One of the paper mill factories is located near by the Sg Jerangau, Pahang, and the treated wastewater effluent from the factory is released to this river. However, there are Patin and Tilapia fishery industry located at the downstream of the river. Table 1 shows the characteristic of the wastewater effluent and river stream. Table 1: Characteristic of the water sample Wastewater 2000 Stream 25000 2 Parameter Flow(m/day) BODS(mg/L) DO 1400 10 50 10 Temperature(°C) kı at T=20°C k2 at T=20°C 0.35 0.55 a) Determine the characteristic of the mixture stream including BOD, Dissolve oxygen and temperature.
One of the paper mill factories is located near by the Sg Jerangau, Pahang, and the treated wastewater effluent from the factory is released to this river. However, there are Patin and Tilapia fishery industry located at the downstream of the river. Table 1 shows the characteristic of the wastewater effluent and river stream. Table 1: Characteristic of the water sample Wastewater 2000 Stream 25000 2 Parameter Flow(m/day) BODS(mg/L) DO 1400 10 50 10 Temperature(°C) kı at T=20°C k2 at T=20°C 0.35 0.55 a) Determine the characteristic of the mixture stream including BOD, Dissolve oxygen and temperature.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:One of the paper mill factories is located near by the Sg Jerangau, Pahang, and the treated
wastewater effluent from the factory is released to this river. However, there are Patin
and Tilapia fishery industry located at the downstream of the river. Table 1 shows the
characteristic of the wastewater effluent and river stream.
Table 1: Characteristic of the water sample
Stream
Wastewater
2000
Parameter
Flow(m/day)
BODS(mg/L)
DO
25000
2
1400
10
50
10
Temperature(°C)
kı at T=20°C
0.35
k2 at T=20°C
0.55
a)
Determine the characteristic of the mixture stream including BOD, Dissolve
oxygen and temperature.
b)
Determine the minimum dissolve oxygen concentration of the mixture.
Table C-3 Equilibrium concentrations (mg/L) of dis-
solved oxygen* as a function of temperature and
chloride
LIST OF FORMULA
Lt = Lo(1-e-kt)
kt = k200T-20
Chloride concentration, mg/L.
%3D
Temperature,
°C
5,000
10,000
15,000
20,000
0,31.047,0, =1.016
%3D
%3D
11.32
11.03
14.62
13.79
12.97
12.14
k2 - k,
- Do
k,Lo
-1)
De = Loe-kite
11.82
11.52
11.24
10.97
10.70
10.45
1.
14.23
13.41
13.05
12.72
12.41
12.09
11.79
1.
12.61
tc= m
In
k2-k,
13.84
13 48
13.13
12.28
11.98
11.69
11.39
%3D
10.76
10.50
10.25
10.01
4.
%3D
12.80
9.78
9.57
k2
6.
12.48
11.12
11.51 10.85
11.24 10.61
10.36
12.17
10.21
9.98
9.76
9.55
9.35
CQ, +C Q. QCm
9.36
9.17
8.
11.87
10.97
10.73
6.
11.59
8.98
8.80
10
11.33
10.13
9.92
9.72
%3D
11.08
10.49
9.17
8.98
12
10.83
10.28
8.62
9.52
9.32
13
10.60
10.05
8.46
8.30
8.80
8.63
14
10.37
9.85
15
10.15
9.65
9.14
8.14
16
9.95
9.46
8.96
8.47
7.99
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