The hottest transparent plastic bottle acts as a g

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Transparent plastic bottles serve as a "good helper" for disinfection.

at present, one in six residents of the earth can't drink safe drinking water. For people in many poor countries who would otherwise have carbon fiber composites eliminated due to high prices, drinking safe water is not an easy thing. The World Health Organization recently launched a plastic bottle + sunshine method for water disinfection, which is expected to meet the basic survival needs of many people

the new method is simple. You only need a few empty plastic bottles, plenty of sunshine and a black background. The process is: place the transparent plastic bottle filled with water horizontally in a flat place and expose it to the sun for five hours. Ultraviolet rays in the sun and the heat it brings [source: Chinese packaging bottle] will kill most pathogenic microorganisms in the water. Unlike heating boiled water, this method of disinfection does not require any fuel. In addition, if you have the conditions to paint the bottom of the plastic bottle black, or put the bottle on a black corrugated iron or plastic cloth, the disinfection effect will be more significant, because the black corrugated iron or plastic cloth can absorb more heat, so as to more thoroughly eliminate bacteria in the water

the World Health Organization named this simple method solar water disinfection (SODIs). Rickard Helmer, head of the health and Environment Department of the organization, said that the market scope will expand sharply every year, and 2.5 million people die from drinking dirty water. If they can get safe and pure water in this way, they don't have to pay the price of losing their lives for it. The safety and reliability of SODIs method has been proved in practice

but this method with almost zero cost is limited to making do with poverty. Martinwegreen, the inventor of this method and a researcher at the Swiss Institute of environmental science and technology, said that although this method is simple and easy, it cannot kill all microorganisms in the water. However, for many countries with plenty of sunshine and lack of funds, the plastic bottle + sunshine method has solved their urgent needs to a great extent

At the same time, the World Health Organization calls on developing countries to pay attention to chlorine disinfection technology. This technology is also simple and effective

according to the survey report released by the World Health Organization a few days ago, in developing countries, 80% - 90% of diseases and more than one third of deaths are related to bacterial infection or chemically polluted water. In Uganda, for example, only 65% of urban residents can achieve sustainable development at the same time, and only 40% of rural residents have access to safe drinking water. Every year, 3.4 million people get sick and die from drinking unclean water or swimming and washing clothes in polluted water, among which common diseases are malaria, dysentery and dracunculiasis

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