Wastewater New York State Practice Exam

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What is an effective velocity for a grit removal channel?

1.0 feet per second
0.8 feet per second
1.2 feet per second
1.5 feet per second

The correct answer is: 1.2 feet per second

An effective velocity for a grit removal channel is typically set to optimize the removal of sand and other inorganic materials while allowing organic materials to remain in suspension. A velocity of 1.2 feet per second has been established in many wastewater treatment practices as effective for this purpose. At this velocity, grit particles can settle out of the water stream, which helps in maintaining the efficiency of the treatment process and protecting downstream equipment from abrasion and clogging caused by abrasive materials. Even though other velocities listed might seem feasible, they may not provide the ideal balance for effective grit removal. If the velocity is too low, there is a risk that grit will not settle adequately, leading to accumulation in the system; if it is too high, organic material may also be swept away, defeating the purpose of grit removal. Thus, 1.2 feet per second aligns with established engineering practices for optimal grit removal efficiency in wastewater treatment processes.