Which of the following is a typical location for in-plant flow meters?

• A. WAS
• B. Sidestream flows
• C. Sludge withdrawal volumes from storage tanks
• D. RAS

Answer: (C)

In-plant flow meters are placed where a process stream moves inside the plant so you can directly monitor how much liquid is being produced, transferred, or removed, which is essential for balancing processes and controlling operations.

Sludge withdrawal volumes from storage tanks are a typical location because this line represents the actual rate at which processed sludge is leaving a storage area to go to digestion, dewatering, or further handling. Measuring flow here gives a clear, controllable metric of sludge production and load, which is crucial for maintaining proper sludge age, mass balance, and overall plant operation.

Sidestream flows, WAS, or RAS are important process streams, but the common, practical spot for an in-plant flow meter to quantify sludge handling activity is on the sludge withdrawal from storage tanks.