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The yield of a reverse osmosis system

Jan 31, 2024, 14:50:10

Synthetic membranes are used in water treatment systems that work on the principle of reverse osmosis. These membranes are permeable to water molecules. The ingredients dissolved in the water are retained by the membranes. The concentrated solution (e.g. drinking water or process water) flows over this membrane at high pressure. This results in the separation of this solution into a partial stream with water in which the retained ingredient (concentrate) is located.

What does the yield mean?

The yield indicates the ratio of permeate to raw water. For example, a yield of 80% means that 80 liters of permeate can be produced from 100 liters of raw water. The higher the yield, the less wastewater (concentrate) the system produces.

calculation equations_reverse osmosis.PNG

Temperature dependence of the permeate performance

The permeate output of a reverse osmosis system depends on the feed water temperature. The nominal power specified in the technical data and on the nameplate always refers to an additionally specified design temperature. The actual performance at a specific feed water temperature must be calculated using a correction factor from the following table. The respective temperature-related permeate output is calculated according to the following calculation equation:

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Product: REOS Compact Umkehrosmoseanlage

Answer:

The REOS Compact reverse osmosis system is primarily designed for the treatment of relatively clean, pre-filtered drinking water. While it is excellent at removing impurities, pollutants and microorganisms from water to produce pure drinking water, its suitability for producing drinking water directly from a body of water such as a river depends on various factors.

For the direct treatment of river water into drinking water, preparatory steps are usually necessary to remove coarse impurities and particles before the water is passed through a reverse osmosis system. This includes pre-filtration to remove sediment, suspended solids and possible larger organic materials that could damage or clog the reverse osmosis system membranes.

Furthermore, the process of reverse osmosis can also lead to a reduced pH value, making the water slightly acidic. This is because reverse osmosis systems not only remove impurities, but also minerals that give the water flavor and contribute to pH balance. In some cases, it is therefore necessary to post-treat the osmosis-treated water to increase the pH and add minerals back in so that it meets drinking water standards and preferences.