Reject water in the reverse osmosis process is the water that is not used during the production of purified water. This water contains a high concentration of salts and other contaminants that have not been retained by the osmosis membranes.


Although reject water is discarded, it can be an environmental issue if not managed properly. Typically, reject water is discharged into rivers, seas, or underground aquifers, which can cause environmental and public health problems.


In summary, reverse osmosis reject water is an environmental and resource management issue that needs to be addressed properly. Treating and reusing reject water can contribute to environmental preservation and the conservation of water resources.



Undoubtedly, reverse osmosis plays a crucial role in the industry to obtain purer water than what arrives at our factories. However, are we overlooking an important factor? The often-forgotten element that takes center stage in this equation is the reject water.

In times of drought, which can be relentless in some areas of the planet, it’s accepted to discard reject water, which still contains over 95% water, as unsuitable for use and discharge it beyond established discharge limits.

A complete mass balance demonstrates that while reverse osmosis provides us with high-quality water, to obtain one liter of osmotized water, it may require consuming up to 3 liters at home, around 2 liters in small industrial plants, and 1.5 liters in larger industrial plants.

While it is true that in recent years, membranes have been developed that allow operation at very high pressures (approximately 80-90 bars) and produce a reject of only 10-15%, this reject is still primarily water, an essential raw material for life that is expected to be scarce in the not-so-distant future.



With the use of ZEWATECH evaporators, water consumption is significantly reduced as they do not require additional water input. Furthermore, they enable the recovery and reuse of both waste and water, thanks to their purity after proper treatment.

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