What is a reverse osmosis system？

The basic working principle of reverse osmosis is: use a special high-pressure water pump to increase the pressure of raw water to 6-20 kg, so that the raw water can permeate through the reverse osmosis membrane with a pore size of only 0.0001 micron under the action of pressure. Chemical ions, bacteria, fungi, and virus bodies cannot pass through, and are discharged with wastewater, and only water molecules and solvents with a volume smaller than 0.0001 microns are allowed to pass through.

The security filter is equipped with a filter element with a filter aperture of 5 μm. These filter elements will filter out any particle size greater than 5μm. It can protect the downstream RO membrane, otherwise the surface of RO membrane is easy to scale. The more commonly used type of permeable membrane is polyamide membrane, and the membrane type is roll-type composite membrane. The salt removal rate of this type of membrane can reach 99.5%.

Since the RO membrane is easily affected by the pH value of the water, residual chlorine and water temperature, the RO membrane has strict requirements on the quality of the influent water before operation:

PH value: 3~10

Residual chlorine value: <0.1mg/L

SDI15 value: <5.0

Water temperature: <45 ℃

If any of the above indicators exceeds the range, the permeable membrane may be deformed, thereby affecting the quality of effluent water and shortening the service life of the membrane. And different types of membranes have different requirements for influent water quality. Before commissioning, it can be confirmed according to the instructions provided by the RO membrane manufacturer.