- 1 Water Treatment
- 2 stages of the treatment of potable water 2.1 coagulation 2.2 Sedimentation 2.3 Nomination 2.4 Sterilization 2.5 solar-powered water purification
- 2.1 coagulation
- 2.2 Sedimentation
- 2.3 Nomination
- 2.4 Sterilization
- 2.5 solar-powered water purification
- 3 References
Goal is to resort to the water surface treatment such as: lakes, or reservoirs, or rivers, to get rid of contaminants or organisms, and be through a range of biological processes, chemical and physical, in order to make water safe to drink, as some treatment ways water occur in the natural environment, in terms of others happening in the water treatment plants equipped for that purpose. 
The development of the concept of water treatment in the eighteenth century in Europe, where it spread at the time of cholera in London, and was associated with the outbreak drinking water contaminated with sewage, and that was in 1854, at a time when the United States began using chlorine to disinfect water, Europe had begun using chlorine as well, and when it was discovered the possibility of drinking water treatment using ozone, the American public Health developed the first system of drinking water in the United States in 1914. 
Stages of water treatment potable
There are several stages to the treatment of drinking water, namely:
Is considered the process of coagulation or the first flocculation stages of drinking water treatment typically, where is added positively charged chemicals to the water, which in turn neutralize the negative charge of the dust and other particles dissolved in the water, leading to particles with chemicals that were added to form a material link the largest is called Fluke (in English: floc). 
The objective of the sedimentation basins is to collect as much as possible of suspended solids in the water, which increases its size during the clotting process to facilitate deposition, the deposition process occurs through the introduction of water into the sedimentation basins after the coagulation process finishes, and keep it in ponds for about four hours, and be basins sedimentation rectangular so that water can enter from one of the parties short, or circular shape so that interfere with water from its position and come out of its aspects, and designed sedimentation basin diagonally in the bottom, so as to assemble contaminated and suspended solids at the bottom, and when rising proportion are disposed of through sweeping clays, as the pelvic floor dedicated to pull on the slots contain contaminants. 
Basins wash constantly to get rid of materials that are difficult for sweeping removed, reaching the proportion precipitates of suspended water in sedimentation basins to 90 percent or more, depending on the quality of water, and the way in which the operation of units of sedimentation and coagulation based on the design basins, and it should be noted that the amount of sediment in the bottom of the aquarium depends on the duration of the water retention in the basin, and the depth and speed of the water flow, sedimentation process benzene large weight suspended material and talked down, followed by the smaller material size, while small-sized material is difficult deposited, so still the nomination process. 
There are many filtration methods for treatment of drinking water, so that the method that must be followed on the water quality of the raw, and the process is done through the water flow through the material to remove contaminants from the water, and often the materials used to be a center of granular, such as: coal, molten, or sand or activated carbon, and the types of filtration: a slow sand filtration, high-level filtering, filtering of diatomaceous earth, in addition to another type was used widely in the late nineties and early new millennium, a membrane filtration; So that it is through the flow of water through the endothelial barrier-like membrane coffee strainer, and with the flow of water under pressure across the membrane, are collected contaminants living organisms on the surface of the membrane, but this method is not suitable for severe water pollution, because the solids will clog the membrane almost immediately , the United States is using the nomination process membranous largely for special uses, in addition to the use of other types of filtration. 
It is the sterilization process through the use of sterilization materials such as chlorine gas or chlorine dioxide, as well as it can sterilization through the laurel ozone, or UV, or sodium Hipklorat, but these methods is characterized by certain sterilization in the shadows; Fgaz ozone is running out quickly there is securing the necessary water protection from pollution during transportation, while UV radiation are considered antiseptic momentarily, as Chlorine is material cheaper and easier user-friendly, and is strong on contaminants, so the use of chlorine added to the water tanks before that the water reaches it after the nomination process, and it needs chlorine to react with bacteria and pollutants about 20-30 minutes, but for gas chlorine dioxide, it is considered very harmful; So that leaves a large amount of chlorides compounds are very harmful to humans and chlorate, and it should be noted that there are some additional units in water treatment plants, and to get rid of the high concentration of some impurities such as: chlorination prior, pre-sedimentation, ventilation, and remove intractability. 
Solar-powered water purification
The researchers confirmed that the water purification of solar energy is an effective way to get drinking water, according to the Federal Institute of Swiss Aquatic Science and Technology, it can take advantage of solar energy for water purification, through filling water bottles, then put it in the sun for six hours, so as to do UV rays to kill parasites, bacteria and viruses in the water, and is promoted to this method in developing countries; Because it is an effective way to purify water even if the water temperature and the air is low. 
- ^ أ ب ت "water-treatment", www.encyclopedia.com, Retrieved 2018-4-1. Edited.
- ↑ "water_treatment", www.cdc.gov, Retrieved 2018-4-1. Edited.
- ^ A b T. Mohammed Jassim Mohammed under the supervision of Dr. Bright Bayati (2010), evaluate the performance of the unit project for water treatment, Page 16-17,20-23. Edited.
- ↑ ANN WOLTERS (2017-10-3), "natural-ways-to-purify-lake-water-for-drinking"، www.livestrong.com, Retrieved 2018-4-1. Edited.
We regret it!
Successfully sent, thank you!