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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.

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.

Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter4: Mechanical Processes
Section: Chapter Questions
Problem 4.2P
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**Wastewater Treatment Problem Set** The average wastewater flow from a community of 20,000 is 125 gallons per capita per day (gpcd). The 5-day, 20°C Biochemical Oxygen Demand (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 gallons per day per square foot (gpd/ft²). The trickling filters are to be 6 feet deep and operated at an organic loading of 55 pounds per 1000 cubic feet per day (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 This problem set explores critical aspects of designing and operating wastewater treatment systems, focusing on determining the necessary dimensions and efficiencies for practical application.
Transcribed Image Text:**Wastewater Treatment Problem Set** The average wastewater flow from a community of 20,000 is 125 gallons per capita per day (gpcd). The 5-day, 20°C Biochemical Oxygen Demand (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 gallons per day per square foot (gpd/ft²). The trickling filters are to be 6 feet deep and operated at an organic loading of 55 pounds per 1000 cubic feet per day (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 This problem set explores critical aspects of designing and operating wastewater treatment systems, focusing on determining the necessary dimensions and efficiencies for practical application.
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