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Ocena mikrobiologiczna osadów wodociągowych, na przykładzie wybranego Systemu Zaopatrzenia w Wodę

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Warianty tytułu
EN
The Microbiological Evaluation of Deposits Come from Water Network on the Example of Selected Water Supply System
Języki publikacji
PL
Abstrakty
EN
The study described herein was carried out on a technical scale on a water supply system servicing approximately 350 thousand inhabitants. The total length of the water mains and distribution pipelines in the area under review approximates 1 744 km and 37 264 water supply connections. The greater part of the water supply area is compact, and a region (a maximum located to the south) is clearly separated from the rest. Because the Waterworks Company, which manages the examined SDW, does not exploit its own intakes and water treatment plants, it has to purchase the water from two external suppliers (D-1 and D-2). The studied area is supplied with water from water mains through 21 points (P1-P21) which, in many cases, are also points of water pressure reduction (reduction stations) or elevation (pumping stations). In 8 of the 21 points of purchase, through appropriate installations, phosphate corrosion inhibitors are dispensed to the water. In an article, the microbiological evaluation of deposits collected from five points in the water distribution system was conducted. The analyzed deposits were located at three different materials: cast iron, plastic, and asbestos cement, which in terms of age ranged from 3 to 40 years. Samples of deposits were collected using the same method for various months during one calendar year. Bacteriological analysis of samples included determination of: total number of mesophilic bacteria (growing at 37°C), psychrophilic (growing at 22°C), coliform, faecal coliform (thermotolerant) or E. coli, fecal streptococci, Clostridium perfingens, bacteria of the Pseudomonas genus, bacteria precipitating iron, anaerobic bacteria sulfate reducing (SRB-initiate corrosion processes), actinomycetes and fungi which are the possible contamination of the soil. Results of microbiological testing showed that the surface of the pipes developed biofilm, which is a significant reservoir of microorganisms, which is a phenomenon often occurring in water distribution systems. The analysis showed a variety of deposits in terms of microbiological, depending on the type of material which they were originally placed on. In the case of sediment samples taken from the plastic pipe, the size of the bacteria grown in the two temperatures was several times higher than in the case of samples taken from the cast iron pipe. In the case of the water sample taken from the plastic, the size of bacteria grown at both temperatures exceeded the limit values for water several times.
Rocznik
Strony
815--827
Opis fizyczny
Bibliogr. 19 poz., tab., fot.
Twórcy
  • Politechnika Poznańska
Bibliografia
  • 1. Bylka, J., Szuster-Janiaczyk, A. (2016). The effect of the mixing of water from different sources in the water supply system on tap water quality – a fullscale technical investigation case study. 8th Eastern European Youg Water Professionals Conference, IWA, 11-14 May 2016, Gdansk, Poland.
  • 2. Hallam, N.B., West, J.R., Forster, C.F., Simms, J. (2001). The potential biofilm growth in water distribution systems. Water Research, 35(17), 4063-4071.
  • 3. Heim, T.H, Dietrich, A.M. (2007). Sensory aspects and water quality impacts of chlorinated and chloraminated drinking water in contact with HDPE and cPVC pipe. Water Research, 41, 757-764.
  • 4. Huck, P.M., Gagnon, G.A. (2004). Understanding the distribution system as a bioreactor: a framework for manging hertertotrophic plate count levels. International Journal of Food Microbiology, 92, 347-353.
  • 5. Lethola, M.J. (2002). Microbially available phosphorus in drinking water, National Public Heaalth Institute, Kuopio, Finland, www.ktl.fi.
  • 6. Lethola, M.J. (2004). Removal of soft deposits from the drinking systems improves the drinking water quality. Water Research, 38, 601-610.
  • 7. Momba, M., Makala, N.(2004). Comparing the effect of various pipe materials on biofilm formation in chlorinated and combined chlorine-chloraminated water systems. Water SA 30(2).
  • 8. Ndingue, S., Huck, P.M., Slawson, R.M. (2005). Effects of temrature and biodegradable organic matter on control of biofilms by free chlorine in a model drinking water sistribution system. Water Reaserch, 39(6), 953-964.
  • 9. Niquette, P., Servais, P., Savoir, R. (2000). Impact of pipe materials on densities of fixed bacterial biomass in a drinking water distribution system. Water Research, 34(6), 1952-1956.
  • 10. PN-EN ISO 6887-1 2000- Mikrobiologia żywności i pasz - Przygotowanie próbek, zawiesiny wyjściowej i rozcieńczeń dziesięciokrotnych do badań mikrobiologicznych – Ogólne zasady przygotowania zawiesiny wyjściowej i rozcieńczeń dziesięciokrotnych.
  • 11. PN-EN ISO 9308-1:2014-12 – wersja polska – Jakość wody – Oznaczanie ilościowe Escherichia coli i bakterii grupy coli – Część 1: Metoda filtracji membranowej do badania wód o małej ilości mikroflory towarzyszącej.
  • 12. PN-ISO 4832:2007 – wersja polska – Mikrobiologia żywności i pasz – Horyzontalna metoda oznaczania liczby bakterii z grupy coli – Metoda płytkowa.
  • 13. PN-82C-04615/25 – Oznaczanie paciorkowców kałowych metodą filtrów membranowych i metodą probówkową.
  • 14. PN-EN 26461-1:2001 – wersja polska – Jakość wody – Wykrywanie i oznaczanie ilościowe przetrwalników beztlenowców redukujących siarczyny (clostridia) - Część 1: Metoda namnażania w podłożu płynnym.
  • 15. PN-EN ISO 6222:2004 – wersja polska – Jakość wody – Oznaczanie ilościowe mikroorganizmów zdolnych do wzrostu – Określanie ogólnej liczby kolonii metodą posiewu na agarze odżywczym.
  • 16. PN-ISO 7954:1999 – Mikrobiologia – Ogólne zasady oznaczania drożdży i pleśni – Metoda płytkowa w 25 stopniach C.
  • 17. PN-80 C-04615.24 – Woda i ścieki. Badania mikrobiologiczne. Oznaczanie grup heterotroficznych grup wytracających żelazo, metoda hodowli na pożywce płynnej.
  • 18. Zacheus, O.M, Iivanainen, E.K., Nissinen, T.K., Lethola, M.J., Martikainen P.J. (2000). Bacterial biofilm formation on polyvinyl chloride, polyethylene and staineless steel exposed to ozonated water. Water Research, 34(1), 63-70
  • 19. Zacheus O.M., Lethola M.J., Korhonen L.K., Martikainen P.J. (2001). Soft deposits, the key site for microbial growth in drinkind water distribution networks. Water Research, 35(7), 1757-1765.
Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-8ae7b458-b46b-4afe-aeaa-3505e7a21ea9
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