The purpose of a Parshall flume is to:
a. Measure the rate of wastewater flow.
b. Ensure addition of chlorine at a constant rate.
c. Reduce the velocity of flow into the grit chamber.
d. Maintain a constant rate of flow into the primary settling tank(s).
Metering of wastewater flow is necessary to:
a. Prepare grab samples properly.
b. Prepare composite samples properly.
c. Add chlorine to the effluent at the proper level.
d. Determine the quantity of wastewater handled by the plant.
e. Know the velocity of the flow at all points in the plant at all times.
Most of the settling in primary settling tanks occurs during the first:
a. 30 minutes.
c. 2 hours.
d. 4 hours.
The normal detention time for average daily flow in primary settling tanks is
Sludge must be removed from plain sedimentatlon tanks frequently to prevent
the development of ________________________ conditions.