2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C BOD is 250 mg/L. The suspended solids content is 300 mg/L. A final plant effluent of 50 mg/L of BOD is to be achieved through the use of two sets of identical settling tanks and trickling filters operating in parallel. The settling tanks are to be designed to a standard of 1000 gpd/ft². The trickling filters are to be 6 ft deep and operated at an organic loading of 55 lbm/1000ft³.d. There is no recirculation.
2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C BOD is 250 mg/L. The suspended solids content is 300 mg/L. A final plant effluent of 50 mg/L of BOD is to be achieved through the use of two sets of identical settling tanks and trickling filters operating in parallel. The settling tanks are to be designed to a standard of 1000 gpd/ft². The trickling filters are to be 6 ft deep and operated at an organic loading of 55 lbm/1000ft³.d. There is no recirculation.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C
BOD is 250 mg/L. The suspended solids content is 300 mg/L. A final plant effluent of 50 mg/L of
BOD is to be achieved through the use of two sets of identical settling tanks and trickling filters
operating in parallel. The settling tanks are to be designed to a standard of 1000 gpd/ft2. The
trickling filters are to be 6 ft deep and operated at an organic loading of 55 lbm/1000ft³.d.
There is no recirculation.
(1) What settling tank surface area is required?
(A) 2500 ft²
(B) 3000 ft²
(C) 3500 ft²
(D) 4500 ft²
(2) What settling tank diameter is required?
(A) 40 ft
(B) 50 ft
(C) 65 ft
(D) 80 ft
(3) Estimate the BOD removal in the settling tanks?
(A) 15%
(B) 30%
(C) 45%
(D) 60%
(4) What is the trickling filter diameter?
(A) 65 ft
(B) 75 ft
(C) 85 ft
(D) 95 ft](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fda859fed-ae51-422c-9773-627805a70b82%2Fa28150ca-0f3d-4ea6-9dfd-06478130b967%2Fnkg7pod_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C
BOD is 250 mg/L. The suspended solids content is 300 mg/L. A final plant effluent of 50 mg/L of
BOD is to be achieved through the use of two sets of identical settling tanks and trickling filters
operating in parallel. The settling tanks are to be designed to a standard of 1000 gpd/ft2. The
trickling filters are to be 6 ft deep and operated at an organic loading of 55 lbm/1000ft³.d.
There is no recirculation.
(1) What settling tank surface area is required?
(A) 2500 ft²
(B) 3000 ft²
(C) 3500 ft²
(D) 4500 ft²
(2) What settling tank diameter is required?
(A) 40 ft
(B) 50 ft
(C) 65 ft
(D) 80 ft
(3) Estimate the BOD removal in the settling tanks?
(A) 15%
(B) 30%
(C) 45%
(D) 60%
(4) What is the trickling filter diameter?
(A) 65 ft
(B) 75 ft
(C) 85 ft
(D) 95 ft
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