Modeling Tools for Environmental Engineers and Scientists

If the WWTP used air instead of pure oxygen, do you think the chemicalplant would be able to discharge at a higher rate than the one calculatedabove? Explain without any calculations.5.4. Refer to Equation (5.35) where the overall mass transfer coefficient withreference to the liquid-side film, K L , is dimensioned as (ML –2 T –1 ),while in Equation (4.28), it is defined and dimensioned as (LT –1 ).Reconcile these two forms of K L .5.5. Sparged tanks have been proposed for the removal of synthetic organicchemicals (SOCs) from water. Here, SOCs can be removed by twomechanisms—volatilization and oxidation. The oxidation process canbe approximated by a first-order process of rate constant k O3 . Followingthe approach and the notation used in developing Equation (5.49), andassuming the liquid phase to be completely mixed, develop a model todescribe the effluent concentration of the SOC from the tank. The modelshould be in terms of the parameters Q, G, V, K a–w , and K G a defined inEquation (5.49); and τ, the hydraulic detention time; and C O3 , the dissolvedconcentration of ozone in the reactor.5.6. Continuing the above problem 5.4, construct MB equations for ozone inthe gas and liquid phases. The rate of loss of ozone in the gas phaseshould equal the rate of consumption by the reaction in the liquid phaseplus the rate of outflow in the effluent. Hence, derive an expression forC O3 that can be used in the result derived in the above problem 5.4.© 2002 by CRC Press LLC