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The main factor of effective biological waste water treatment and pollutants biotransformation is correlation between different nitrogen forms in the media. The waste water specimens were obtained from the pulp and paper mill of the Russian North involving BAS-technology. Concentration of ammonium ions in wastewater was carried out on a spectrophotometer by Sedji-Solorzano method using phenol-hypochlorite reaction. Nitrite ions were determined colorimetrically by diazotization with sulfanilamide and subsequent cou...