Pumps For Reverse Osmosis

All over the world, there is the need to have mixtures separated into parts. Luckily, scientists and engineers have a vast array of methods at their disposal.

When it comes to separating solutes from their solvents, the method commonly used is reverse osmosis. Here, the mixture, often a liquid, is made to pass through a semipermeable membrane with pores large enough for small molecules yet small enough to block larger particles. Effectively, the membrane becomes a filter, separating the components of the mixture.

However, this phenomenon does not occur naturally.

Take, for instance, two jars that are connected by a pipe. A semipermeable membrane is found somewhere in the middle of this apparatus. You then fetch two solutions made of the same components, with one having a higher concentration of solute than the other.

If you pour these solutions into the different jars, you'll notice that the solutions will keep on flowing between the semipermeable membrane until the whole system has a uniform concentration of solutes and solvents. This phenomenon is called osmosis, the opposite of reverse osmosis.

When two solutions are brought into contact with each other, the solvents will flow into the space where there is a high concentration of solutes due to what is called osmotic pressure. If this pressure isn't counteracted, mixtures brought together in the manner described above will undergo the process of osmosis.

Extra energy and extra pressure has to be introduced into the system to push against osmotic pressure. Pumps are really handy for such a task. In fact, different pumps would bring in the energy through different ways.

Some bring in mechanical energy and just push the liquid along the piping system. Examples of these pumps are watermills and those that use cork-screw apparatuses. Others compress a certain amount of a liquid into a small pipe, quickly releasing the cooped up energy.

Pumps are crucial to any process utilizing reverse osmosis. Without them, the entire process wouldn't even begin.