Flow-through electrochemical modular reactor (FEM-3 module) – is meant for electrochemical unipolar treatment of fresh or low-mineralized water with the purpose of determined changing of its chemical composition by the synthesis of stable and meta-stable products of anodic or cathodic electrochemical reactions, directed alteration of dissolved gases' composition, catalytic activity in different physical and chemical reactions, primarily sensitive to oxidation-reduction and acid-base medium properties. FEM-3 flow-through diaphragm modular electrochemical cells can be used both as independent electrochemical devices (FEM-3 reactor), and as units of higher capacity called RPE-03 reactors. In RPE-03 reactors, FEM-3 modules can be hydraulically connected in parallel or consecutively. There is an option of mixed hydraulic connection of FEM-3 modules in one reactor, namely, consecutive-parallel.
Similarly, FEM-3 modules in an RPE-03 reactor can be electrically connected. Electric connection in parallel of FEM-3 modules actually makes the reactor a mono-polar electrolyzer, which can be used for electrochemical treatment of solutions with very low electric conductivity. Electrically consecutive connection of FEM-3 modules in an RPE-03 reactor converts it into a bio-polar electrolyzer having no analogues in the world, since it consists of individual separate cells – FEM-3 modules. Such connection layout is advisable for electrochemical treatment of solutions or water with mineralization level over 3-4 g/l.
The main distinctive feature of FEM modules is the combination in one device of properties of ideal longitudinal displacement reactor and ideal transverse mixing reactor as well as possibility of operation under diaphragm differential pressure up to 1.5 kgf/cm 2 at a very low rate of filtration transfer. This permits in conditions of minimal electric power consumption to achieve maximum possible degree of water (solution) meta-stability, which is determined by the difference of values of any physical or chemical parameter at the beginning or at the end of relaxation period.
Another distinctive feature of FEM-3 modules is their high performance indicators in the process of operation with desalinated and fresh water, as well as with low-mineralized solutions (up to 0.1 mol/l).
The only one manufacturer in the world of FEM-3 modules is the Russian enterprise ООО “Laboratory of Electrotechnology” founded by the patent authors V.M. Bakhir and Yu.G. Zadorozhny. They are made in various modifications securing the most optimal parameters of electrochemical exposure in relation to different technological processes and electrochemical systems. The main differences between FEM-3 module modifications are the type of anodic electrode coating of the central electrode, and ceramic diaphragm properties.