Lec_14_Transport of Waterborne

Lec_14_Transport of Waterborne - Fate and transport of...

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Fate and transport of pathogens in water Gwy-Am Shin Office: Suite 2335, 4225 Roosevelt Phone: 206-543-9026 Email: gwyam@u.washington.edu
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Topics Source of waterborne pathogens Removal of waterborne pathogens Wastewater treatment processes Natural processes Persistence of waterborne pathogens in the environment Agent factors Environmental factors
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The source of waterborne pathogens Environment Mycobacterium avium : drinking water distribution systems Legionella pnemophilia : hot water systems Infected hosts
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Incidence and concentration of enteric pathogens in feces (USA) Pathogen Incidence (%) Concentration(/gram) Enteric virus 10-40 10 3 -10 8 Hepatitis A 0.1 10 8 Rotavirus 10-29 10 10 -10 12 Salmonella 0.5 10 4 -10 10 Giardia 3.8 18-54 10 6 10 6 Cryptosporidium 0.6-20 27-50 10 6 -10 7 10 6 -10 7
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A simple calculation Incidence = 10%, Concentration = 10 6 /gram of feces US population (250 million (10 6 )) X incidence (10 %) = 25 million (10 6 ) cases/year Cases (25 million (10 6 )) X concentration (1 million (10 6 )/gram) X average weight of feces (500 gram) = 12.5 X 10 15 /year (12.5 X 10 15) X frequency of defecation (5) = 62.5 X 10 15 /year 62.5 X 10 15 / 365 days = 171 X 10 12 /day
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Typical municipal wastewater treatment system
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Sewer systems
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Concentration of enteric pathogens in raw sewage (USA) Organism Concentration (/liter) Enteric virus 10 4 -10 5 Salmonella 10 3 -10 5 Clostridium perfringens 10 4 -10 7 Cryptosporidium oocysts 10 2 -10 4 Giardia cysts 10 2 -10 5
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wastewater treatment processes
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Lec_14_Transport of Waterborne - Fate and transport of...

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