Environmental Engineering
In facultative stabilization pond, the sewage is treated by

Dual action of aerobic bacteria and anaerobic bacteria
Algae only
Sedimentation
Aerobic bacteria only

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Environmental Engineering
Scour valves are provided

At street corners to control the flow of water
At the foot of rising main along the slope to prevent back running of water
At every depression and dead ends to drain out the waste water that may collect there
At every summit of rising mains

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