The A tannery asked for assistance in prep for NPDES permits to discharge wastewater into X river.
Water quality criterion for X river is 5.00 mg/L of DO.
What is critical DO and where (at what distance) downstream does it occur?
Data is provided below. Flow data pertain to the 7-year, 10-day low flow at the tannery.
Please show calculations and steps in how to set up sag curve with given data.
|
Parameter
|
A wastewater
|
X River
|
|
Flow, m3/s
|
1.148
|
8.222
|
|
BOD5 at 20oC, mg/L
|
90.00
|
N/A
|
|
BODult at 20oC, mg/L
|
N/A
|
7.66
|
|
DO, mg/L
|
1.00
|
6.00
|
|
Temperature, oC
|
17.5
|
15.0
|
|
k at 20oC, d-1
|
0.3685
|
N/A
|
|
Speed, m/s
|
N/A
|
0.300
|
|
Depth, m
|
N/A
|
2.92
|
|
Bed-activity coefficient
|
N/A
|
0.100
|