Desalination

Explanation

Removal of salt and other minerals from sea water to make it so humans can drink it and industial use. The most common method is where salt water is forced through a membrane that lets the water molecules to pass but blocks the molecules of salt and other minerals.

+ and - effects of the tech on water

Positive- Salt water from the ocean is transfered into drinkable water (fresh water) because drinking salt water could kill you.


Negative- Because it takes 2 gallons of salt water to make 1 gallon of fresh water that's wasting a lot of the water that we have from the oceans. Also the salt after its taken out of the water it just goes to waste too and so w are wasting a lot by desalination.

+ and - effects on tech for humans

Positive- The water is good to drink because it's fresh water instead of salt water.


Negative- Expanding population in desert areas are putting pressure on fresh water supplies making everyone to use desalinization as the best way to let them drink fresh water.

Interesting facts about desalination

-It takes 2 gallons of seawater to make 1 gallon of fresh water

-The world's largest desalination plant is the Jebel Ali desalination plant in the United Arab Emirates.

-Ushally uses extremly large amounts of energy expensive making it cost a lot.

-More than 4,000 ECHOTec desalination systems are operating throughout the world right now.

Materials

-Filters

-Drinking water supply tank

-Osmosis Menbrane units

-Intake tunned

+ and - effects of the tech on enviroment

Positive-Because when the water is clean and fresh you can use it for the environment. example: watering plants, grass, trees and flowers because salt water would kill all of them and they wouldn't grow and if trees couldn't grow we wouldn't have oxygen.


Negative- Environmental concerns to be considered in desalination- site considerations, coastal zone, air pollution from energy, groundwater protection from leachates, and sludge disposal.

long term effects

-Global warming has increased lots around the world and turned landscapes into close deserts. Some fresh water sources are no longer available to hundreds of millions of people around the world.