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Chlorination in piped systems

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[[Image:chlorination in piped.jpg|thumb|right|300px|Floating bowl chlorinator can be placed in tanks or reservoirs. Photo: WHO.]]

Chlorination is a chemical method for disinfecting water. The chlorine inactivates pathogens in the water and provides a barrier against recontamination. It is normally applied at the last stage of a drinking-water treatment process. The most frequently used low-cost technology methods are batch chlorination and flow chlorination. For batch chlorination, a concentrated chlorine solution is added to the water in a reservoir, with both inlets and outlets closed. The water is stirred and the chlorine is left to react for at least 30 minutes. After that,

the outlets can be opened. When the reservoir is empty, the outlets are closed and the reservoir is refilled with a new batch of water to be disinfected.

Flow chlorinators continuously feed small quantities of a weak chlorine solution to a flow of fresh water, often at the inlet of a clear-water reservoir. Usually, a small reservoir containing the chlorine solution is placed on top of the water reservoir and the solution is administered close to the point where fresh water comes in, and turbulence guarantees good mixing. A special device, such as the floating bowl chlorinator, enables precise dosage. Sometimes a special electric pump is used for this purpose. Electrical devices that convert a solution of kitchen salt to active chlorine can be purchased for on-site chlorine production. Small test kits are also available for monitoring and for adjusting chlorine doses to the water quality and quantity. Chlorine-producing compounds must always be stored and prepared with care.

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