Water purification information

What is reverse osmosis membrane

Views : 84793
Update time : 2021-10-15 16:29:06
Reverse osmosis membrane is an artificial semi-permeable membrane with certain characteristics made by simulating biological semi-permeable membrane, and it is the core component of reverse osmosis technology. The principle of reverse osmosis technology is that under the action of higher than the osmotic pressure of the solution, other substances cannot pass through the semi-permeable membrane and these substances and moisture are removed. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, and organic matter in the water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process and easy operation.
Customers often ask what performance indicators we need to consider when we choose reverse osmosis RO membranes. Usually divided into three: desalination rate, water production, recovery rate.
1. Desalination rate and salt permeability of RO reverse osmosis membrane
The desalination rate of the RO reverse osmosis membrane element is determined when it is manufactured and formed. The desalination rate depends on the density of the ultra-thin desalination layer on the surface of the reverse osmosis RO membrane element. The denser the desalination layer, the higher the desalination rate and the greater the water production. Low. The desalination rate of different substances of reverse osmosis membrane is mainly determined by the structure and molecular weight of the substance. The desalination rate of high-valent ions and complex monovalent ions can exceed 99%, and the desalination rate of monovalent ions such as sodium, potassium, and chloride is slightly Low, but it can also exceed 98% (the longer the reverse osmosis membrane is used, the more the number of chemical cleanings, the lower the salt rejection rate of the reverse osmosis membrane). The removal rate of organic matter with a molecular weight greater than 100 can also exceed 98%. The removal rate of organic matter with molecular weight less than 100 is low.
Calculation method of salt rejection and salt permeability of reverse osmosis membrane:
Salt permeability of RO membrane = RO membrane product water concentration / influent water concentration × 100%
RO membrane desalination rate = (1-RO membrane water salt content / influent salt content) × 100%
Salt penetration rate of RO membrane = 100%-desalination rate
2. Water production and permeate flow rate of RO reverse osmosis membrane
RO membrane water production-refers to the water production capacity of the reverse osmosis system, that is, the amount of water passing through the RO membrane per unit time, usually expressed in tons/hour or gallons/day.
The permeate flow rate of the RO membrane is also an important indicator of the water production of the reverse osmosis membrane element. Refers to the flow rate of permeate per unit membrane area, usually expressed in gallons per square foot per day (GFD). Too high permeate flow rate will cause the water velocity perpendicular to the surface of the RO membrane to increase, which will aggravate membrane fouling.
3. Recovery rate of RO reverse osmosis membrane
The recovery rate of RO membrane-refers to the percentage of feed water converted into product water or permeate in the reverse osmosis membrane system. Depends on the pretreatment influent water quality and water requirements in the reverse osmosis system. The recovery rate of the RO membrane system has been determined at the time of design.
(1) Recovery rate of RO membrane = (Production water flow rate of RO membrane/Inlet water flow rate) × 100%
(2) The calculation formulas for the recovery rate, salt permeability and desalination rate of reverse osmosis (nanofiltration) membrane modules are as follows:
Recovery rate of reverse osmosis membrane module = RO membrane module water production/intake water×100%
Salt permeability of reverse osmosis membrane module = RO membrane module product water concentration/influent water concentration × 100%
Related News
Read More >>
Application of water purifier in public places: guarding every drop of healthy water source Application of water purifier in public places: guarding every drop of healthy water source
Sep .14.2024
In today's society, with people's pursuit of a healthy life and increasing concern for environmental quality, water purifiers, as an effective water treatment equipment, is gradually playing an increasingly important role in public places. Schools, hospitals, offices and other public places, due to the high flow of people, high demand for water, water quality requirements are more stringent. Therefore, the application of water purifiers in these places is particularly important.
Reverse osmosis ultrapure water system how to maintain can improve life expectancy Reverse osmosis ultrapure water system how to maintain can improve life expectancy
Sep .14.2024
In recent years, people's requirements for water quality is more and more high, in order to meet people's needs, reverse osmosis ultrapure water system is therefore born, and meet the public recognition. In order to protect the performance and stability of reverse osmosis membrane treatment, and the need to do a good job of maintenance, equipment maintenance in order to water quality in order to be more stable, so we have organized the following several maintenance methods, please come to understand.
Why should you install a water purifier? This article will make you understand the importance of the existence of water filters! Why should you install a water purifier? This article will make you understand the importance of the existence of water filters!
Sep .13.2024
The emergence of water purifiers, so that the way of drinking water redefined, the emergence of water purifiers is because the water quality continues to change and the emergence of a way of drinking water; from the ability to drink the river water well water to the tap water to the bucket of water, to the current exceptionally hot water purifier market, is the environment affects the way of drinking water change rather than artificial to speak of this market hype up; like cell phones, because people really need, so the market is Will be hot, if put into a few years ago, the cell phone market is also the need for everyone to introduce.
Will water purifiers replace the bottled water? Will water purifiers replace the bottled water?
Sep .13.2024
We all know that in developed countries, water treatment technology is very advanced, the street just twist open a faucet can be directly drinking water, very convenient. Comparison of China, in recent years, with the industrial development, groundwater pollution is more serious, the residents of the daily drinking water can only be bottled water or water purifier-based. In these two competing ways of drinking water, household water purifiers will further replace the bottled water market?

In this regard, Susan will analyze for you. In the current drinking water environment, is still dominated by bottled water, although the water purifier will to a certain extent impact the bottled water market, but want to completely beyond is very difficult to realize, this is because bottled water has a variety of water purifier does not have the advantage.