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Assessment of the Risk Associated with E. coli Bacterial Intrusion in Drinking Water Distribution Networks

  • Research Article - Civil Engineering
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Abstract

Maintaining clean drinking water is a key factor in maintaining sustainable development and a healthy environment. Thus, in many countries, the safety of drinking water is a key goal which is expected to be achieved in water distribution networks (WDNs). This experimental study was performed to assess the risks of E. coli bacterial intrusion into drinking WDNs. Three different scenarios are examined: (a) intrusion of E. coli bacteria during a sudden power shutdown associated with low or negative pressures; (b) planned intrusion through direct injection into the network using a high-pressure dosing pump; (c) premeditated or accidental E. coli contamination of water sources (tanks). While running the three scenarios, it was found that the rate at which bacteria reach customers is very comparable; however, higher risks are found with premeditated bacterial intrusion. The theory that contaminants immediately intrude into water networks through cracks and loose joints after a power shutdown accompanied by low/negative pressure was tested. It was found that there is a slim chance for E. coli and other contaminants to find a path into the system after sudden low/negative pressure events. High pressure within water networks pumps out water from the system, and then, the mixture (water and contaminants) is sucked back into the network if enough time is allowed after the power shuts down. Results show that it takes from 3.5–20 s for contaminants to intrude into the system after a sudden power outage if the network maintained an operating pressure between 1 and 4 bar prior to the shut down of the water pumps. This does not allow contaminants to enter the network unless there is a long-power shutdown that allows the contaminants to be sucked into the system. The minimum time required for contaminants to intrude into the system was found to depend on the water pressure prior to the power shut down. Meanwhile, it was found that bacteria directly injected to the system represent a major risk as it takes only 30–90 s for the contaminants to reach the customer at an operating pressure of 1–3 bar.

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References

  1. Khanal, N.; Buchberger, S.G.; Mckenna, S.A.; Clark, R.M.; Grayman, W.M.: Vulnerability assessment of water distribution system to chemical intrusions. World Water Environ. Resour. Congr. 56, 1 (2005)

    Google Scholar 

  2. Kirmeyer, G.J.; Friedman, M.; Martel, K.D.; Noran, P.F.; Smith, D.: Practical guidelines FOR maintaining distribution system water quality. J. Am. Water Works Assoc. 93(7), 62–73 (2001)

    Article  Google Scholar 

  3. Abo-Munasar, A.: Decision Support System for Risk and Water Quality Management in Water Distribution Network. King Fahd University of Petroleum and Minerals, Dhahran (2014)

    Google Scholar 

  4. Islam, N.; Farahat, A.; Al-Zahrani, M.A.M.; Rodriguez, M.J.; Sadiq, R.: Contaminant intrusion in water distribution networks: review and proposal of an integrated model for decision making. Environ. Rev. 23(3), 337–352 (2015)

    Article  Google Scholar 

  5. Isovitsch, S.; Vanbriesen, J.: Sensor placement and optimization criteria dependencies in a water distribution system. J. Water Resour. Plan. Manag. 134(2), 186–196 (2008)

    Article  Google Scholar 

  6. LeChevallier, M.W.; Babcock, T.M.; Lee, R.G.: Examination and characterization of distribution system biofilms. Appl. Environ. Microbiol. 53(12), 2714–2724 (1987)

    Google Scholar 

  7. Douterelo, I.; Boxall, J.B.; Deines, P.; Sekar, R.; Fish, K.E.; Biggs, C.A.: Methodological approaches for studying the microbial ecology of drinking water distribution systems. Water Res. 65, 134–156 (2014)

    Article  Google Scholar 

  8. Pirnie, M.; Szewzyk, U.; Szewzyk, R.; Manz, W.; Schleifer, K.H.: Microbiological safety of drinking water. Annu. Rev. Microbiol. 54, 81–127 (2000)

    Article  Google Scholar 

  9. Hellard, M.E.; Sinclair, M.I.; Hogg, G.G.; Fairley, C.K.: Prevalence of enteric pathogens among community based asymptomatic individuals. J. Gastroenterol. Hepatol. 15(3), 290–293 (2000)

