Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

50 mg/l
100 mg/l
250 mg/l
150 mg/l

ANSWER DOWNLOAD EXAMIANS APP

Waste Water Engineering
Traps

Dissolve the foul gases
Are used to trap the rats entering sewers
Create symphonic action to increase the quick disposal of sewerage
Are water seals which prevent the entry of foul gases

ANSWER DOWNLOAD EXAMIANS APP

Waste Water Engineering
The clarigesters are

Rectangular septic tanks
Circular septic tanks
Circular Imhoff double storey tanks without bottom hoppers
Circular Imhoff double tanks with bottom hoppers

ANSWER DOWNLOAD EXAMIANS APP