I need to use a fed-batch reactor with continuous feeding for the treatment of wastewater (say 5g COD/L). A 1L reactor having 500 mL culture is being continuously fed with the carbon source, unlike batch reactor. So the COD inside the reactor would be very less at a point of time compared to COD of the effluent stream..
In this case, how can we take the initial and final substrate concentration to calculate a percent reduction value as the substrate is fed to reactors at a fixed flow rate.
For batch, this calculation would be simple (initial -final )/initial. But how can we find the percent reduction value for Fed-batch reactor.
The best would be to calculate reaction rate coefficients. In that way you can compare the two kinds of systems. When you have reaction rate coefficients, you can also subsequently calculate the percent removal this would correspond to under typical real conditions.
So as I understand it, part of the substrate is in the bioreactor, and part is added. To get the "initial" concentration, just sum the weights and relate to the final volume. Then measure the final substrate concentration and use the relationship given above.
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