Water purification information

Introduction of various indexes of reverse osmosis membrane

Views : 71048
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 >>
Is a water purifier an IQ tax or a health guard? Is a water purifier an IQ tax or a health guard?
Sep .20.2024
In daily life, there has been a constant controversy about water purifiers. Some people say that buying a water purifier is paying an IQ tax, or even that water purifiers are a scam. So, what is the truth? Today, Susan will delve into the truth about water purifiers with you.
If you are planning to buy a water purifier, then please pay attention to these points!!!! If you are planning to buy a water purifier, then please pay attention to these points!!!!
Sep .20.2024
Families, who are planning to buy a water purifier should pay attention! Water purifiers can bring us healthier, safer drinking water, but there are five important considerations that must be understood before you buy one.
Should we install a direct drinking water purifier or not? Should we install a direct drinking water purifier or not?
Sep .19.2024
     At this stage, people's main source of water is tap water, the most direct method of drinking water is a water dispenser, but at present, tap water pollution is very serious, most families have long been installed in the household direct drinking water purifier to provide clean and safe drinking water, but many people are still on the direct drinking water purifier products there are misunderstandings, holding a fluke in the thought of my home in the end do I need to install a water purifier it? In fact, the most professional answer is: there is no need! The health benefits is the biggest demand!
Commercial / Household water purifier (direct water dispenser) fault book Commercial / Household water purifier (direct water dispenser) fault book
Sep .19.2024
The amount of water in the water purifier is small, the water purifier does not produce water, the noise of the water purifier has become louder, the water purifier ....... Susan summarized 25 common fault problems of water purifier for you, hand in hand to teach you how to troubleshoot, so you can easily deal with the water purifier, enjoy good quality water.