What does RO mean in water purifier?

When it comes to the topic of water purification, I think a lot of people have heard of a relatively unfamiliar word, RO reverse osmosis, which generally refers to terminal water purifiers.The water that comes out of an RO reverse osmosis purifier can be consumed directly and is very clean. Filter out harmful substances in the water and retain beneficial minerals. Drinking this kind of water for a long time is very helpful to our health.

Why is it called "reverse osmosis" filtration?

When the same volume of dilute solution (e.g. fresh water) and concentrated solution (e.g. salt water) are placed on both sides of a semi-permeable membrane, the solvent in the dilute solution will naturally pass through the semi-permeable membrane and spontaneously flow to the side of the concentrated solution. This phenomenon is called osmosis.

When osmosis reaches equilibrium, the liquid level on the concentrated solution side will be a certain height higher than the dilute solution, creating a pressure difference called osmotic pressure. If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow in the opposite direction and start flowing from the concentrated solution to the dilute solution side. Solution. This process is called reverse osmosis.

In short, it is the process of applying pressure to the concentrated solution by energising it to change the original direction of osmosis and achieve the reverse flow of the concentrated solution, thus purifying the concentrated solution and producing pure water.

Why does it produce wastewater?

The working process of the reverse osmosis membrane, the core component of the water purifier, is actually a process of liquid concentration. As water passes through the surface of the reverse osmosis membrane, the salt content of the water increases and the osmotic pressure of the water increases. When the osmotic pressure increases to the pressure of the booster pump, the water cannot flow through the reverse osmosis membrane into the purified water end. This portion of the water that does not pass through is the wastewater produced in the water production process.