In a typical municipal wastewater treatment plant, at which point in the treatment process is the influent flow meter located?
Explanation
Answer: C - In a typical municipal wastewater treatment plant, the influent flow meter is located between the grit removal and the lift pumps. The flow meter then protected from the large debris removed by the screens (roots, rags, grease, and plastics) and the inorganic solids (sand, gravel, and eggshells) that settle out during the grit removal process. Flow meters placed on gravity lines are generally less expensive and easier to service than those placed on pressure lines. Therefore, the influent flow monitor is located before the pumps that lift the influent wastewater high enough to permit gravity flow through the primary and secondary treatment units.
