Fig. 2.8. Diagrammatic representations of chemostats with feedback (Pirt, 1975).

(a) Internal feedback.

f — flow rate of incoming medium (dm3 h~J) c = fraction of the outflow which is not filtered x = biomass concentration in the vessel and in theunfiltered stream hx = biomass concentration in the filtered stream

(b) External feedback.

F- flow rate from the medium reservoir (dm3 h"1) fs = flow rate of the effluent upstream of the separator * = biomass concentration in the vessel and upstream of the separator hx = biomass concentration in the dilute stream from the separator g= factor by which the separator concentrates the biomass a = proportion of the flow which is fed back to the fermenter s = substrate concentration in the vessel and effluent lines sr = substrate concentration in the medium reservoir filtered stream is (1 - c)F. The concentration of the biomass in the fermenter and in the unfiltered stream is x and the concentration of biomass in the filtered stream is hx. The biomass balance of the system is:

Change in biomass = Growth - Output in unfiltered stream - Output in filtered stream, which may be expressed as:

Ax/At = nx - D{c{ 1 - h) + h}x. At steady state Ax/At = 0, thus:

fix = D{c( 1 - h) + h}x and fi = £>{c(l - h) + h].

If the term 'c(l - h) + h' is represented by 'A', then-

Vinegar For Your Health

Vinegar For Your Health

A resource for the many ways you can use Vinegar to improve your health! In today's society of miracle medicine, we often overlook things that have been around hundreds of years! Things like Vinegar!

Get My Free Ebook

Post a comment