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Learn how water filters have been used throughout history to improve the safety and aesthetics of water. Discover the origins of sand filtration, chlorination, softening, and other methods of water treatment.
Learn about the process of removing undesirable chemicals, biological contaminants, and other impurities from water for various purposes. Compare different methods of water purification, such as filtration, disinfection, distillation, and desalination, and their advantages and disadvantages.
An intermittent slow sand filter was constructed and operated at Lawrence, Massachusetts in 1893 due to continuing typhoid fever epidemics caused by sewage contamination of the water supply. [18] The first continuously operating slow sand filter was designed by Allen Hazen for the city of Albany, New York in 1897. [19]
This web page explains various techniques to purify water from untreated sources for drinking purposes, such as heat, filtration, chemical disinfection, and ultraviolet purification. It does not mention halazone, a chemical disinfectant that is no longer used due to health and environmental concerns.
Slow sand filters are water purification systems that use a biofilm on the sand surface to remove contaminants. They are typically 1–2 m deep and require a large area for the sand bed and the water storage.
Some industrial processes, notably in the semiconductor and pharmaceutical industries, need large amounts of very pure water. In these situations, feedwater is first processed into purified water and then further processed to produce ultrapure water.
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