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Portable water :still a challenge
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In developing countries portable water is one of major problems. Portable water is not available at many places.
India has many social problems and frequent water crisis in many States is one of them. Food and drinking water are quite essential for people’s comfortable living. When these two are scarce sometimes people suffer untold miseries.
India suffers from water shortage for cultivation and drinking despite the fact that many big rivers, some of them perennial rivers, flow through some parts of India. In the south there are the Krishna, Godavari, Cauvery, Tamaraparani, Perilya and other rivers. In the north there are the mighty Ganges, Brahmaputra, Indus, Mahanadi and other rivers. Much of the water goes to the sea unused. Though we have much natural resources like water, minerals, abundantly growing crops and so on, we still suffer, because our knowledge of utilising these natural resources to the maximum advantage is inadequate.
The two States that suffer acute water scarcity sometimes are Tamil Nadu and Andhra Pradesh. The water reservoirs in many towns and cities were meant for a small population. Even the drains for carrying sewage water were planned and built for a small population. With the increasing population the water available is inadequate to meet the needs of the people. Investigation should be done whether more reservoirs could be built to augment the supply of drinking water to the people.
Water Crisis in India
When summer is quite severe sometimes what was once a large reservoir of water shrinks to a pool. Both human beings and animals suffer for want of water.
If it rains it rains and rains and there is a flood. Houses built of thatch are submerged in the water. The cultivated crops under deep water rot and perish. When there is inadequate yield of crops there is famine. Rice, wheat, raga and sugar cane are scarce. In fact there is scarcity of every type of grain.
There are two extremes in India. The nation goes without water or there is heavy rain resulting in flood.
While the north suffers from flood sometimes, sometimes the south suffers from inadequate water supply. The cultivated fields do not have enough water and the yield of crops is inadequate. People suffer without enough drinking water.
If the northern and the southern rivers can be linked there will be perennial water supply to all the States. First the rivers in the south have to be linked and then the rivers in the north have to be linked. Then both the southern and the northern rivers have to be linked. This is a colossal project. This project involves cores of rupees. Even if the project of linking the rivers is taken up this year it will take several years for the project to be completed. The project may need a huge financial outlay. .
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Answer:
Portable water purification devices are self-contained, easily transported units used to purify water from untreated sources (such as rivers, lakes, and wells) for drinking purposes. Their main function is to eliminate pathogens, and often also of suspended solids and some unpalatable or toxic compounds.
These units provide an autonomous supply of drinking water to people without access to clean water supply services, including inhabitants of developing countries and disaster areas, military personnel, campers, hikers, and workers in wilderness, and survivalists. They are also called point-of-use (POU) water treatment systems and field water disinfection techniques.
Techniques include heat (including boiling), filtration, activated charcoal adsorption, chemical disinfection (e.g. chlorination, iodine, ozonation, etc.), ultraviolet purification (including sodis), distillation (including solar distillation), and flocculation. Often these are used in combination.