Essay on Prevention Of Water Purification Dating

Essay on Prevention Of Water Purification Dating

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CONTENTS

INTRODUCTION…………………………………………………………………
- AIM……………………………………………………………………………………..
- HYPOTHESIS…………………………………………………………………………….
MATERIALS…………………………………………………………………….
METHOD………………………………………………………………………..
REULTS…………………………………………………………………………..
DISCUSSION…………………………………………………………………...
CONCLUSION…………………………………………………………………
APENDIX………………………………………………………………………..


INTRODUCTION

Water is one of the most precious resources to the human race, without it survival is impossible. Civilizations all over the globe formed and flourished when an abundance of relatively clean drinking water was available. Problems started to arise however as large groups of people moved from their nomadic and agrarian lifestyles into larger cities surrounding a singular water source, usually a fresh water stream, lake or artesian spring. The likely hood of this water source becoming polluted and then infecting excessive amounts of people suddenly became an extremely prevalent issue. Records of water purification dating back as far as 4000BC listed an array of techniques such as filtering through charcoal, exposing to sunlight, boiling and straining. It wasn’t until the late 1800’s that the existence of microorganisms invisible to the naked eye was determined. This discovery led to the invention of newer and more efficient means of water treatment, on grander scales. However waterborne disease is still proving to be a major issue to modern civilizations. According to the world health organization (WHO), over 3.4 million people die per year as a result of water related diseases, making it the leading cause of disease and death around the world. Tragically most of these casualties are children particularly from Asian and African countries with limited access to clean wate...


... middle of paper ...


...regulated, especially when being used in small amounts of water. Both of these chemicals are however lightweight, low cost and easy to use making them quite efficient for large scale treatment plants.
Filtration is one of the most advanced methods of water purification today. An array of different filtration levels can be achieved depending on the size of the filter pore (refer to appendix 1), with one of the most effective being the semipermeable membrane filter used in reverse osmosis systems (RO). RO membranes are very tight and therefore capable of rejecting almost all pathogens, however they yield slow flow rates and are therefore better suited to household use.
One of the most ancient techniques known to purify water is the effect of sunlight, otherwise better known today as ultraviolet (UV) radiation. The microorganisms DNA and proteins, absorb the sunlight

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