Sketch a typical Streeter-Phelps oxygen-sag curve and state the limitations of the Streeter-Phelps equation shown below: D=: k,Lo 1+ Det k2 – k " (b) Wastewater discharges through an outfall into a slow moving river that has a mean velocity of 3 cm/s. After initial mixing, the dissolved oxygen concentration in the river is 9.5 mg/L, and the temperature is 20°c. The ultimate BOD of the mixed river water is 30 mg/L, the rate constant for BOD at 20°C is 0.48 d' and the re-aeration constant at the same temperature is 0.72 d. The saturation concentration of oxygen is 10.2 mg/L at 15°C. i. Estimate the critical time, to, and location, X, with reference to dissolved oxygen concentration. ii. Estimate the minimum dissolved oxygen at the critical location, and comment on the ecological implication of the same.

Sketch a typical Streeter-Phelps oxygen-sag curve and state the limitations of the Streeter-Phelps equation shown below: D=: k,Lo 1+ Det k2 – k " (b) Wastewater discharges through an outfall into a slow moving river that has a mean velocity of 3 cm/s. After initial mixing, the dissolved oxygen concentration in the river is 9.5 mg/L, and the temperature is 20°c. The ultimate BOD of the mixed river water is 30 mg/L, the rate constant for BOD at 20°C is 0.48 d' and the re-aeration constant at the same temperature is 0.72 d. The saturation concentration of oxygen is 10.2 mg/L at 15°C. i. Estimate the critical time, to, and location, X, with reference to dissolved oxygen concentration. ii. Estimate the minimum dissolved oxygen at the critical location, and comment on the ecological implication of the same.

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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Concept explainers

Collection Systems

The collection systems form a part of sanitary engineering, which is a sub-branch of civil engineering. It is also known as public health engineering and wastewater engineering. It is a methodology followed to remove and properly dispose of human waste, along with creating systems to provide safe and clean usable water. These measures ensure a hygienic and disease-free community. Sanitary engineering, apart from building sewer disposal units, is also involved in plumbing, fire protection, hydraulics, life safety, environmental protection, information technology, microbiology, pathology, and so on.

Question

Sketch a typical Streeter-Phelps oxygen-sag curve and state the limitations of the Streeter-Phelps
equation shown below:
k, Lo
-kt
D=
k2 – k
-e
(b) Wastewater discharges through an outfall into a slow moving river that has a mean velocity of 3
cm/s. After initial mixing, the dissolved oxygen concentration in the river is 9.5 mg/L, and the
temperature is 20°C. The ultimate BOD of the mixed river water is 30 mg/L, the rate constant for
BOD at 20°C is 0.48 di and the re-aeration constant at the same temperature is 0.72 d. The
saturation concentration of oxygen is 10.2 mg/L at 15°C.
i.
Estimate the critical time, to, and location, X., with reference to dissolved oxygen
concentration.
ii.
Estimate the minimum dissolved oxygen at the critical location, and comment on the
ecological implication of the same.

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