Summary:

The article presents results of research concerns amount and remove indices of nitrogen and phosphate in domestic sewage treatment plant. Analysis sewage treatment plants are objects working with method of active sludge. The first sewage treatment plant Turbojet EP-4 was installed in Pałecznica in province małopolska. The treatment plant works for Primary schools where about 100 children and theaters’ house inhabited 6 people. Second sewage treatment plant is called Biocompact BCT S-12 and was installed in Rajbrot village near Lipnica Murowana. It takes sewage from schools and a teachers’ house inhabited 12 people. Analysis of results of research concern four years 1999-2003, and in this time took sewers flow to and flow in to sewage treatment plants. The results of research of sewer analyzed statistical for characterize size concentration total nitrogen and phosphates in sewer. In analysis introduce frequency relativity of occurrence concentration indices of biogenic indices in clean sewer. Additionally characterize size of reduction indices in clean process. Composition in flow to sewer was type for living sewer. Mean reduction of biogenic indices was for nitrogen and phosphates for two treatment plant 63,6% and 51,4%. Mean values total nitrogen and phosphates in sewer flow to treatment plant Turbojet EP-4 took 85,12 mgN_og∙dm^-3 and 35,44 mgPO₄∙dm^-3. However in flow away took 25,35 mgN_og∙dm^-3 and 11,99 mgPO₄∙dm^-3. In treatment plant Biocompact BCT S-12 mean values nitrogen and phosphates in sewer flow to took 77,61 mgN_og∙dm^-3 and 34,12 mgPO₄∙dm^-3, however in sewer flow away mean values took 40,64 mgN_og∙dm^-3 for total nitrogen and 20,13 mgPO₄∙dm^-3 for phosphates.