Please could you help me solve this question and if it's possible to give me step by step solution.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

Detailed explanation:Thus rounding off the final values to match the options we get:1. A) 2500 ft22.…

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3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter6: Biological Processes

Section: Chapter Questions

Problem 6.1P

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Please could you help me solve this question and if it's possible to give me step by step solution.

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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