NITRIFIKATION OCH NITRIFIKATIONSHÄMNING I SAMBAND MED BOD-ANALYS, Nitrification and Inhibition of Nitrification in the BOD Test
The nitrification in the BOD-test at different contents of nitrification inhibiting agents has been investigated through analyzing the contents of ammonia-nitrogen, Kjeldahl-nitrogen, nitrite+nitrate-nitrogen and alkalinity before and after incubation. The tests have been made on treated sewage from Henriksdal sewage treatment plant, a plant with partial nitrification in the activated sludge process. BOD-tests have been made both without nitrification inhibition and with inhibition by adding 0.5, 2 and 20 mg/1 allylthio-urea (ATU) and 10 mg/l 2-chloro-6(trichloro methyl)pyridine (TCMP). The investigations show nitrification both in the BOD-tests without inhibition and in those with inhibition through addition of 0.5 mg/1 ATU and 10 mg/1 TCMP. The average nitrification in these tests corresponds to an oxygen demand of 42.0, 7.3, 23.7 mg/1 respectively in undiluted treated sewage. “Complete abstract not presented.”