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UDC 628.1.033:543.9
Tymchuk S. N., Larin V. E., Sokolov D. M.
Most significant sanitary microbiological parameters of drinking water quality assessment
Summary
Sanitary control of water is a complex and multilevel process. It is associated with every stage of water use, starting from the water supply source selection, monitoring, and water treatment to disinfection and wastewater disposal to collection facilities. Sanitary and microbiological water assessment implies determining sanitary profile, i. e. criteria that reflect compliance or noncompliance of the object under investigation with the regulatory documents requirements. The determined parameters and the frequency of their measurement depend on the assignment of the project under investigation and are strictly regulated by the respective regulatory framework. Sanitary parameters are divided into index parameters
that reflect the level of fecal pollution and indicator parameters that reflect the quality of water treatment. Index parameters include: Escherichia сoli, thermotolerant coliforms and coliphages. Indicator parameters are: total microbial count, total coliforms, sulfite-reducing clostridia spores etc. Determination of some pathogenic and opportunistic pathogenic bacteria like salmonella, pathogenic staphylococcus, blue pus bacillus etc. is an important aspect of water bodies monitoring. EC countries moved from determining groups of sanitary indicator microorganisms (thermotolerant coliforms, fecal staphylococcus, sulfite-reducing clostridia spores) to determining directly sanitary indicator microorganisms (Escherichia coli, Enterococcus faecalis, Clostridium perfringens), which makes water quality assessment more standardized and reliable. Advanced methods and approaches to the assessment of the sanitary state of the water bodies are continuously emerging and introduced in the international practice of sanitary surveys.
Key words
potable water , water quality , total coliform bacteria , sanitary index , index parameter , indicator parameter , Escherichia coli , thermotolerant coliforms , coliphages , total microbial count , salmonella , P. aeruginosa , S. aureus , sanitary microbiological assessment , sanitary indicator microorganism , chromogenic substratum
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УДК 628.16:504.064
Sokolov D. M., Netchayev D. N.
Petrifilms (3M™ Petrifilm™) – innovative test-systems for microbial water quality monitoring
Summary
The specific features and benefits of the express method of microbiologic water quality monitoring with 3М™ Petrifilm™ are considered. 3М™ Petrifilm™ is an advanced medium standard used in Russia and abroad for microbiologic monitoring of food products, beverages and water quality. The 3М™ Petrifilm™ shelf life as long as dehydrated culture media; at the same time 3М™ Petrifilm™ is much easier to use. One of the main advantages of 3М™ Petrifilm™ is that there is no stage of culture media preparation. The main types of The 3М™ Petrifilm™ Aqua Plates for water testing are tests for determination of the number of heterotrophic bacteria (total microbial count), coliforms and enterobacteria (glucose-positive coliform bacteria), yeast and mold. The target microorganisms are determined from the growth on the selective medium, occurrence of acidification zone and gas formation. 3М™ Petrifilm™ Aqua Plates ensure valid and reliable results of analyzing drinking water by direct inoculation and membrane filtration.
Key words
potable water , microbiological analysis , total coliform bacteria , termotolerant coliform bacteria , glucose-positive coliform bacteria , TVC , membrane filtration , Petrifilms , 3М™ Petrifilm™ Aqua Plates
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