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What do know About Sewage treatment and Sewage Reactions ?

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... Cont d Saudi Aramco Biggest sewage treatment plant operated by the company Treat 10 ... Sewage Treatment Processes Cont d Secondary Treatment ... – PowerPoint PPT presentation

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Title: What do know About Sewage treatment and Sewage Reactions ?


1
An Overview of Sewage Treatment and Sewage
Reactions
By ABDULRAHMAN AL-BETAR
ECU 2001
2
Outline
  • Introduction
  • Dhahran S.T.P in Saudi Aramco
  • Sewage Treatment Processes
  • Preliminary
  • Primary
  • Secondary
  • Tertiary

3
Introduction
  • Definitions
  • Sewage
  • The content of sewer or drains
  • Sewage Treatment
  • Removing of impurities so that the remaining
    waste water can be safely returned to the river
    or sea and become part of the natural water cycle
    again.

4
Introduction Contd
  • Compositions
  • Human waste
  • paper
  • Food
  • Grease
  • Mineral matter
  • and almost any things that can be carried by
    water

5
Saudi Aramco
Dhahran S.T.P
  • Biggest sewage treatment plant operated by the
    company
  • Treat 10 million gallons per day of raw sewage
  • Sodium Hypo-chlorite is used in secondary and
    tertiary treatments for disinfections
  • Treated water is used for the irrigation purposes

6
Sewage Treatment Processes
  • Preliminary
  • Primary
  • Secondary
  • Tertiary

7
Sewage Treatment Processes Contd
Preliminary Treatment
  • Solids like wood paper, rags and plastic are
    removed by screens

8
Sewage Treatment Processes Contd
Primary Treatment
  • The remaining solids that passed from the
    preliminary treatment are removed
  • About 70 of solids settle out at this stage

9
Sewage Treatment Processes Contd
Secondary Treatment
  • Biological treatment to reduce organic matter in
    the waste stream
  • Aerobic bacteria is the main cause for this
    reduction
  • The chemical reaction
  • Organic matter CO2 H2O

Bacteria
O2
10
Sewage Treatment Processes Contd
Secondary Treatment
  • This process can be speeded up by blowing air
    into tanks of sewage
  • These treatment units are called Aeration
    Tanks.

11
Sewage Treatment Processes Contd
Aeration Tank
12
Bacteria Found in the Sewage
Sewage Treatment Processes Contd
Secondary Treatment
  • Aerobic
  • Require dissolved oxygen for their existence
  • Ex Earobacter

Facultative Can grow with or without oxygen Ex
Salmonella
Anaerobic Exist in the absence of dissolved
oxygen Ex Sulfate Reducer
13
Sewage Treatment Processes Contd
Tertiary Treatment
  • Several forms of tertiary treatment are available
    for example
  • Passing the effluent over grass plots
  • Retaining the effluent in lagoons
  • Filtering through sand beds

14
Summary of Sewage Treatment Processes
15
END OF SEWAGE TREATMENT
Thank You
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