Civil Engineering MCQAE Level Civil Engineering
A high-rate trickling filter (HRTF) differs from a standard-rate filter in that HRTF has:
Environmental EngineeringTrickling Filter LoadingMEDIUM
Choose the correct answer
A
Lower hydraulic loading, finer media
B
Higher hydraulic loading (recirculation) and coarser media (40-100 mm), with recycle ratio 1-8
C
No recirculation
D
Lower BOD removal efficiency always
Correct Answer
B. Higher hydraulic loading (recirculation) and coarser media (40-100 mm), with recycle ratio 1-8
Why is this the answer?
High-rate TF: hydraulic loading = 10-40 m3/m2/day (with recirculation), media size 40-100 mm, recycle ratio 1-8. Standard TF: hydraulic loading 1-4 m3/m2/day, media 25-75 mm, no recirculation. HRTF gives >85% BOD removal in 2-pass systems.
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