the microbiology of solar water pasteurization, with...
TRANSCRIPT
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The Microbiology of Solar Water
Pasteurization,
with Applications in East Africa
Robert Metcalf
Professor, Biological Sciences
California State University, Sacramento
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For children in developing
countries, each year
contaminated water causes:
2 million deaths
1.5 billion episodes of diarrhea
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How can contaminated water
be made safe to drink?
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Milk Pasteurization
71.7°C (161°F)
15 Seconds
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Pasteurization of whole
eggs
60°C (140°F)
3.5 min
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D - Value
(Decimal Reduction Time)
Time to cause 90% kill at
a given temperature
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Temperatures which kill pathogens
in contaminated water
Microbe D value < 1 min
Giardia, Cryptosporidium 55°C
E. coli, cholera, typhoid,
Shigella bacteria, rotavirus 60°C
Hepatitis A virus 65°C
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D value, E. coli in water
60°C 40 seconds
62°C 25 seconds
65°C 10 seconds
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Solar Water Pasteurization
Heating water to 65°C (149°F)
in a solar cooker will
pasteurize the water and kill
disease causing microbes
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How can one verify that water
has been heated to 65°C?
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Water Pasteurization Indicator (WAPI)
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Temperatures which kill disease microbespresent in contaminated water
MICROBE KILLED RAPIDLY AT:
Worms, Giardia, Entamoeba,Cryptosporidium 131F (55C)
Escherichia coli, Shigella, cholera, 140F (60C)Typhoid, Rotaviruses, Polioviruses
Hepatitis A virus 149F (65C)
WAPI wax melts 149F (65C)
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Point Source Water Testing in
Developing Countries
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•The most specific of the readily detectable fecal indicators, and the one present in greatest numbers in feces, is Escherichia coli, and it is therefore recommended as the indicator of choice for drinking water.
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Risk Assessment of Water SourcesRisk Level E. coli/sample Colilert MUG #Blue/Petrifilm
Low < 1/10 ml - 0
Moderate 1-9/10 ml + 0
High 1-10/ml + 1-10
Very High > 10/ml + > 10
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•The Solar Water Disinfection (SODIS) process is a simple technology used to improve the microbiological quality of
drinking water. SODIS uses solar radiation to destroy pathogenic microorganisms which cause water borne diseases.
•SODIS is ideal to treat small quantities of water. Contaminated water is filled into transparent plastic bottles and
exposed to full sunlight for six hours.
•Sunlight is treating the contaminated water through two synergetic mechanisms: Radiation in the spectrum of UV-A
(wavelength 320-400nm) and increased water temperature. If the water temperatures raises above 50°C, the
disinfection process is three times faster.
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Sunny
Solutions
Project
Nyakach
Kenya
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Thermotolerant Coliform Test, Kenya
3 tube MPN, 10, 1, 0.1 ml
1.MacConkey’s broth, 37°C, 1-2 days
2. Gas +to BGLB broth, 44°C, 1-2 days
Gas + = Thermotolerant coliforms
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Fuelwood = 79% of Kenya’s
Total Energy
Energy Usage Per Day
Wood = 81 million lbs
Charcoal = 13 million lbs
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