Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property, that is driven by chemical potential differences of the solvent, a thermodynamic parameter. Reverse osmosis can remove many types of dissolved and suspended species from water, including bacteria, and is used in both industrial processes and the production of potable water.
The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.
To be "selective", this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution (such as solvent molecules) to pass freely.
Osmosis is a natural process. When two solutions with different concentrations of a solute are separated by a semipermeable membrane, the solvent has a tendency to move from low to high solute concentrations for chemical potential equilibration.
UV Water Purifier
UV stands for Ultra Violet Rays, these radiations are part of the light. They are specific to a certain wavelength. Ultraviolet rays are used in UV water purifier. UV rays are used for many purposes like in laboratories to test chemicals, in chemical reactions, to study compounds, filter water etc. UV rays are harmful to humans so direct exposure is should be avoided.
These are also used as a technology to disinfect water from various disease-causing germs, viruses, bacteria, protozoa and other micro-organisms.
This is the best method to disinfect bacteria from water. UV purification technology uses ultraviolet Rays to kill microorganisms causing disease. UV rays penetrate DNA of microorganism and change their DNA code so they no longer multiplicate, even they are killed. UV purification technology is simple and environment-friendly.
It does not use any chemical to disinfect microorganisms also don’t add odour and smell to the water.
UV method is 99.9% effective in killing germs and harmful microorganisms from the water. It should be used if water supply might contain E.coli, cryptosporidium, giardia or any other kind of virus or bacteria
UV purification not only kills viruses it also stops their multiplication by changing DNA codes which is very effective compared to chlorination. Adding Chemicals to water is harmful because it creates by-products which are not good for health.
Simple, clean and environment-friendly technique to kill germs and viruses.