Introduction: The reverse osmosis membrane is the key component to complete the RO reverse osmosis. It is an artificial semi-permeable membrane with certain characteristics made of a simulated microbial semi-permeable membrane. The material of the reverse osmosis membrane is usually made of fiber material. For example, cellulose acetate film, aromatic polyhydrazide film, aromatic polyamide film. The diameter of the reverse osmosis membrane is very small, which can reasonably remove acid salts, colloidal solutions, microorganisms, organic compounds, etc. in the water. The system software has the advantages of good water quality, low energy consumption, zero pollution, simple processing technology, and simple actual operation.

Generally divided into three categories: desalination rate, water production, recovery rate.

1. Desalination rate and salt permeability of membrane for ro water purifier
The desalination rate of reverse osmosis element membrane has been clarified during its production and molding process. The level of desalination rate lies in the relative density of the fine desalination layer on the surface of reverse osmosis element membrane. The higher the desalination layer, the higher the desalination ratio, and the lower the water production. . The desalination rate of membrane for ro water purifier for different chemical substances is mainly determined by the structure and content of the chemical substances. The desalination rate of high-priced positive ions and complex cations can exceed 99%. Price positive ions such as potassium ions, calcium ions, and chloride ions The salt rejection rate is slightly lower, but it can also exceed 98% (the longer the reverse osmosis membrane is used, the higher the frequency of chemical water treatment, and the lower the salt rejection rate of the reverse osmosis membrane). The adsorption rate of organic compound resins with a content of more than 100 can also reach 98%, but the adsorption rate of organic compound resins with a content of less than 100 is low.
Attachment: Calculation method of salt rejection rate and salt permeability of reverse osmosis membrane
Salt passing rate of reverse osmosis membrane = reverse osmosis membrane product water concentration value / osmotic concentration value × 100%
RO membrane desalination rate = (1-RO membrane water salinity / water seepage salinity) × 100%

The salt permeability of the reverse osmosis membrane = 100%-the salt rejection rate.

2. Water production and permeability of membrane for ro water purifier.

The water production volume of ro water filter membrane refers to the water production capacity of the RO reverse osmosis system software, that is, the water flow through the RO membrane per unit time, usually expressed in tons/hour or gallons/day.
The permeability of ro reverse osmosis membrane is also a key indicator of the water produced by reverse osmosis membrane elements. Refers to the flow rate of liquid through the total membrane area, generally expressed in gallons per square meter (GFD). Too high permeability will accelerate the vertical separation of the water flow on the surface of the RO membrane, and aggravate the membrane environmental pollution.

3. Recovery rate of membrane for ro water purifier.

Recovery rate of ro water filter membrane refers to the percentage of water supply and drainage in the reverse osmosis membrane system software that is converted into product water or liquid. According to the pre-processed seepage water body and tap water regulations in the RO reverse osmosis system software. The recovery rate of the RO membrane system software has been clarified in the design scheme.
(1) Recovery rate of reverse osmosis membrane = (total water flow of reverse osmosis membrane/inlet and outlet water) × 100%
(2) The calculation methods for the recovery rate, salt permeability and desalination rate of RO reverse osmosis (nanofiltration membrane) membrane modules are as follows:
Recovery rate of reverse osmosis membrane parts = water production volume of reverse osmosis membrane parts / water inflow × 100%

Salt permeability of reverse osmosis membrane parts = product water concentration value of reverse osmosis membrane parts / osmotic concentration value × 100%