in both of the foregoing equations, the numerator represents the weight of air and the denominator the weight of the solids.
the factor 1.3 is the weight in milligrams of 1 mL of air and term (-1) within the brackets accounts for the face that the system is to be operated at atmospheric conditions.
the use of these equations is illustrated in Exp. 5-12.
additional information about the use of flotation for treating oily wastewater can be found in Eckenfelder (2000).