    Article  Google Scholar 

  10. Somashekar, K.M.; Mahima, M.R.; Manjunath, K.C.: Contamination of water sources in Mysore City by pesticide residues and plasticizer—a cause of health concern. Aquat. Proc. 4, 1181–1188 (2015)

    Article  Google Scholar 

  11. Admassu, M.; Wubshet, M.; Gelaw, B.: A survey of bacteriological quality of drinking water in North Gondar. Ethiop. J. Heal. Dev. 18(2), 113–135 (2004)

    Google Scholar 

  12. Qu, X.; Alvarez, P.J.J.; Li, Q.: Applications of nanotechnology in water and wastewater treatment. Water Res. 47(12), 3931–3946 (2013)

    Article  Google Scholar 

  13. Edberg, S.C.; Rice, E.W.; Karlin, R.J.; Allen, M.J.: Escherichia coli: the best biological drinking water indicator for public health protection. J. Appl. Microbiol. 88(S1), 106S–116S (2000)

    Article  Google Scholar 

  14. Hellard, M.E.; Sinclair, M.I.; Forbes, A.B.; Fairley, C.K.: A randomized, blinded, controlled trial investigating the gastrointestinal health effects of drinking water quality. Environ. Health Perspect. 109(8), 773–778 (2001)

    Article  Google Scholar 

  15. Murphy, H.M.; Thomas, M.K.; Schmidt, P.J.; Medeiros, D.T.; McFadyen, S.; Pintar, K.D.M.: Estimating the burden of acute gastrointestinal illness due to Giardia, Cryptosporidium, Campylobacter, E. coli O157 and norovirus associated with private wells and small water systems in Canada. Epidemiol. Infect. 144(7), 1355–1370 (2016)

    Article  Google Scholar 

  16. Douterelo, I.; Boxall, J.B.; Deines, P.; Sekar, R.; Fish, K.E.; Biggs, C.A.: Methodological approaches for studying the microbial ecology of drinking water distribution systems. Water Res. 65, 134–156 (2014)

    Article  Google Scholar 

  17. Lin, Y.W.; Li, D.; Gu, A.Z.; Zeng, S.Y.; He, M.: Bacterial regrowth in water reclamation and distribution systems revealed by viable bacterial detection assays. Chemosphere 144, 2165–2174 (2016)

    Article  Google Scholar 

  18. Prest, E.I.; Hammes, F.; Kötzsch, S.; Van Loosdrecht, M.C.M.; Vrouwenvelder, J.S.: A systematic approach for the assessment of bacterial growth-controlling factors linked to biological stability of drinking water in distribution systems. Water Sci. Technol. Water Supply 16(4), 865–880 (2016)

    Article  Google Scholar 

  19. Gorchev, H.G.; Ozolins, G.: WHO guidelines for drinking-water quality. WHO Chron. 38(3), 104–108 (2011)

    Google Scholar 

  20. Besner, M.; Prévost, M.; Regli, S.: Assessing the public health risk of microbial intrusion events in distribution systems: conceptual model, available data, and challenges. Water Res. 45(3), 961–979 (2011). https://doi.org/10.1016/j.watres.2010.10.035

    Article  Google Scholar 

  21. Moe, C.L.; Rheingans, R.D.: Global challenges in water, sanitation and health.pdf. J. Water Health 4(1), 41–57 (2006)

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Ashraf Farahat

  2. Department of Civil and Environmental Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Mohammed T. Mahmoud

  3. Department of Life Sciences, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Amjad Khalil

Authors
  1. Ashraf Farahat
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  2. Mohammed T. Mahmoud
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  3. Amjad Khalil
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Correspondence to Ashraf Farahat.

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Farahat, A., Mahmoud, M.T. & Khalil, A. Assessment of the Risk Associated with E. coli Bacterial Intrusion in Drinking Water Distribution Networks. Arab J Sci Eng 44, 4161–4168 (2019). https://doi.org/10.1007/s13369-018-3344-6

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  • DOI: https://doi.org/10.1007/s13369-018-3344-6

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