A system for the purification of effluents by evaporation at low temperature with condensation heat recovery is presented. Low temperature evaporation requires low pressure in the evaporation-condensation chamber. To obtain the necessary low pressure conditions described above, a vacuum generator with low energy requirements has been designed. A vacuum generation process is required until the vapour pressure corresponding to the temperature of the effluent is reached in the evaporator, which has risen through the evaporator until it reaches a height that balances the pressure in the raw water feed container. Under these conditions it is necessary to provide the necessary heat to maintain the evaporation process. Heat recovery allows the process to be almost autonomous from the energy point of view, with only the heat transferred to the environment as losses being necessary to contribute to the system. The water vapour occupies a serpentine pipe immersed in a container through which the effluent contained in the raw water feed container is circulated, so that the water vapour condenses and transfers the condensation heat to the preheating effluent . The condensed water falls through the pipe to the tank that accumulates the purified water.

Goals:

• Reduce the contaminant levels of the liquids generated to those legally admissible for discharge into public watercourses in an economically viable way.
• Carry out distillation at low temperature which would enable the use of residual heat from industrial processes and/or solar energy.
• Recover part of the latent heat of vaporisation that is provided to the effluent once the distillate is condensed. In this way, most of the energy supplied is reincorporated into the process.