Geoscience Reference
In-Depth Information
EXAMPLE 1.13
Convert pounds to flow in million gallons per day.
Quantity (lb/day)
Concentration(
Flow (MGD)
=
mg/L)
×
8.34 lb/mg/L/MG
Problem: 9640 pounds of solids must be removed from the activated biosolids process per day. The
waste activated biosolids concentration is 7699 mg/L. How many million gallons per day of waste
activated biosolids must be removed?
Solution:
9640 lb/day
7699 mg/L
Flow
=
= .15 MGD
0
×
8.34 lb/mg/L/MG
EXAMPLE 1.14
Convert million gallons per day (MGD) to gallons per minute (gpm).
Flow (MGD)
×
1,000,000 gal/MG
Flow (gpm)
=
1440
min/day
Problem: The current flow rate is 5.55 MGD. What is the flow rate in gallons per minute?
Solution:
5.55 MGD 1,000,000 gal/MG
1440 min/day
×
Flow
=
= 3854 gpm
EXAMPLE 1.15
Convert million gallons per day (MGD) to gallons per day (gpd).
Flow (gpd) = Flow (MGD) × 1,000,000 gal/MG
Problem: The influent meter reads 28.8 MGD. What is the current flow rate in gallons per day?
Solution:
Flow = 28.8 MGD × 1,000,000 gal/MG = 28,800,000 gpd
EXAMPLE 1.16
Convert million gallons per day (MGD) to cubic feet per second (cfs).
Flow (cfs) = Flow (MGD) × 1.55 cfs/MGD
Problem: The flow rate entering the grit channel is 2.89 MGD. What is the flow rate in cubic feet
per second?
Solution:
Flow = 2.89 MGD × 1.55 cfs/MGD = 4.48 cfs
 
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