Reverse osmosis diagram © Siemens Stiftung 2016 CC BY-SA 4.0 international

Reverse osmosis diagram

Image

Schematic diagram:
Reverse osmosis is one possible physical method for purifying water using membrane filters.

English, Spanish, German
Image (117.0 kByte)
2018-10-26
In this process, pressure is applied to salty water, pressing it against a semi-permeable membrane with extremely small pores. The pore size allows water molecules of around 0.28 nm to pass through, while salt ions are kept back. (Although salt ions in and of themselves are smaller than water molecules, in this case they are significantly larger due to their bonded hydration shell).
This process is used in large plants around the world to desalinate seawater in areas with shortages of drinking water.

Information and ideas:
In addition to reverse osmosis, there are other membrane filter procedures that differ in the pore size of the membrane:
• Microfiltration
• Ultrafiltration
• Nanofiltration
Illustration
Chemistry; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school
Chemical compound; Drinking water; Nanotechnology; Water treatment
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2016
Stay up-to-date!

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

Media Portal newsletter – register now

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

*Required fields


Language