Register
A city has a population of 50,000 people, an average household generated wastewater flow of 430 L/day-person, and the average BOD5 of the untreated wastewater in population equivalents is 0.1 kg BOD5/day-person.
164k views
2 votes
A city has a population of 50,000 people, an average household generated wastewater flow of 430 L/day-person, and the average BOD5 of the untreated wastewater in population equivalents is 0.1 kg BOD5/day-person. If the BOD reaction rate constant for the waste stream is 0.4/day. Determine the ultimate BOD of the wastewater.

User Moby Disk
by
5.3k points

1 Answer

3 votes

Answer:

The ultimate BOD of waste water is 265 milligram per Liter.

Step-by-step explanation:

To start with and properly determine the ultimate BOD of the waste water, we need to determine the volume of water used by the population in the city within five days.

Therefore, 50000 people × 430 Liters ÷ day-person × 5 days

1.08 × 10∧8 Liters

The mass BOD5 by the city population in 5 days is therefore,

0.1 kilogram × BOD5 ÷ day-person × 50000 people × 5 days

2.5 × 10 ∧ 4 BOD5

The 5 days BOD of waste water is therefore,

5d = 2.5 × 10 ∧ 4 / 1.08 × 10 ∧ 8 Liters × 1000grams ÷ 1 kilogram × 1000mg ÷ 1gram

233 milligram / liter

The ultimate BOD, is therefore,

ULo = 5d ÷ (1 - e ∧ -k5)

Solving this further, we derive

265 milligram per Liter.

User Riajur Rahman
by
5.8k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

5.7m questions

7.4m answers

Other Questions

A piston-cylinder device fitted with stops in the cylinder walls contains 2.1 kg of water initially at 150 kPa and 30 °C. Heat is transferred to the system until the final temperature reaches 250 °C. The
4. Which of the following is the first thing you should do when attempting to park? A. Securing the parking spot by standing in it B. Turning on your hazard lights C. Confirming the space can fit your
A water towers lowest point is 405 ft and the main line is 6 feet below the ground. The ground elevation is at 276 ft. The main line travels 2.9 miles. The pipe will travel through the following flanged
An activated sludge plant is being designed to handle a feed rate of 0.438 m3 /sec. The influent BOD concentration is 150 mg/L and the cell concentration (MLVSS) is 2,200 mg/L. If you wish to operate the
A car has an initial speed of 10 m/s. It then undergoes a constant acceleration of 0.05 m/s^2 over a distance of 5 km. Determine: a) The car final speed. b) The time needed to travel the 5 km.
Link Copied!