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1.1 What would the 5-day BOD have been if the sample had been incubated at 25°C? 1.2 Would the 5-day BOD be higher at 15°C or at 25°C? Explain your answer without doing any calculations. 1.3 What is the BOD value after 12 days if the test is run at a temperature of 15°C? Use as 1.047.

1.1 What would the 5-day BOD have been if the sample had been incubated at 25°C? 1.2 Would the 5-day BOD be higher at 15°C or at 25°C? Explain your answer without doing any calculations. 1.3 What is the BOD value after 12 days if the test is run at a temperature of 15°C? Use as 1.047.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A test is run to determine the BOD value of a river at a point where wastewater is discharged into the river by a nearby village. The BOD, of the sample is determined to be 295mg/l at a temperature of 20°C. Since the water is known to be strong municipal wastewater, the k-value is known to be 0.40 per day (base e). Answer the following questions: 1.1 What would the 5-day BOD have been if the sample had been incubated at 25°C? 1.2 Would the 5-day BOD be higher at 15°C or at 25°C? Explain your answer without doing any calculations. 1.3 What is the BOD value after 12 days if the test is run at a temperature of 15°C? Use 0 as 1.047. 1.4 During the test at 20°C, 7.5ml of wastewater containing no dissolved oxygen is initially mixed with 275ml of diluted water containing 6.78mg/l of dissolved oxygen. After the 5-day incubation of the wastewater, the dissolved oxygen of the mixture is noted to be 4.19mg/l. Calculate the 5- day of the wastewater if standard 300ml BOD-bottle is used.
Transcribed Image Text:A test is run to determine the BOD value of a river at a point where wastewater is discharged into the river by a nearby village. The BOD, of the sample is determined to be 295mg/l at a temperature of 20°C. Since the water is known to be strong municipal wastewater, the k-value is known to be 0.40 per day (base e). Answer the following questions: 1.1 What would the 5-day BOD have been if the sample had been incubated at 25°C? 1.2 Would the 5-day BOD be higher at 15°C or at 25°C? Explain your answer without doing any calculations. 1.3 What is the BOD value after 12 days if the test is run at a temperature of 15°C? Use 0 as 1.047. 1.4 During the test at 20°C, 7.5ml of wastewater containing no dissolved oxygen is initially mixed with 275ml of diluted water containing 6.78mg/l of dissolved oxygen. After the 5-day incubation of the wastewater, the dissolved oxygen of the mixture is noted to be 4.19mg/l. Calculate the 5- day of the wastewater if standard 300ml BOD-bottle is used.
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