2 8-year-old girls built a salt-water-purifying device with solar energy

Just need simple tools worth less than 200,000 VND, two girls Nguyen Thi Thu Ngan and Nguyen Thi Yen Linh (grade 8A3, Thuan Hung Junior High School, Long My town, Hau Giang) have made water purification equipment. By solar energy helps life.

Talking about the idea of ​​making this unique device, Thu Ngan said that the countryside she has been invaded by saltwater in the past, many families do not have enough water for living, so I always think about making a water filter device to help her. baby With that in mind, Yen Linh and Thu Ngan registered to participate in the Hau Giang Province Green Innovation Contest in 2016. Mr. Pham Van Loan, a Math - Informatics teacher at Thuan Hung Secondary School, said: "Seeing two I have the same idea so the school decided to let Ngan and Linh work together to create water purification equipment and I am responsible for supporting them. "

Thay Loan instructs Yen Linh and Thu Ngan to complete the filtration equipment.

According to Yen Linh, when they agreed to make the salt water filter into fresh water , they began to sketch out the pictures, then find materials to do. "After a lot of research and debate, I and Thu Ngan unified to use solar energy to filter salt water into fresh water, and together improve the design on paper to start working , " Yen Linh said. .

Materials such as foam boxes, water bottles, pipes, glass panels used by the children in the family and brought to school to work together with determination to produce water filtration equipment. From the designs on the drawings, Thu Ngan and Yen Linh were specific to the materials they found and then installed them."However, in the process of fitting and testing, we started to develop many things that when we visualized and drew, we did not anticipate it all. For example, using only 1 plate of rapidly evaporating water glass does not condense due to heat too, then when the water has stopped condensing, don't concentrate to escape . ", Thu Ngan said.

"Although it is quite hard, the two of them persist in installing and testing. As a instructor, I cannot help directly but only suggest that they apply the right knowledge into practice. Good at studying physics, so when I suggest you know what knowledge to use, and yes, you have used the knowledge of evaporation and condensation of water to perfect the filter system " , teacher Loan said.

Equipment to filter salt water into fresh water of Ngan and Linh.

With perseverance, patience and intelligence, quickness in handling situations, finally the salt water filtration system into Thu Ngan and Yen Linh has successfully tested after 2 months of research. The construction of the device when completed is quite simple: just a foam box, the black plastic-covered inside helps absorb sunlight from lenses, prisms and a glass plate that is used to increase reflection. of sunshine. Along with that are two bottles used to store drinking water and hot water, some pipes, water collection valves. The model is quite simple, easy to find materials, if widely used, people no longer fear the lack of water use due to alum water, salinity. This device can be placed anywhere with light, can be both on the roof, time to turn saltwater, water contaminated with alum into relatively short freshwater.

"Only a small foam box but can filter out about 6 liters of fresh water / day. In the context of saline intrusion like last time, while many poor families in rural areas cannot equip expensive water filtration systems. money, the cost of the system was made by Yen Linh and Thu Ngan less than 200,000 VND, very suitable for poor households in remote areas, their ideas also contribute to protecting natural resources and protecting lips School, anti-climate change, " Mr. Lo said.

Thu Ngan (left) and Yen Linh put salt water into the filter system.

The filtering system of Thu Ngan and Yen Linh with practical applicability in each household has been organized for the Green Innovation Contest in Hau Giang province in 2016, highly appreciated and ranked first.

With an achievement of 8 years as a good student with encouragement, guidance of teachers and winning the first prize in the contest . hope that the passion of scientific discovery of two girls Thu Ngan and Yen Linh on The more is maintained and enhanced. And they will have more products to serve the community.