Lecture 6

Armenante njit nomenclature for flotation continued r

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Unformatted text preview: = wastewater volumetric flow rate (L/h) PIERO M. ARMENANTE NJIT Nomenclature for Flotation (continued) R = recycle ratio, defined as the ratio of recycle stream flow rate to the flow rate of the stream entering the system Sin = concentration of dissolved air in incoming wastewater (mg/L) Sout = concentration of dissolved air in outgoing wastewater (mg/L) X = concentration of solids in water (mg/L) PIERO M. ARMENANTE NJIT Calculation of Pressure to Produce a Desired A/S Ratio (No Recycle Case) Air Floatation Unit Q Wastewater Sin Sout The theoretical flow rate of air available for flotation (i.e., generated during depressurization) is: Fair = Q (Sin − Sout ) PIERO M. ARMENANTE NJIT Calculation of Pressure to Produce a Desired A/S Ratio (No Recycle Case) Since at equilibrium it is: Sin P = Sout Po then, the theoretical amount of air available for flotation (i.e., released in the flotation unit) is: P P − Po Fair = QSout − 1 = QSout Po Po PIERO M. ARMENANTE NJIT Calculation of Pressure to Produce a Desired A/S Ratio (No Recycle Case) In practice, the amount of air actually dissolved under pressure will onl...
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