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Research aims The aim of the conducted research was to assess efficiency of sewage treatment in rural areas in a sewage treatment plant with a sequencing batch reactor (SBR). Materials and methods Assessment of effectiveness of wastewater disposal in a treatment plant was carried out using elements of reliability theory. Research covered a period from March 2014 to December 2015. The content of pollution indicators in treated wastewater was compared with limit values included in the Regulation of the Minister of the Environment of November 18, 2014. Reliability analysis was performed for the following pollution indicators: BOD5, CODCr and total suspended solids. Reliability coefficient RF was assumed as a basis for reliability calculations. Next, technological treatment efficiency index (P-so) was calculated. Results and conclusions An analysis of treated wastewater in relation to three tested parameters proved that the treatment plant works properly. Limit values of examined indicators - included in the Regulation (Dz. U. 2014 poz. 1800) - have not been exceeded. Also, all the analysed parameters have shown high percentage of pollutant reduction, ranging between 96% for CODCr and 99% for BOD5. Obtained values of reliability indicators for the analysed treatment plant confirm its good condition.

ASSESSMENT OF EFFICIENCY OF RURAL SEWAGE TREATMENT PLANT WITH BIOREACTOR