Innovative Solar Disinfection System for Developing Countries
Good Article on home water filtration.
Do the Water Filters which neither use UV or heating kill Microorganisms?
Thermal or UV and both are needed to kill the microorganisms.
Microorganisms are heat sensitive. Temperatures required to eliminate microorganisms within 60 minutes:
Salmonelle 58 Degrees Celsius
Shigella 54 Degrees Celsius
Vibrio Cholera 45 Degrees Celsius
Entamoeba Histolytica Cysts 50 Degrees Celsius
Giardia Cysts 59 Degrees Celsius
Hookworm Eggs and Larvae 51 Degrees Celsius
Ascaris Eggs 57 Degrees Celsius
Schistosomas 50 Degrees Celsius
Taenia Eggs 51 Degrees Celsius
(Source: SODIS Technical Note# 9,published by EAWAG and SANDEC).
In our Solar Disinfection Unit even in 30 Degrees Celsius Ambient Temperature(February) in South India we are getting around 60 degrees Celsius water temperatures inside bottles.
It can be seen that it is not required to boil the water in order to kill 99.9% of the microorganisms. Heating up water to 50-60 Degrees Celsius for one hour has the same effect.
Our system(6 litres) capacity costs just Rs 1200(About US 25) in South India and it can be manufactured locally Community systems of 50 or 100 litres capacity can be fabricated. What all it requires is exposure to sunlight for 5 to 6 hours(with ambient temperatures around 25 degrees Celsius..
Our Solar Disinfection system is expected to be a boon for developing countries.
Dr.A.Jagadeesh Nellore(AP),India
E-mail: anumakonda.jagadeesh@gmail.com
