How do you disinfect contaminated water science fair project?
Let the water cool, and then transfer it to a clean container. To treat the water chemically, first filter the water and then use regular, unscented household bleach. Add two drops of bleach for every quart or liter of water, stir or shake the water, and then let it stand for at least 30 minutes.
How effective is solar disinfection?
Lab Effectiveness, Field Effectiveness, and Health Impact In the laboratory, SODIS has been proven to inactivate the viruses, bacteria, and protozoa that cause diarrheal diseases. In four randomized, controlled trials, SODIS has resulted in reductions in diarrheal disease incidence ranging from 9-86%.
How does solar water disinfection work?
Solar disinfection uses the sun’s ultraviolet (UV) rays to kill microorganisms in water. When a sealed, clear container of water is exposed to sunlight, the UV radiation destroys bacterial, viral, and parasitic pathogens.
Who created solar disinfection?
Macinley Butson (centre) with AWA President Carmel Krogh and Xylem’s Aaron Goth. An Australian inventor has developed a new way to accurately measure UV exposure for solar disinfection of drinking water – and she’s just 18 years old.
Does sunlight purify water?
Water is the very essence of life. Solar radiation can purify water and make it safe to drink. Solar energy from the sun can disinfect water from lakes and rivers. The UV rays from the sun can kill harmful bacteria , parasites, and viruses, given enough exposure.
Can you purify water in the sun?
Just leave a clear glass or plastic bottle out in the sun for six hours. SODIS, or solar water disinfection, is an age-old method touted by the World Health Organization for areas where access to clean water is limited. UV rays in the sunlight tear apart the microbes to make water safe.
Which water sample is hardest?
Mineral water will be the hardest type of water, hence it’s name “mineral” & when you have water with minerals, it takes more soap to be added, meaning its hard water.
When was the Solar disinfection system invented?
Solar disinfection (SODIS) was developed in the 1980s to inexpensively disinfect water used for oral rehydration solutions. In 1991, the Swiss Federal Institute for Environmental Science and Technology began to investigate and implement SODIS as a household water treatment option to prevent diarrhea in developing countries.
How to disinfect water in a science fair?
In this microbiology science fair project, you will investigate the exposure time to UVA light that is required for a bottle of water to be disinfected. You will test different exposure times and compare the results to boiling water.
What are the benefits of solar disinfection in water?
The benefits of Solar Disinfection are: Proven reduction of viruses, bacteria, and protozoa in water. Proven reduction of diarrheal disease incidence.
Is there a way to make solar disinfection zero cost?
SODIS, as a virtually zero-cost technology, faces marketing constraints. Since 2001, local NGOs in 28 countries have disseminated SODIS through training of trainers, educating at the grassroots level, providing technical assistance to partner organizations, lobbying key players, and establishing information networks.