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Waste Water Engineering

Waste Water Engineering
Sewer pipes need be checked for

Minimum flow
None of these
Both A and B
Maximum flow

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Waste Water Engineering
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

Is doubled
Is not enough
Is trebled
Is only provided

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Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.011
0.013
0.01
0.012

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Waste Water Engineering
In detritus tanks,

All listed here
Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated
Flow velocity is kept 0.09 m/sec

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Waste Water Engineering
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

Sewer outfall
Branch sewer
House sewer
Lateral sewer

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Waste Water Engineering
No treatment of the sewage is given if dilution factor is

Less than 150
Between 150 to 200
More than 500
Between 200 to 300

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