Quality of sewage water purification as composition function of input stream
The article considers the actual problem of the quality of sewage water purification. Due to the fact that the contamination of an input stream of sewage water flow is influenced by external factors (usage of detergents containing phosphates, and illegal discharges), and these external factors are given insufficient attention, the goal of the research is the study of stability of indicators of an input flow of sewage water, and its impact on the quality of the purification of sewers. As a result of research in utility enterprise «Chernihivvodokanal» within 18 months, it was revealed that the frequency histogram of occurrence of the indicator BOC5 (biochemical oxygen consumption for 5 days) in selected ranges indicates considerable instability of content of sewage water over time that stipulates the complexity of quality and process stability assurance. We have obtained data that specify the relationship between the BOC at the input and output, as well as between BOC5 and BOCfull that has practical value for the improvement of the efficiency of control over the process of sewage water purification.