REFRESHER COURSE ON SEWAGE TREATMENT PLANT DESIGN - PowerPoint PPT Presentation

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REFRESHER COURSE ON SEWAGE TREATMENT PLANT DESIGN

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Module 2 Wastewater Treatment Technologies Indian Standards for Drinking Water Quality Unit Operations and Processes Screening Aeration Sedimentation Coagulation ... – PowerPoint PPT presentation

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Title: REFRESHER COURSE ON SEWAGE TREATMENT PLANT DESIGN


1
Module 2
  • Wastewater Treatment Technologies

2
I Flow Sheets of Water Treatment
3
Sample 1 - Sample 7
4
Indian Standards for Drinking Water Quality
5
  • Unit Operations and Processes
  • Screening
  • Aeration
  • Sedimentation
  • Coagulation
  • Flocculation
  • Filtration (Rapid sand/ Slow sand)
  • Water softening
  • Disinfection

6
  • Unit Operations and Processes
  • Equalisation
  • Neutralisation
  • Grit removal
  • Flotation
  • Chemical ppn
  • Ion exchange
  • Adsorption
  • Biological processes (aerobic / anaerobic)
  • Chemical/ advanced oxidation processes
  • Wet air oxidation
  • Filtration processes (RO/UF/NF)

7
  • Factors considered for evaluating selecting
    Unit Operations Processes
  • Process applicability
  • Applicable flow range
  • Applicable flow variation
  • Influent ww characteristics
  • Inhibiting constituents
  • Climatic constraints
  • Process sizing based on reaction kinetics
  • Process sizing based on mass transfer rates

8
  • Factors considered for evaluating selecting
    Unit Operations Processes
  • 9 performance
  • treatment residuals
  • Sludge processing
  • Envi constraints
  • Chemical requirements
  • Energy requirements
  • Other resource requirements
  • Personnel requirements
  • OM requirements
  • Ancillary processes
  • Reliability
  • Complexity
  • Compatibility
  • Adaptability
  • Economic life cycle analysis
  • Land availability

9
(a) Surface Water
Chlorination
Storage
Turbidity lt10 NTU No odour, No colour
10
(b) Ground Water
Chlorination
Turbidity lt10 NTU No odour, No colour
11
(c) Surface Water
Plain Sedimentation
Slow sand filtration
Chlorination
Turbidity gt50 NTU Sufficient area available
12
(d) Surface Water
Highly polluted water with algae and
microorganisms)
Chlorination (pre)
sedimentation
Aeration
Coagulation
Flocculation
Chlorination (Post)
Rapid sand Filtration
13
(e) Water with excessive hardness
Softening
Rapid Sand Filtration
Chlorination (Post)
Excessive Hardness
14
II Flow Sheets of Wastewater Treatment
15
Effluent Disposal and utilisation
  • Water body, land ( disposal )
  • Reclamation ( industrial reuse )
  • Reuse in agriculture, horticulture
  • GW recharge

16
SOLIDS( Raw
sewage99.9 water0.1 solids)
  • Solids 50 suspended 50 dissolved
  • Solids 70 organic 30 inorganic

17
Sewage characteristics (Major
Pollutants)
  • Suspended solids
  • Biodegradable organics
  • Pathogens
  • Nutrients
  • Dissolved inorganic solids
  • Waste Oxygen Oxidised
    waste
  • New bacterias

bacteria
18
Typical composition of domestic waste water
19
Indian Standards Related to Disposal of Treated
Effluents
20
Basic design considerations
  • 1.Degree of treatment (Water Act1974)
  • 2.Design period (30 years)
  • 3.Population (future population)
  • 4.Sewage Flows (Peak, Average, Min)
  • 5.Sewage characteristics

21
Basic design considerations (cont.)
  • 6.Effect of industrial wastes
  • 7.Effluent disposal and utilization
  • 8.Unit operations processes for treatment
  • 9.Design of process flow sheets for treatment
  • 10. Choice of processes

22
  • Design of process flow sheets for treatment

23
  • Unit Operations and Processes
  • Physical (screening, grit removal
    sedimentation)
  • Chemical (Coagulation, flocculation)
  • Biological suspended / attached growth, aerobic
    / anaerobic

24
Typical wastewater treatment process
Pre-treatment Eg physical/chemical treatment,
solids separation
Treatment Biological treatment Eg aerobic/
anaerobic suspended/attached batch/continuous
Post-treatment Egfiltration, adsorption
Discharge of clean effluent
BIOREACTOR
25
Aerobic Biological Treatment Processes
  • Suspended Growth
  • Activated sludge
  • Oxidation ditches/ponds
  • Aerated lagoons, stabilization ponds
  • Attached Growth
  • Trickling filters
  • Rotating Biological Contactors (RBCs)

26
CHOICE OF PROCESSES
27
Activated Sludge
  • Process in which a mixture of wastewater
    microorganisms is agitated aerated
  • Leads to oxidation of dissolved organics
  • After oxidation, sludge is separated from
    wastewater
  • DT approximately 6 - 8 hr

28
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29
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30
Trickling Filters
  • Rotating distribution arm sprays primary effluent
    over circular bed of rock or other coarse media.
  • Air circulates in pores between rocks.
  • Biofilm develops on rocks and micro-organisms
    degrade wastes as they flow past

31
Trickling Filters
Filter Material
32
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33
SLUDGE DRYING
34
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35
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36
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