Filtration
Filtration separates solid matter from the water. The turbid liquid (non-filtered water) is passed through the filter. As the water passes through the filter, larger particles get left behind. The purified water is referred to as the filtrate. Most water plants use pressure filtration where atmospheric pressure or man-made pressure is used to force the water through the filter.
In the water purification process, filtration is used to separate from the water materials with different chemical compounds. Filtration removes the particles that did not settle in previous purification steps. For drinking water, membrane filters are used to remove all particles larger than .2 um. However, filtration cannot remove particles dissolved into the water, such as phosphorous.
http://www.konia.com.au/technology_water_filtration.php This is a link to a photo of the process of filtering smaller and smaller size particles.
http://water.me.vccs.edu/courses/ENV195Micro/lesson7_4.htm At the bottom of this page is a rought sketch of how filtration works.
http://www.yamit-f.com/english/Article.aspx?Item=651 This page features a picture showing the different sizes of particles filtered based on how the filter is spaced out internally.
http://www.lenntech.com/chemistry/filtration.htm
http://en.wikipedia.org/wiki/Water_purification#Filtration
http://en.wikipedia.org/wiki/Filtration
Coagulation
A chemical with a positive charge such as alum is used in the water which neutralizes negative charges in unwanted paricles which then easily clumps the particles together and causes them to sink to the bottom where they can easily be removed.
Coagulation removes unwanted particles such as dirt, clay, and other particles.
http://www.youtube.com/watch?v=9z14l51ISwg
http://en.wikipedia.org/wiki/Coagulation
Filtration separates solid matter from the water. The turbid liquid (non-filtered water) is passed through the filter. As the water passes through the filter, larger particles get left behind. The purified water is referred to as the filtrate. Most water plants use pressure filtration where atmospheric pressure or man-made pressure is used to force the water through the filter.
In the water purification process, filtration is used to separate from the water materials with different chemical compounds. Filtration removes the particles that did not settle in previous purification steps. For drinking water, membrane filters are used to remove all particles larger than .2 um. However, filtration cannot remove particles dissolved into the water, such as phosphorous.
http://www.konia.com.au/technology_water_filtration.php This is a link to a photo of the process of filtering smaller and smaller size particles.
http://water.me.vccs.edu/courses/ENV195Micro/lesson7_4.htm At the bottom of this page is a rought sketch of how filtration works.
http://www.yamit-f.com/english/Article.aspx?Item=651 This page features a picture showing the different sizes of particles filtered based on how the filter is spaced out internally.
http://www.lenntech.com/chemistry/filtration.htm
http://en.wikipedia.org/wiki/Water_purification#Filtration
http://en.wikipedia.org/wiki/Filtration
http://www.youtube.com/watch?v=aGE4xqEBBH8 Another video, featuring how membrane filtration in particular is used to filter water, specifically in the company Aquasource.
Coagulation
A chemical with a positive charge such as alum is used in the water which neutralizes negative charges in unwanted paricles which then easily clumps the particles together and causes them to sink to the bottom where they can easily be removed.
Coagulation removes unwanted particles such as dirt, clay, and other particles.
http://www.youtube.com/watch?v=9z14l51ISwg
http://en.wikipedia.org/wiki/Coagulation
http://www.youtube.com/watch?v=OMZpzcItQkc This video deals with filtration and coagulation, as well as some purification methods not discussed in our blog.
Floculation or floculant - a substance that promotes the clumping of particles.
The floculant goes into the water and causes particles in the water to clump together.
The substances are clumped together and either float to the top (creaming) or settle to the bottom (sedimentation). Once the particles do one or the other they have to be filtered out.
http://en.wikipedia.org/wiki/Flocculation
Disinfection or Disinfectant - the process or treatment to destroy harmful microorganisms in water
The disinfectant is let into the water source and kills or deactivates any harmful substances, making it so that substance can't reproduce and further contaminate the water.
Disinfectants purify the water by deactivating substances, not just filtering out harmful particles.
www.lenntech.com/processes/disinfection/what-is-water-disinfection.htm
Floculation or floculant - a substance that promotes the clumping of particles.
The floculant goes into the water and causes particles in the water to clump together.
The substances are clumped together and either float to the top (creaming) or settle to the bottom (sedimentation). Once the particles do one or the other they have to be filtered out.
http://en.wikipedia.org/wiki/Flocculation
Disinfection or Disinfectant - the process or treatment to destroy harmful microorganisms in water
The disinfectant is let into the water source and kills or deactivates any harmful substances, making it so that substance can't reproduce and further contaminate the water.
Disinfectants purify the water by deactivating substances, not just filtering out harmful particles.
www.lenntech.com/processes/disinfection/what-is-water-disinfection.htm
What methods does our water go through to become purified?
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteDoes filtration get out all contaminants from water or only some?
ReplyDeleteThere are some particles that are dissolved into the water that cannot be removed, like phosphorous.
DeleteWhere does the water in this area of the US become purified?
ReplyDeleteWe have a water treating facility right by highlands. most call it the Reservoir a.k.a the big lake with the fence around it.
ReplyDelete