Determine the dissolved oxygen content

Reference no: EM131566475

QUESTION 1.

Wastewater is to be discharged at a rate of 0.88m³/s into a river with K2-20 = 0.25day-1.

During the low water period the flow rate in the river is 10 m³/s at a temperature of 24°C and the dissolved oxygen is 8.5mg/l. Determine the maximum allowable 5-day BOD of the waste at 20°C if the dissolved oxygen content below the outfall is to be not less than 4mg/l.

Assume that the waste temperature is 24°C and that the river water above the outfall is saturated with oxygen of 8.1mg/l.

From the laboratory tests the value of K1 was found to be equal to 0.12 day-1 at 24°C.

Useful Equations

QUESTION 2. The 5-day BOD of a municipal wastewater is 280mg/l. If the ultimate BOD is reported to be 350mg/l, what is the value of the BOD reaction-rate constant?

(b) What percentage of the ultimate BOD of a wastewater has been satisfied after 3 days if the rate constant (base 10) is 0.10 day-1?

QUESTION 3.

If wastewater with dissolved oxygen content 0.8 mg/l is discharged at a rate of 0.22 m³/s into a stream saturated with oxygen (temperature 12.78°C, dissolved oxygen content of 10.6 mg/l) whose flow rate is 1.14 m³/s, determine the dissolved oxygen content of the resulting mixture.

If the stream flow had been only 0.28 m³/s with dissolved oxygen content of 8.1 mg/l and the stream temperature had been 26.67°C, what would be the dissolved oxygen content of the resulting mixture?

Reference no: EM131566475

Questions Cloud

The british airways swipe card debacle : With reference to John Kotter's eight-stage model of change, what mistakes did BA make in this instance

Explain why net operating working capital : Explain why net operating working capital is included in a capital budgeting analysis and how it is recovered at the end of a project’s life.

What amount of merchandise inventory should purchase : JT's cost of gods sold is 60% of sales dollars. What dollar amount of merchandise inventory should JT plan to purchase in August

Effective security program : What are the steps which an organization should take to ensure it has an effective security program?

Determine the dissolved oxygen content : Determine the dissolved oxygen content of the resulting mixture - what would be the dissolved oxygen content of the resulting mixture?

All-of-the-above energy strategy : Do you think that the United States should follow an all-of-the-above energy strategy? Why, or why not?

Are the us food resources threatened today : Are the U.S. food resources threatened today? Which food resources may be threatened by climate change?

Discuss type of health care organization : Compare this health care organization with one that is optimally ineffective in delivering health services and products as applicable.

Assume that the risk-free rate increases : Assume that the risk-free rate increases, but the market risk premium remains constant.

User Account

All Pages