Evaporation of water at atmospheric pressure is an energy-intensive process and occurs at a temperature of around 100°C, which is above the operating temperatures of many wastewater treatment systems, making it impossible to use and forcing the customer to resort to less efficient and more expensive technologies.


The vacuum evaporators designed by ZEWATECH allow working with a relative pressure of -965 mBar, reducing the boiling temperature of the water present in the boiler to a value close to 32ºC and, consequently, the electrical consumption. Under these conditions it is possible to implement more efficient heat supply systems, which work with temperature ranges between 50ºC and 80ºC.


Vacuum evaporators make it possible to transform a waste industrial effluent into two streams:

  1. A) One corresponding to the fully purified distillate of high quality that can be reused and recirculated in the production process of the desired product of each specific company or used for another purpose, thus completing a circular economy.
  2. B) On the other hand, a concentrated liquid or solid waste is also generated, which significantly reduces the costs of waste management and pre-treatment.   In other applications, this waste is used as a CONCENTRATE for reuse.

This is the most efficient technology for the reduction of water-based liquid industrial waste. This technology from vacuum evaporation is clean, safe and versatile as it adapts to any situation and industry.

A vacuum evaporator is powered by electrical energy or by other external energy sources such as thermal oil, steam, hot water, etc.  Standard ZEWATECH units use heat pump and vapour thermo compression technology to distil waste at a low energy cost.

The reason why the evaporators represent an important technological advance is that by means of the vacuum pumps, a vacuum of 33 mbar is created in the installation and this allows the water in the waste to boil at a temperature of approximately 31ºC. Boiling effluents at this temperature not only allows evaporation at a very low energy cost, but also the condensed and recovered water has high quality properties and in most cases can be reused in many functions.

The product (0) enters the evaporator and is deposited in the boiling chamber (1) where it starts to increase in temperature. At the same time, the vacuum pump (3), as its name indicates, reduces the pressure in the evaporator.

Once the bubble temperature is reached, evaporation begins. The gas particles of the treated effluent travel through the condensation chamber (2) and are extracted by means of an injector (4) in a distillate accumulator (5) which is finally where the desired product is located and the distillate (6) is extracted.

On the other hand, a heat exchanger (7) and a generator (8) are used to keep the internal temperature high and the condensation chamber cooled.

The equipment is controlled at all times by pressure gauges to keep the pressure under control at all times, as this is the most important part of this operation.

At the bottom of the heat exchanger, the concentrate or dry residue is obtained in many cases (9).

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