Water purification industry information

Introduction of various indexes of reverse osmosis membrane

Views : 55627
Update time : 2021-09-27 17:47:07
1. Desalination rate and salt permeability of reverse osmosis membrane
reverse osmosis membrane

Salt permeability = product water concentration / influent water concentration × 100%

Desalination rate = (1-salt content of product water / salt content of influent water) × 100%

Salt penetration rate = 100%-desalination rate

The desalination rate of the 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 membrane element. The denser the desalination layer, the higher the desalination rate and the lower the water production.

The desalination rate of different substances by reverse osmosis 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 ions, potassium ions, and chloride ions is slightly lower. , But it also exceeds 98%; the removal rate of organics with a molecular weight greater than 100 can also exceed 98%, but the removal rate of organics with a molecular weight of less than 100 is low.

2. Water production of reverse osmosis membrane
reverse osmosis membrane
Water production-refers to the water production capacity of the reverse osmosis system, that is, the amount of water permeating the membrane per unit time, usually expressed in tons/hour or gallons/day.

Permeation flow rate-is also an important indicator of the water production of reverse osmosis membrane elements. 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 membrane surface to increase, which will aggravate membrane fouling.

3. Recovery rate of reverse osmosis membrane

Recovery rate-refers to the percentage of feed water converted into product water or permeate in the membrane system. Depends on the pretreatment influent water quality and water requirements. The recovery rate of the membrane system has been determined at the time of design,

Recovery rate = (product water flow/influent flow) × 100%

For large RO systems, the recovery rate is usually limited by the tendency of insoluble salt to foul, that is, by the maximum concentration of concentrated water; for small RO systems, the recovery rate is usually less than 30% to 50%. When the recovery rate is low, the RO device can operate safely without controlling the solubility of insoluble salts. Cost is usually not a priority for small RO systems.
Related News
Read More >>
How to make the water purifier filter element more durable? These tips could help you! How to make the water purifier filter element more durable? These tips could help you!
Jul .04.2024
The core function of a household water purifier is to adsorb and filter impurities in the water to further improve the quality of drinking water. The core component of the water purifier is the filter element, which is equivalent to the heart of the human body and plays a vital role in the operation of the water purifier. However, the filter element is not permanently used and is affected by external factors such as poor water quality and high frequency of use. Impact, the service life will be greatly shortened, so how to make the water purifier filter element more durable? Today Susan has compiled some maintenance tips for you to teach you how to better maintain the water purifier filter element and extend its service life!
A water purifier can save tens of thousands of medical expenses. Are you still hesitating? A water purifier can save tens of thousands of medical expenses. Are you still hesitating?
Jul .04.2024
I recently heard a case like this: a man had kidney stones, but for various reasons he did not have medical insurance. At the end of last year, he calculated that the surgery and medicine costs were nearly 30,000 yuan. This was a big burden for him with a low income. While prescribing medicine for him, the doctor at a tertiary hospital solemnly reminded him: "You should pay attention to what kind of water you drink every day. If you have the conditions, buy a water purifier!" It can be seen that his illness is closely related to unclean drinking water.
The after-sales service of the water purifier urges to replace the filter cartridge every year. Is it The after-sales service of the water purifier urges to replace the filter cartridge every year. Is it "dedication" or "deception"? The answer is here
Jul .02.2024
Some time ago, I talked to a friend about water purifiers. My friend always complained that he had to replace the filter cartridge of the water purifier again this year, and more than a thousand yuan was gone again.
There is a problem that everyone must pay attention to, that is, the replacement of the filter cartridge of the water purifier. It can be said that after installing a water purifier at home, there will be problems in this regard every year.
I don’t know if you have encountered this situation: the after-sales service of the water purifier urges to replace the filter cartridge every year. So is it "dedication" or "deception"?
In this article, Susan will share with you the relevant issues of replacing the filter cartridge of the water purifier, and try to avoid pitfalls.
If the filter element is not replaced in time, the water purifier turns into a If the filter element is not replaced in time, the water purifier turns into a "sewage collector"? Don't take it lightly anymore!
Jul .02.2024
Does your home have a water purifier? For many people, this has become a necessary household appliance. But do you know? It is not a decoration, but the last barrier to your healthy drinking water. Don't underestimate it, it can filter out rust, bacteria, viruses, etc. in the water, ensuring the safety of your drinking water and your health.

However, this thing is not done once you use it. Many people turn their water purifier into a "sewage purifier" because they don't pay attention to the time to replace the filter element, or simply forget it.