Page History

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In 1854, English physician John Snow halted a deadly outbreak of cholera by simply removing the handle from the water pump of the affected London neighborhood. In doing so, he proved that cholera, like many other diseases, is easily transmitted through water sources contaminated with what we now know to be microscopic organisms (bacteria and viruses). Denying the people of Broad Street access to the contaminated water was an effective way for Snow to stop the spread of Vibrio cholerae, but such drastic measures are usually not necessary today. Instead, water can be treated to remove the suspended bacteria before it is passed along to the general population. Though there are many different ways to build a water treatment plant, most rely on the same general process:

The Water Treatment Process

1. Combine all of the suspended particles (including clay, dirt, and organisms such as bacteria) into larger bunches of particles. This process is called flocculation and uses a coagulant to bond the dissolved particles into flocs.
2. Allow the heavier, flocculated particles to settle out of the mixture. This process typical takes place in a sedimentation tank designed to maximize the range of particle speeds & sizes it can capture.
3. Filter the water to remove any of the lighter flocs that escaped sedimentation.
4. Dose the water with chlorine to kill any remaining disease-spreading organisms.

Performance Data

1. Wash4All Data
2. POST App Data

Useful Links

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Project Sites 

Program Director Monroe Weber-Shirk's Lecture Slides for Intro to Water Treatment: Water Treatment.pptx

Research methodology and current areas of focus: Research
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