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Lecture 16 - PFRs Batch and CMFRs(comparisons Lecture#16...

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1 PFRs, Batch, and CMFRs (comparisons) Lecture#16 Comparison: PFR and Batch Comparison: PFR and CMFR: ICP #13 Review of mass flow balance equations for Batch, CMFR, and PFR Reading: V: Ch. 5 (pg. 106-109; 113; Table 5.2); PS#2 due; PS#3 out Reactor Types test tube, storage container, or world’s atmosphere lake, house, air over city pipe, river, channel, hallway, tunnel (L>> d or w) dm/dt = VdC/dt = m in - m out + m rxn PFR versus Batch Batch Reactor dC/dt = -kC n (decay) zero order (linear): C sys = C 0 kt first order (exponential): C sys = C 0 exp(-kt) PRF dC/dx = -kC n / ν (decay) zero order (linear): C out = C in kL/ ν first order (exponential): C out = C in exp(-kL/ ν ) C out = C in exp(-kV/Q) C out = C in exp(-k τ ) forms look identical with t = L/ ν CMFR versus PFR (steady-state) ICP# 13: In cases where low-level chlorine residual caused by chlorine disinfection may have a potential toxic effect on aquatic organisms, dechlorination of the chlorine treated effluent is practiced. In such circumstances, SO 2 (g) is commonly used and works according to the reaction: SO
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