Reversed osmosis process


The reverse osmosis is a basic process on almost all natural metabolic processes. If we add to a tank the same quantity of two solutions of distinct salt water concentrations, separated by a semipermeable membrane, a natural movement of the liquid will take place (without its salty component) from the less concentrated solution to the more concentrated solution, until the two solutions will have the same concentration. At the end of the process, this liquid movement will generate a difference of level that will produce a pressure difference on the membrane. This difference is called osmotic pressure.

By applying to the concentrated solution a pressure that is higher than the osmotic pressure, the reversed osmosis process occurs, meaning that the water from the more concentrated solution will pass without the salts contained by the semipermeable membrane, into the less concentrated solution, losing its salinity and, thus, becoming pure.

The semipermeable membranes used in the reversed osmosis systems are synthetic, specially designed for this type of equipment.

The major advantage of the water treatment through reversed osmosis is that it removes up to 99% of the organic and anorganic agents dissolved in water, as well as approx. 99% of the biological contaminants (bacteria, viruses), without any negative impact on the environment, the method being based on a physical phenomenon and not on a chemical one.

As a drawback against the classical desalination (distillation, ion exchangers) is the fact that the industrial equipment carry higher cost due to the pre-treatment systems that are absolutely mandatory.

The industrial reversed osmosis plants are standard equipment for desalination of the softened drinkable water, that operates according to the principle of the reversed osmosis phenomena.

These are installed on a stainless steel frame with a front panel made of plastic, that includes measurement and control devices. They include a special input filter with 5 micron filtering cartridge and 2 pressure gauges, a low noise multistage high pressure centrifugal pump, made of stainless steel, modules with membranes in pressurized recipients. These are equipped with cocks, measurement and adjustment devices and with a microprocessor.

Fluids and specific parameters used on reversed osmosis plants:

Inlet water = the water that enters the plant, submitted to reversed osmosis treatment

Permeate = desalted water that passed through the semipermeable membrane and that goes out from the reversed osmosis plant to the consumer

Concentrate = high salt content water, that only runs the membrane at its surface and goes out of the reversed osmosis plant at draining.

Output [%] = (Permeate flow / feed water flow) x 100; max. value allowed in operation = 75%

Desalination degree [%] = it defines the permeate distillation degree against the feed water; approx. 97%.

Industrial reverse osmosis plant- Osmeo range

Result of many years of experience, the Osmeo range of products combines compactness, user friendliness and high treatment performance.

The Osmeo range is designed to supply reverse osmosis water for the following industrial applications:

  • Food-processing industry,
  • Professional laundries
  • Laboratories;
  • Cosmetics,
  • Low pressure boilers
  • Any application requiring RO water.