Monday, 9 July 2018

Comparison Between Combined and Separate Sewer System

Difference Between Combined and Separate Sewer System:

Combined System =C
Separate System=S

1.
C  In this system only one set of sewer is laid and carries both sewage and storm water.
S  In this system two sets of sewers are laid for carrying sewage and storm water separately.

2.
C  The cleaning of sewers is easy as they are of large in size.
S   The cleaning of sewers is difficult as they are of small in size.

3.
C  The maintenance cost is less.
S  The maintenance cost is high.

4.
C  The load on treatment plant becomes high.
S  The load on treatment plant is less.

5.
C  The self cleaning velocity is easily achieved.
S  The self cleaning velocity is not easily achieved.

6.
C  Strength of sewage is less.
S  Strength of sewage is more.

7.
C  This system proves to be uneconomical when pumping is required for lifting of sewage.
This system proves to be economical when pumping is required for lifting of sewage.

8.
The storm water is unnecessarily polluted.
The storm water is not unnecessarily polluted.

9.
C  Initial cost is less.
S  Initial cost is more as compared to combined system.

10.
This system is suitable when the rainfall is small and evenly spread throughout the year.
S  This system is suitable when the rainfall is uneven or it is heavy for a short duration .

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