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Wastewater Collection System
Minhazul Islam
Program: BSCE
ID# 07206011
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Contents
Definition
Source
Types Design of a wastewater collection system
Design parameters
Construction procedures Conclusion
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Definition
Water comes from different sources such as
domestic sewage, industries, storm, sullage,
that may arise as hazardous for environment,
are considered as wastewater.
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Sources
Domestic flows
Industrial wastewater
Storm water Sullege, ie. liquid discharge from kitchen, wash
basin excluding water closets and urinals.
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Types of sewer
Building sewer
Branch sewer
Main sewer Trunk sewer
Intercepting sewer
Outflow sewer
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Types of collection systems
Separate sewerage system
Advantage:
1. Small size2. Less costly
Disadvantage:
Difficult to clean
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Types of collection systems
Separate sewerage system
Advantage:
1. Small size2. Less costly
Disadvantage:
Difficult to clean
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Types of collection systems
Separate sewerage system
Advantage:
1. Small size2. Less costly
Disadvantage:
Difficult to clean
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Types of collection systems
Separate sewerage system
Advantage:
1. Small size2. Less costly
Disadvantage:
Difficult to clean
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Types of collection systems(cont.)
Combined sewerage system
Advantage
1. More economical2. Easy to clean
Disadvantage
1. Increased load on treatment plant2. Storm water become
polluted
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Types of collection systems(cont.)
Partially combined or Partially separate
sewerage system
Advantage
1. Size is not very large
2. It contain both systems
Disdvantage1. Low velocity in dry season
2. Increased load in wet season
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Small bore sewerage systems
Septic tank
Small bore sewerage network
Treatment plant
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Design of a collection system
Design parameters:
Sewer alignment
Depth of sewer House connection
Peak wet weather flow capacity
Self cleaning flow velocity: .6m/sec Non scouring velocity
Pressure mains where necessary
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Non scouring velocity
2.5- 3.0 m/sec for concrete sewers
3.0- 3.5 m/sec for vitrified sewers
2.0- 2.5 m/sec for brick sewers
3.5- 4.0 m/sec for cast iron sewers
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Construction
Marking alignment
Setting benchmarks
Establishing grade lines Excavating the trench
Dewatering the trenches
Providing bedding Testing of sewers
Backfilling
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Construction of sewerage system
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Conclusion
Wastewater collection system is a national
activity of a country. Proper implementation
of this may increase advantage of the
inhabitants.
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Thank you
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Questions?
