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2 9 . 2 0 Consider the waste treatment operation proposed in the figure below. In this process, wastewater conraining a TCE concentration of 5
Consider the waste treatment operation proposed in the figure below. In this process, wastewater conraining a TCE concentration of gmo enters a clarifier, which is essentially a shallow, wellmixed tank with an exposed liquid surface. The overall diameter is and the maximum depth of the liquid in the tank is The clarifier is enclosed to contain the gases often quite odorous that are emitted from the wastewater. Fresh air is blown into this enclosure to sweep away the gases emitted from the clarifier and is then sent to an incinerator. The TCE content in the effluent gas is mol whereas the TCE content in the effluent liquid phase is mol TCE liquid. The clarifier operates at atm and a constant temperature of In independent pilot
plant studies for TCE, the liquid film masstransfer coefficient for the clarifier was, gmo whereas the gas film masstransfer coefficient for the clarifier was gmo s Equilibrium data for the airTCEwater system at are represented by Henry's law in the form with atm. The molar density of the effluent liquid is gmo
a What is the overall masstransfer coefficient based on the liquid phase,
b What is the flux of TCE from the clarifier liquid surface?
c What is the inlet volumetric flow rate of wastewater, in units of needed to ensure that the liquid effluent TCE concentration is gmolTC
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