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Environmental Engineering

Environmental Engineering
The design discharge for the separate sewer system shall be taken as

Equal to dry weather flow (DWF)
6 × DWF
3 × DWF
2 × DWF

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

1.0 to 5.0 ppm
0.05 to 0.5 ppm
0.01 to 0.05 ppm
0.5 to 1.0 ppm

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Environmental Engineering
The ratio of 5 day BOD to ultimate BOD is about

43864
43894
1
43833

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Intercepting sewer
House sewer
Sub-main sewer
Lateral sewer

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Environmental Engineering
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

10 ppm
4 ppm
1 ppm
40 ppm

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Environmental Engineering
In water treatment, rapid gravity filters are adopted to remove

Dissolved solids and dissolved gases
Floating solids and dissolved inorganic solids
Bacteria and colloidal solids
Dissolved organic substances

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