[shyam_raman]

I have a simple problem. How do I design a reactor that treats wastewater that passes through a charcoal media of certain height embedded in the middle of reactor ?. Suppose we assume 0.1 m3 of wastewater is pumped in with a hydraulic retention time of 5 days.
How do we design the height of charcoal and the quantity of this charcoal needed to be filled within the reactor bed ?. Please reply.

[Gerard]

It is better you treat your fixed bed reactor under the assumption that it acts like a plug flow reactor and try to get the breakthrough curves by pilot plant runs, these curves are your plot of concentration vs.time and it will show the concentration profile within any given process time, then you can use the equation:

L=(tvc₀)/p(Wsat-W₀)
L=length of bulk bed
t=process time to reach a certain degree of reduction of c₀
c₀=initial concentration
p=density of bulk bed
Wsat=the concentration of solute on the packed bed at saturation
Wt=concentration of solute on packed bed at time, t