Question 9001 of 234 · California Wastewater Operator Exam
A plant receives 2.5 MGD with an influent BOD of 220 mg/L. How many pounds of BOD enter the plant per day?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 9001
- A: 4,587 lbs/day
Explanation
Pounds per day = 8.34 x flow (MGD) x concentration (mg/L) = 8.34 x 2.5 x 220 = 4,587 lbs/day. Using 7.48 (gallons per cubic foot) or leaving out a factor are common mistakes.
More questions: Process Math and Unit Conversions
- 9002A plant treats 1.8 MGD. Influent TSS is 250 mg/L and effluent TSS is 20 mg/L. How many pounds of TSS are removed per day?
- 9003Influent BOD is 210 mg/L and effluent BOD is 18 mg/L. What is the percent removal?
- 9004A rectangular tank is 60 ft long, 20 ft wide, and 10 ft deep. Flow is 1.5 MGD. What is the detention time in hours?
- 9005A circular clarifier has a diameter of 50 ft and receives 1.2 MGD. What is the surface overflow rate?
- 9006A circular clarifier, 60 ft in diameter, has a weir around its circumference. Flow is 1.5 MGD. What is the weir overflow rate?
- 9007The chlorine dose is 8 mg/L and the flow is 3 MGD. How many pounds of chlorine are needed per day?