The use of any technological solutions in water treatment is accompanied by the formation of sludge and concentrated salty wastewater. The discharge of these effluents into the environment is difficult, and most often impossible. In the complex solution of water treatment problems with the exception of wastewater discharge, thickening and dehydration of sludge, reagent treatment in conjunction with reverse osmosis concentration of saline effluents, evaporation under vacuum and drying of saturated concentrated salt solutions are used. As a result of this technological process, dehydrated sludge (cake), dissolved mineral impurities and demineralized water (permeate and evaporation condensate) are separated from the wastewater. In most cases, the bulk of the soluble salts formed during evaporation are sulfate and sodium chloride. The permeate of the reverse osmosis plant and the condensate of the evaporation plant are returned to the main technological process of the enterprise.

Reagent treatment of wastewater before evaporation is due to high requirements for the concentration of calcium, silicic acid and a number of other impurities entering the reverse osmosis and evaporation plants.

When designing and manufacturing installations for this technological solution, it must be taken into account that the initial salt concentration is 30-40 g/l, which means that the first stage of wastewater treatment is the stage of “marine” reverse osmosis. Both at this stage and further along the technological chain, due to the high pressure in reverse osmosis systems (up to 60-70 bar), the high corrosivity of these effluents, special attention is paid to the choice of materials. Based on these considerations, taking into account the world practice of designing marine reverse osmosis systems, marine reverse osmosis units are manufactured from duplex and superduplex steels or austenitic steels with a molybdenum content of at least 6%. Evaporators with dryers are also made of special steels using composite materials.

We offer modern solutions for the reconstruction of existing water treatment plants for energy throughout Ukraine, for example, in such cities as Kyiv, Dnipro, Lviv, Odessa, Zaporozhye, etc. as well as for newly built facilities. The existing experience of working with energy enterprises allows us to successfully implement reconstruction projects in the conditions of a working enterprise with virtually no interruption of the water treatment process. In our solutions, we use membrane technologies and modern countercurrent ion exchange schemes using the “clamped layers” technology.