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Human infectious diseases are among the most serious effects of water pollution, especially in developing countries, where sanitation may be inadequate or non-existent. Waterborne diseases occur when parasites or other disease-causing microorganisms are transmitted via contaminated water.

E. coli bacteria (left plate) thrive in water sources, but are easily killed through solar water pasteurization (right plate)Children are especially susceptible to the polluted water diseases. An estimated 1.5 billion cases of diarrhea occur each year, resulting in the death of nearly 2 million children. Worldwide, about 1.3 billion people do not have access to safe drinking water, including nearly half the population of sub-Saharan Africa. Yet, in many of the most severely affected regions, sunshine is an abundant source of energy that can not only cook food but can also heat water to temperatures that kill harmful microbes, making water safe to drink. This procedure is called solar water pasteurization.

Most people know contaminated water can be made safe by boiling. What is not well known is that contaminated water can be pasteurized at temperatures well below boiling, as can milk, which is commonly pasteurized at 71°C (160°F) for 15 seconds.

Water sterilization unitThe data below indicates the temperatures at which the most common waterborne pathogens are rapidly killed, thus resulting in at least 90 percent of the microbes becoming inactivated in one minute at the given temperature.

Worms, Protozoa cysts (Giardia, Cryptosporidium, Entamoeba) - Killed Rapidly At 55°C (131°F)
Bacteria (V. cholerae, E. coli, Shigella, Salmonella typhi), Rotavirus - Killed Rapidly At 60°C (140°F)
Hepatitis A virus - Killed Rapidly At 65°C (149°F)

  (Significant inactivation of these microbes actually starts at about 5°C (9°F) below these temperatures, although it may take a couple of minutes at the lower temperature to obtain 90 percent inactivation.)



In April 2010 Sungrill introduced new water modules with 5 and 10 liters capacity. Both were successfuly presented at 2010 European Solar Days. Water modules are very robust and equiped with tap, security valve and thermomether for maximum safety and comfort. Again, it is important to emphasise that on a regular sunny day, it takes only about 20 minutes to bring 5 liters of water to the boling point. That means, that one SunGrill could easily cater for all safe water needs of a small community.

Water sterilization unit

sungrill water sterilization unit


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