What is the amount of RO reverse osmosis membrane?
January 08, 2024
RO reverse osmosis membrane is more and more extensive in the field of water treatment, RO reverse osmosis membrane flux as an important indicator of reverse osmosis membrane, many users do not know much about RO reverse osmosis membrane flux, today follow our company's technical personnel to understand.
What does "flux" mean?
In popular terms, RO membrane flux refers to the water production, that is, the water filtered through the reverse osmosis membrane in a certain period of time, that is, the reverse osmosis membrane water production in a certain period of time. Membrane flux is usually measured in units per hour, the unit is: L/ (m².h), referred to as LMH, refers to the number of liters of liquid passed per square meter per hour.
In general, a high-quality RO reverse osmosis membrane should have the following properties:
① Large water permeability per unit area, high desalination rate;
(2) The mechanical strength is good, and the compaction effect of the porous support layer is small;
③ Has good chemical stability, acid and alkali corrosion resistance and microbial erosion;
④ Uniform structure, long service life, slow performance attenuation;
The film is easy to make, the price is cheap and the raw materials are sufficient.
2. What is the RO reverse osmosis membrane flux?
In general, a 40-inch long film produces 0.0625m³/H of water per 1 inch diameter. That is, if it is 40 inches long and 4 inches in diameter, it produces 0.25 tons of water per hour (the common 4040 membrane). 40 inches long, 8 inches in diameter, it produces 1 ton of water per hour (the common 8040 membrane). However, the value also depends on his desalination rate and temperature, the same brand, the same size of the film, the high desalination rate than the low desalination rate, the water production is slightly smaller.
3. Factors affecting the flux of RO reverse osmosis membrane
The water flux of RO reverse osmosis membrane is an important operating parameter in the reverse osmosis process, and the membrane flux will be affected by many aspects.
Such as inlet pressure, inlet temperature, inlet PH, inlet salt concentration, recovery rate and other factors.
However, we should pay more attention to the temperature, the lower the temperature, the lower the membrane flux (water production), the temperature is below 25 ° C, and the membrane flux decreases by 3% for every 1 ° C drop in temperature. Temperature has the greatest influence on operating pressure, desalting rate and pressure drop of reverse osmosis membrane. As the temperature rises, the permeability improves and the net driving force required at a given water flux is reduced, so the actual operating pressure is reduced. At the same time, the solute transmission rate also increases with the increase of temperature, and the salt transmission amount increases, which is directly reflected in the increase of the product water conductivity.
The membrane flux of RO reverse osmosis membrane is one of the most important data of all, so we will pay more attention to it when purchasing. And we will find that in fact, the membrane flux is reflected in the product manual, is a reference value set by the manufacturer, in fact, we have to choose according to the comprehensive analysis of inlet water quality and water treatment system. Therefore, it is recommended that we test and analyze the water quality before purchase and select the type.
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