Conceptual Questions A Based on reactor mass balance princip

Conceptual Questions:

A) Based on reactor mass balance principles, explain why plug flow is preferred over a completely mixed reactor for disinfection. B) A new employee has proposed using a vertical serpentine flow chlorine disinfection chamber rather than a longitudinal-flow serpentine chlorine chamber in order to save space. Do you agree with this proposal? Explain your reasoning.

Solution

(A)Answer:-The ideal reactor for disinfectant chlorine, combined chlorine is ideal plug flow. Longitudinal dispersion is not present in plug flow reactor so that the contact time is equal to hydraulic residence time. Completely mixed reactor is not more useful in disinfection. We prefer plug flow reactor.

(B) Answer:- Vertical serpentine chamber is more preferable than longitudinal serpentine basin . Because longitudinal serpentine basin is generally the most cost effective means of providing a contact chamber approaching ideal plug flow. Because the serpentine flow results in flow separation and dead spots as a result of 180 degree flow reversal. Longitudinal serpentine chamber is not useful in save space.