By: Inzar Khan
30% of the world's irrigated areas suffer from salinity problems and remediation is seen to be very costly
Cons of Desalination
- Very costly (leads to economic problems)
- Many problems if leftover water is dealt in a bad way
- Problems for ocean ecosystem
- Not very efficient
- Ruins basis of food web
- Takes two times the amount of saltwater than the freshwater produced
- Discharge water will be too salty; endangers marine life when put back into the ocean
Among industrialized countries, the United States is one of the most important users of desalinated water, especially in California and parts of Florida. The cost of desalination has kept desalination from being used more often.
- "Salt" Water
- Metal Pot
- Ceramic Bowl
- Block of Wood
- Plastic Bags
Design of the Desalination Model
- The block of wood is in the center of the metal pot, with the "salt" water around it.
- On top of the wood, there is the ceramic bowl, which will catch the fresh water.
- The metal pot is covered with foil.
- Ice is on top of the foil inside of plastic bags.
Process of Desalination
How Does It Work
- Pour the "salt" water into the pan.
- Throughout the process of desalination, the salt water will turn into fresh water and will collect in the ceramic bowl in the middle of the pot.
- The salt water is heated, and evaporates to the top of the pan.
- the ice is centered in the middle of the top of the pot, and it will allow the evaporated water to condensate on the foil.
- Then it will dip down into the bowl in the middle of the pan.
- The salt will be left behind, at the base of the pot.
- It evaporated to the top of the pan, separating the salt from the fresh water.
- It condensates at the top of the pan.
- The ice melted, because of the heat.
We learned that we should not use wood in our model, since it ruins the data.
In 2002 there were about 12,500 desalination plants around the world in 120 countries. They produce some 14 million cubic meters/day of freshwater, which is less than 1% of total world consumption.