Hi Ismael, the dissolved ...

Published March 9, 2018 12:08 by Philippe Drouet, Directeur Technique International chez SAUR

Hi Ismael, the dissolved iorganic (non-biodegradable) nitrogen stands for 1,5-3 mg/l for a typical domestic sewage water.

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Dear Phillipe, dissolved inorganic N (NH4, NO2, NO2) which has reliance to WWT processes; I have no idea about non-biodegradable inorganic N. The name of the game here is TKN; organic N. Microfiltration has limitations in removal of nitrogen fractions. We have difficulties in reaching a total N of 10 mgN/L in one of MBR facilities? What is the actual source of organic N is not easy? So, assuming of 2 mg N as TKN in the effluent (German DWA approach in ATV-A 131) is just to make the life of the process engineer easy in doing a N mass balance.

So, organic N can be non biodegradable if of biological origin as intermediate metabolites or of unknown industrial waste streams.

Published March 9, 2018 16:07 by Rashed Al-Sa`ed, Professor and IEWS Director

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