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Hi everyone, I have a question about the COD result value. The COD value of the influent concentration is divided according to different percentages (Inert and substrate COD dissolved, Inert, substrate and hetetrotroph particulated) according to the ASIM Manual provided. Which one of the provided results would be the final COD concentration at the end of the treatment line?
Mathematical modeling of biological wastewater treatment requires the overall COD to be subidvided into different fractions that are biodegradable/non-biodegradable and particulate or soluble. In addition to these substrates also the biomass is considered as separate COD fractions. After doing the simulation you can calculate the effluent COD from adding up all of these fractions. If you assume a perfect clarifier then you would have only soluble COD fractions in the effluent that would need to be added up. For further info you may also consider Rieger, L., Gillot, S., Langergraber, G., Ohtsuki, T., Shaw, A., Takacs, I. and Winkler, S. (2013) Guidelines for Using Activated Sludge Models, IWA Publishing. for guidance.