Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 15

■ Example 2.6
Convert cubic feet to gallons.

Gallons = Cubic feet (ft 3 ) × 7.48 ga l /f (ft3) 3

Problem: How many gallons of biosolids can be pumped to a digester that has
3600 ft 3 of volume available?

Solution:

Gallons = 3600 ft 3 × 7.48 gal l /f ft3 3 = 26,928 gal

■ Example 2.7
Convert gallons to cubic feet.

Gallons
7.48 gal/ft 3

Cubicfeet =

Problem: How many cubic feet of biosolids are removed when 18,200 gal are
withdrawn?

Solution:

Gallons
7.48 gal/ft

18,200 gal
7.48 gal/ft

= 2433 ft 3 =

3 3

■ Example 2.8
Convert gallons to pounds.

Pounds (lb) = Gallons × 8.34 lb/gal

Problem: If 1650 gal of solids are removed from the primary settling tank, how
many pounds of solids are removed?

Solution:

Pounds = 1650 gal × 8.34 lb/gal = 13,761 lb

■ Example 2.9
Convert pounds to gallons.

Pounds
8.34 lb/gal

Gallons =