A key component of water is the amount of dissolved oxygen that is available the water, (a) which plays an important role in everything from the quality of water to the livelihood of plants and animals. Dissolved oxygen refers to the total amount of oxygen currently present in the water. Bodies of water obtain oxygen from two separate sources, which include aquatic plants and the atmosphere. Aquatic plants create dissolved oxygen via the photosynthesis process. охудen (i) Discuss TW0 factors that could lead to the degradation or deterioration of oxygen level in water. (ii) With the help of a diagram, discuss the process and implication of oxygen sag curve.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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QUESTION 2
A key component of water is the amount of dissolved oxygen that is available the water,
(a)
which plays an important role in everything from the quality of water to the livelihood
of plants and animals. Dissolved oxygen refers to the total amount of oxygen currently
present in the water. Bodies of water obtain oxygen from two separate sources, which
include aquatic plants and the atmosphere. Aquatic plants create dissolved oxygen via
the photosynthesis process.
(i)
Discuss TW0 factors that could lead to the degradation or deterioration of
oxygen level in water.
(ii)
With the help of a diagram, discuss the process and implication of oxygen sag
curve.
The Batu Gajah City Council has identified a discharge of 28,540 m/d of treated
wastewater into Sungai Perak as illustrated in Figure Q2(b). The treated wastewater has
a BOD; of 23 mg/L and a k of 0.12 d at 25°C. Sungai Perak has a flow rate of 0.43 m/s
and an ultimate BOD of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the
wastewater is 1.5 mg/L. Compute the DO and initial ultimate BOD after mixing.
Calculate the initial deficit of the Sungai Perak after mixing with the wastewater.
Suggest TWO different methods to improve water quality especially on how to increase
the dissolved oxygen level in rivers and lakes.
(b)
Figure Q2(b)
Transcribed Image Text:QUESTION 2 A key component of water is the amount of dissolved oxygen that is available the water, (a) which plays an important role in everything from the quality of water to the livelihood of plants and animals. Dissolved oxygen refers to the total amount of oxygen currently present in the water. Bodies of water obtain oxygen from two separate sources, which include aquatic plants and the atmosphere. Aquatic plants create dissolved oxygen via the photosynthesis process. (i) Discuss TW0 factors that could lead to the degradation or deterioration of oxygen level in water. (ii) With the help of a diagram, discuss the process and implication of oxygen sag curve. The Batu Gajah City Council has identified a discharge of 28,540 m/d of treated wastewater into Sungai Perak as illustrated in Figure Q2(b). The treated wastewater has a BOD; of 23 mg/L and a k of 0.12 d at 25°C. Sungai Perak has a flow rate of 0.43 m/s and an ultimate BOD of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.5 mg/L. Compute the DO and initial ultimate BOD after mixing. Calculate the initial deficit of the Sungai Perak after mixing with the wastewater. Suggest TWO different methods to improve water quality especially on how to increase the dissolved oxygen level in rivers and lakes. (b) Figure Q2(b)
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