A vacuum evaporator is a technology which often allows water to be recycled in closed circuit. Moreover, it is a technique that requires little space and limited manual monitoring.
The waste water is evaporated in the evaporator and the vapor which is thus formed, will be condensed back. The liquid that is obtained after condensation will only contain a small amount of polluting substances as they have a higher boiling point than water.
There are two types of evaporators: high and low temperature evaporators. High temperature evaporators operate at a temperature of approximately 85°C. It is a relatively simple technology. The electrical consumption is approximately 60 to 70 Wh per liter of water. Such a system is not applicable if the water contains a large amount of volatile substances, as these are likely to vaporize at a temperature under 85°C. This means that they will be discharged together with the condensed water.
A low temperature evaporator is a more complex system. It operates at a temperature of approximately 30°C. This technology has a slightly higher energy consumption, but is more suitable for the treatment of liquids with volatile components.
When selecting an evaporator, the fluorine and chloride concentration in the liquid to be treated are very important. The material (stainless steel) of the evaporator should be selected based on these values.
In many cases, an evaporator provides a recovery of 90 to 95% of the influent.
PCA can help you with this technology, both in design and construction of the installation.