Current use of ion exchange unit process in water treatment for food industry is mainly for boiler feed water softening. However, potentials of ion exchange in water treatment process are of greater significance, which is exactly the matter researched in this paper. After a short review of ion exchange unit process basics, and ion exchangers as an equipment (in scope of that, a suggestions for investitor about techno-econommic analysis of offered solutions for ion exchanger line design is given, in order to minimize errors in plan and design, which might be harmful for investitor), options of using ion exchange in some phases of water treatment process for food industry are discussed, like removing of: mineral matter (softening, decarbonization, demineralization), natural organic matter, and some other constituents (nitrate, ammonia, heavy metals).

Popovo polje covers an area of about 4,000 ha of soil and is situated in the region of Herzegovina karst (Yugoslavia) with favourable climate conditions. Like most of the karst terrains it is part of the karst depression, later filled in the course of alluvial-colluvial processes. After the construction of the water-power plant there appeared positive changes of the natural hydrologic regime. This paper also presents the course and the nature of these changes as well as the results of the transformations in agriculture in the observed region.