To calculate the COD removed,
We have the following equoition according to K. N. Nwaigwe and C. Enweremadu
% COD = (COD (O) -COD (t)) / COD (0). (1)
Where COD (0) is the initial COD or the COD at t = 0, its numerical value; While COD (t) = the COD at any time t.
During anaerobic digestion there is an increase the dissolved COD. In this case how to calculated the removed COD?
According to this equation at some time the removed COD will be negative.
Also at the end of anaerobic digestion there is not a large difference between the initial and final COD.
And the great COD values generally recorded in the hydrolysis and acidogenesis phase.
Thank you dear colleague for your collaboration
Dear Mohammed,
If you digest solid waste such as manure or food waste or OFMSW, it might be better to check TS (total solid) and VS (volatile solid) removal. Or total COD can be determined instead of soluble one.
Thank you Dear Dr. Alper Bayrakdar
I have already followed VS removal
I will try with total COD
regards
Dear Mr. Mohammed,
I will go in the same line as Mr. Allen. It is better to measure total COD (soluble and particulate COD). This will ensure that you don't end up with a negative value. If you measure dissolved COD (also known as soluble COD or SCOD), then you will definitely end up with a negative value at some point due to hydrolysis which breaks down and solubilises organic matter.
If your anaerobic digestion process is working effectively, you should be getting a reduction in COD values (make sure you measure total COD for both initial and final). Besides, it may be that COD of inoculum is interfering with your COD values. You may measure the initial COD as that of the mix of substrates and inoculum and the final COD as that of the whole digestate (both solid and liquid part).
Thank you Dear Dr. Zumar Muhammad Ali Bundhoo
I will try with total COD
regards
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