Environmental Engineering Reference
In-Depth Information
Problem: The disinfection process uses 4800 lb/day of chlorine to disinfect a flow of
25 MGD. What is the concentration of chlorine applied to the effluent?
Solution :
4800 lb
Concentration
=
= 23 mg/L
25 MGD
×
8.34 lb/MG/mg/L
Example 2.120
Convert pounds to flow in million gallons per day.
Quantity (lb)
Concentration(mg/L
Flow (MGD)
=
)
×
8.34 lb/MG/mg/L
Problem: 9600 lb of solids must be removed from the activated biosolids process per
day. The waste activated biosolids concentration is 7690 mg/L. How many million
gallons per day of waste activated biosolids must be removed?
Solution:
9600 lb
Flow
=
=
0.15
MGD
7690 mg/L
×
8.34 lb/MG/mg/L
Example 2.121
Convert million gallons per day to gallons per minute.
Flow (MGD)
×
1,000,000 gal/MG
Flow (gpm)
=
1440
min/day
Problem: The current flow rate is 5.50 MGD. What is the flow rate in gallons per
m inute?
Solution :
5.50 MGD) 1,000,000 gal/MG
1440 min/day
×
Flow
=
= 3819.4 gpm
Example 2.122
Convert million gallons per day to gallons per day.
Flow (gpd) = Flow (MGD) × 1,000,000 gal/MG
Problem: The influent meter reads 28 MGD. What is the current flow rate in gallons
per day?
 
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