when calculate COD in fed-batch MECs, it is very useful that duration the period of time between one feed and the next, the reactor can be considered a closed system (batch- mode). So COD equal to.......

refer to blow paper:

I don't realy understand your question but: you should measure the COD during time and so yo can calculate the cinetic of consumption.

Dear Abudukeremu,

I may not have fully understood your question, but let me share our recently published article on 'Microbial electrolysis cells for hydrogen production and urban wastewater treatment: A case study of Saudi Arabia' in Applied Energy Journal with you.

We have calculated the total amount of energy that can be produced from domestic and industrial wastewaters in Saudi Arabia through MEC system, based on standard energy generation potential of 7.6 and 16.8 kJ/L for domestic and industrial wastewater respectively.

Here is the link to the paper

http://www.sciencedirect.com/science/article/pii/S0306261916315902

All the best

Rehan