Engineering Board Exam Reviewer · Environmental Engineering · hard

A circular primary clarifier must treat 10,000 m3/day at an overflow rate of 40 m3/m2· day. What diameter is required?

1. 8.92 m
2. 79.58 m
3. 17.84 m
4. 15.81 m

Answer

C. 17.84 m

Solution

A = Q/OFR = 10,000/40 = 250 m2. D = sqrt(4A/π ) = 17.84 m.

More Environmental Engineering questions

1. A city's population grew from 40,000 in 2010 to 52,000 in 2020. What is the average annual geometric growth rate?
2. A river has L0 = 20 mg/L, D0 = 1.0 mg/L, k1 = 0.23/ day and k2 = 0.50/ day. What is the critical (maximum) DO deficit?
3. Downstream of an outfall, a river has an initial ultimate BOD of 20 mg/L and an initial DO deficit of 1.0 mg/L. With k1 = 0.23/ day and k2…
4. UV disinfection inactivates microorganisms by:
5. Ozone used as a disinfectant in water treatment has the disadvantage that it:
6. Grit chambers in wastewater treatment are used to remove:
7. The primary purpose of a sanitary landfill's daily soil cover is to:
8. Bioremediation is the use of:
9. Groundwater overextraction in coastal areas can lead to:
10. In the Philippines, the El Niño phenomenon is typically associated with:

All Environmental Engineering Reviewer questions