Chlorine is the most common and effective disinfectant at the moment is. Among the chlorine-free water purification methods, ultraviolet radiation, the copper and silver ions, ozonation, the use of preparations of the active oxygen of the organic polymer are widespread. In some cases a combination of above mentioned methods is the most effective. Nowadays, new technologies allow to use following methods for water perification. UV-radiation of a certain wavelength and intensity, when exposed for some time to microorganisms, damages their DNA, making them incapable of reproduction. This principle is based on UV disinfection, it kills even those bacteria which ...
Essays on Water Purification
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Background information
The need for clean water for use by humanity has since time immemorial been an area of concern with scientists and scholars inventing methods that prove to be more efficient than their predecessors. The ultimate goal has always been the removal of undesirable chemicals and pathogens that would, however, render the water unfit for human and industrial consumption. In today’s contemporary society, human activity has culminated into pollution of the natural environment including water catchment areas. This has therefore made water unfit for consumption thereby prompting for more cost-effective and efficient methods for purification of this natural resource. ...
Discovery of ultraviolet light
Ultraviolet radiation is very significant in the tanning individual who are interested in making their skin look like leather as well as for vampires killing, yet it cannot be seen or else felt. The question is then, how did people discover existence the existence of ultraviolet light? Although light is comprehensively abundant when it comes from its primary source the sun, and it is tough to get hold of it because it travels at very high speed than anything else globally. Since light is subsequently insubstantial, for many years, individuals managed only to collect a few frequencies without knowing ...
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ORDER AN ESSAY[Client Name] Water is a colourless and odourless liquid, and is very important for human development and survival. It covers 75% of the earth's surface and is mostly found in lakes, rivers and seas. In addition, the human body comprises 78% of water. Water is an interesting molecule and consists of one oxygen atom and two hydrogen atoms. It is covalently bonded and possesses a very interesting characteristic, i.e. polarity. Polarity ensures that water is an effective medium for the dissolution of other polar compounds. In so doing, water is an enabler for many biological reactions (“The Chemistry of ...
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