The barrier role of sewage treatment plants in relation to sanitary-indicative and pathogenic bacteria, parasitic agents on the example of the southern zone of Russia

Introduction. From the sanitary and epidemiologic point of view the economic and household sewage making more than 80% of the volume of all water disposal is of the greatest practical interest. The infectious agents getting to the sewerage do not perish independently. The problem of treatment facilities of the sewerage consists of prevention of possible distribution through water of intestinal and parasitic infections. Aim of the study. To investigate the overall efficiency of sewage treatment facilities in relation to pathogenic and sanitary indicator bacteria and pathogens of parasitic diseases. Materials and methods. The object of the study was microbial and parasitic communities of household waste water from sewage treatment plants in a number of cities in the Rostov region. In work standard microbiological methods of research according to MU 2.1.5.800-99 and the methods of sanitary and parasitological researches of sewage stated in MUK 4.2.2661-10 and also author’s techniques (No. FTs/4022 MR) are used Results. The sewage of the studied cities arriving on sewage treatment plants has high degree of contamination on all bacteriological and parasitological indicators. At the same time intensity of pollution of sewage on these indicators for city drains was in the limits provided by MU 2.1.5.800-99. Dynamics of decontamination process at stages of sewage treatment facilities is shown. During normal operation of treatment systems, waste water is completely freed from salmonella. The species composition of parasitosis pathogens in wastewater that underwent the treatment stages, as well as those arriving, was almost identical in all territories. Conclusion. Researches have shown that at respect for technology of water processing of treatment facilities of the sewerage waste water practically corresponds to normative documents on bacteriological indicators. At the same time, the low performance concerning disinvasion and deworming is shown.