Question $03(20$ pts$)$

Design the activated sludge component of the membrane bioreactor. Specifically,

determine the SRT$,$ volume, hydraulic residence time, and air flow requirements for the system.

Make sure that your design at a minimum meets the goals for your industrial need $($Given: $Q=$

$269\mathrm{.}33\frac{m^3}{d},$ BOD$5=169\mathrm{.}8\frac{g}{m^3}$ and TSS $=89\mathrm{.}9\frac{g}{m^3})$

Question $04(20$ pts$)$

Design the membrane portion of the membrane bioreactor based on problem $03.$ You

have chosen a Zenon ZW $500$ D system, with an operational flux of $15gfd$ determined through

comparative pilot testing between different available systems as your membrane system. The

operational strategy you want to use is $12$min operation followed by $2$ min relax. Also you want

a recirculation rate of $4$ times the permeate flow rate. Calculate the following:

$($i$)$ Calculate the actual design flux $($in gfd$)$ based on your operational strategy.

$($ii$)$ Calculate the membrane area $($ft$2).$ Calculate the number of modules needed.

How many would you actually use? Based on the above calculate the actual

operational flux $($in gfd$)$

$($iii$)$ Calculate the recirculation rate?

$($iv$)$ Contrary to the example discussed in class, larger submerged systems like

Zenon's system actually do not have a separate membrane tank, They are

actually immersed into and form a part of the bioreactor. Do you have enough

space in your bioreactor to fit all your modules? If not what would you do$?$Design the membrane portion of the membrane bioreactor based on problem $03($Design the activated sludge component of the membrane bioreactor. Specifically,

determine the SRT$,$ volume, hydraulic residence time, and air flow requirements for the system.

Make sure that your design at a minimum meets the goals for your industrial need $($Given: Q $=$

$269\mathrm{.}33$ m$3/$d$,$ BOD$5=169\mathrm{.}8$ g$/$m$3$ and TSS $=89\mathrm{.}9$ g$/$m$3)).$ You

have chosen a Zenon ZW $500$ D system, with an operational flux of $15$ gfd determined through

comparative pilot testing between different available systems as your membrane system. The

operational strategy you want to use is $12$ min operation followed by $2$ min relax. Also you want

a recirculation rate of $4$ times the permeate flow rate. Calculate the following:

$($i$)$ Calculate the actual design flux $($in gfd$)$ based on your operational strategy.

$($ii$)$ Calculate the membrane area $($ft$2).$ Calculate the number of modules needed.

How many would you actually use? Based on the above calculate the actual

operational flux $($in gfd$)$

$($iii$)$ Calculate the recirculation rate?

$($iv$)$ Contrary to the example discussed in class, larger submerged systems like

Zenon$$s system actually do not have a separate membrane tank, They are

actually immersed into and form a part of the bioreactor. Do you have enough

space in your bioreactor to fit all your modules? If not what would you do$?$