treatment Plant
Secondary Treatment
Raw wastewater
Trickling Filter
PrimarySedimentation
SecondarySedimentation
Screening
Aeration
Disinfection
AnaerobicDigestion
Treated effluent
Land DisposalIncinerationComposting
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Screens
Primary Sedimentation
Aeration
Anaerobic Digestion
Secondary Sedimentation
Post Aeration
Incineration
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Overview of Current Practice
RAPID MIX(disperse coagulant)
Alum or Ferric ChlorideAddition
FLOCCULATION(floc growth)
Q
TURBIDITYREMOVAL
NOMREMOVAL
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Impeller Types and Constants
www.cdak.co.kr/products
PitchedBlade
Rustonor vaned diskTurbine
Propeller
PitchedCurvedBlade
Helix
Anchor
Intermig
Table 13.4 Droste
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Flocculent Mixing

• Goal is to facilitate particle-particle
  collisions and form flocs

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Horizontal Flow Flocculator ence.umd.edu