The following data summarize the concentration changes of various dissolved nitrogen species in a biological wastewater treatment process. The species listed as "organic matter" has an average composition of C30H33O18N. Determine the change in total dissolved nitrogen (TDN) concentration in the process. Species Influent conc’n (mg/L) Effluent conc’n (mg/L) ITT NH4+ 28 4.5 NH3 1.8 0.4 NO3- 0.2 95 NO2- 0.1 0.0 Organic N 265 21

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