Summary

Continental water pollution by heavy metal ions is one of the most common problems 
actually fond in the environment. Some examples can be shown to stand out natural
disasters derived from human slightly responsible actions, such as those happened in the
basin of Guadiamar River and Doņana's National Park (Seville) provoked by poured wastes 
from Boliden Company, or also mining pollution in Rio Tinto (Huelva).

The historical need of industrial wastes vaporization must also be consiered. Industrial 
wastes have tradiotionally been rejected without considering their reutilization. Water 
polluted by heavy metals iones can be found among those wastes and even residual heat 
flows from anyindustrial process can be found too. Residual heat flows can be used as a 
heat sorurce as well as water polluted by heavy metals ions, that has traditionally generated 
problems becuse of its rejection, can be used as row materials in some industrial 
processes. Thus, the environmental is freed from one of itsmain pollutants and the
companies save the treatment costs.

The use of residualheat flows as a heat source to water decontamination can be considered 
as a potentially feasible option for their valorization, specially if they come from boilers or 
any other industrial thermal process. The  utilization of residual heat flows is not only a new 
dimension in industrial economic save possibilities but also an important improvement in
the environmental problems solutions derived from the rejection of metal ions poluted 
water into the envirenment.

Finally, an investigation line appears, that triers to achieve the decntmination of this kind 
of water with reasonable costs by means of technically feasible procedures, using 
evaporative technologies to get the best advantages for the natural environment.