WATER PURIFICATION by maywashere

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WATER PURIFICATION

Published on Nov 20, 2015

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PRESENTATION OUTLINE

WATER PURIFICATION

How are unwanted ions removed from drinking water?

Photo by Jason A. Samfield

Water, in many cases, will have impurities. These impurities can range from insoluble substance such as sand to soluble substances such as ions.

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Photo by Don J Schulte

All insoluble substances, such as sand and dirt, can be removed through filtration.

Photo by Matthias Rhomberg

On the other hand, soluble substances, such as ions, must be removed through a process called ion exchange.

Photo by adonofrio (Biology101.org)

Ion exchange works by exchanging ions that are in the impure water for something more sanitary.

Photo by János Rusiczki

Ion exchange resins are tiny little beads with fixed ions.

Photo by EMSL

For example, an ion exchange resin may contain the fixed ion SO3- bonded with a mobile Na+.

Photo by Pacific Northwest National Laboratory - PNNL

If the water contains a toxic ion with a 1+ charge, then the mobile Na+ ion would change places in the resin with the toxic ion to remove the toxic ion.

Photo by Sprengben [why not get a friend]

In many cases, ion exchange is used to remove water hardness. Water hardness is when there is an excessive amount of Ca2+ and Mg2+ ions in the water.

Photo by VinothChandar

10.

By using ion exchange resins, the Ca2+ and Mg2+ can be removed from the water and replaced with an ion that is more safe to drink.

Photo by Jocey K

11.

Another use for ion exchange is deminerilisation. This will use H+ and OH- ions to remove the toxic ions present in the water completely.

Photo by monkeyc.net

12.

By having mobile H+ & OH- ions in the ion exchange resins, these ions will be replaced by the toxic ions in the water. Once the H+ and OH- ions are in water, they will combine to create H2O.

Photo by Don J Schulte

13.

Reactions must occur

Problems with ion exchange:

14.

If the ions do not change places within the resins, then there will be no ion exchange. In order to prevent no reaction from happening, there must be a difference in affinity between the two ions being exchanged.

Photo by TaylorMiles

15.

Overall, ion exchange is one of the main methods for water purification. It removes the unwanted ions in water effectively. For those impurities that are still present after ion exchange, there are other methods as well.

Photo by joiseyshowaa

16.

Slide Notes

WATER PURIFICATION

PRESENTATION OUTLINE

WATER PURIFICATION

Water, in many cases, will have impurities. These impurities can range from insoluble substance such as sand to soluble substances such as ions.

All insoluble substances, such as sand and dirt, can be removed through filtration.

On the other hand, soluble substances, such as ions, must be removed through a process called ion exchange.

Ion exchange works by exchanging ions that are in the impure water for something more sanitary.

Ion exchange resins are tiny little beads with fixed ions.

For example, an ion exchange resin may contain the fixed ion SO3- bonded with a mobile Na+.

If the water contains a toxic ion with a 1+ charge, then the mobile Na+ ion would change places in the resin with the toxic ion to remove the toxic ion.

In many cases, ion exchange is used to remove water hardness. Water hardness is when there is an excessive amount of Ca2+ and Mg2+ ions in the water.

By using ion exchange resins, the Ca2+ and Mg2+ can be removed from the water and replaced with an ion that is more safe to drink.

Another use for ion exchange is deminerilisation. This will use H+ and OH- ions to remove the toxic ions present in the water completely.

By having mobile H+ & OH- ions in the ion exchange resins, these ions will be replaced by the toxic ions in the water. Once the H+ and OH- ions are in water, they will combine to create H2O.

Reactions must occur

If the ions do not change places within the resins, then there will be no ion exchange. In order to prevent no reaction from happening, there must be a difference in affinity between the two ions being exchanged.

Overall, ion exchange is one of the main methods for water purification. It removes the unwanted ions in water effectively. For those impurities that are still present after ion exchange, there are other methods as well.

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Slide Notes

WATER PURIFICATION

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PRESENTATION OUTLINE

WATER PURIFICATION

Water, in many cases, will have impurities. These impurities can range from insoluble substance such as sand to soluble substances such as ions.

All insoluble substances, such as sand and dirt, can be removed through filtration.

On the other hand, soluble substances, such as ions, must be removed through a process called ion exchange.

Ion exchange works by exchanging ions that are in the impure water for something more sanitary.

Ion exchange resins are tiny little beads with fixed ions.

For example, an ion exchange resin may contain the fixed ion SO3- bonded with a mobile Na+.

If the water contains a toxic ion with a 1+ charge, then the mobile Na+ ion would change places in the resin with the toxic ion to remove the toxic ion.

In many cases, ion exchange is used to remove water hardness. Water hardness is when there is an excessive amount of Ca2+ and Mg2+ ions in the water.

By using ion exchange resins, the Ca2+ and Mg2+ can be removed from the water and replaced with an ion that is more safe to drink.

Another use for ion exchange is deminerilisation. This will use H+ and OH- ions to remove the toxic ions present in the water completely.

By having mobile H+ & OH- ions in the ion exchange resins, these ions will be replaced by the toxic ions in the water. Once the H+ and OH- ions are in water, they will combine to create H2O.

Reactions must occur

If the ions do not change places within the resins, then there will be no ion exchange. In order to prevent no reaction from happening, there must be a difference in affinity between the two ions being exchanged.

Overall, ion exchange is one of the main methods for water purification. It removes the unwanted ions in water effectively. For those impurities that are still present after ion exchange, there are other methods as well.

Untitled Slide

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