Process and device for purifying organically polluted waste water

A process for purifying organically polluted waste water comprising the steps of:

• providing a primary treatment system and a separate secondary system, said primary treatment system including a waste water flowpath, a first heat exchanger in said waste water flowpath, a second heat exchanger downstream of said first heat exchanger, and a means for detecting the level of a waste water sump solution;
• said secondary system including a raw water inlet, an opposite side of said first heat exchanger, an opposite side of said second heat exchanger, means for heating the raw water, and a means for detecting an operational parameter of the secondary system;
• heating the raw water to form raw water vapor;
• evaporating a portion of the waste water primarily by indirect heat exchange with said raw water vapor in the first heat exchanger to form waste water vapor and a waste water sump solution, the level of which varies;
• condensing the waste water vapor and evaporating the raw water during condensation of the waster water vapor in the second heat exchanger;
• detecting the level of the waste water sump solution;
• detecting an operational parameter of the second system;
• admitting waste water to the primary system as a function of the detected level of the waste water sump solution;
• and
• drawing off waste water from the waste water sump solution as a function of the detected operational parameter of the secondary system when the detected value exceeds a set value.