Deremeshko L. Environmentally reasonable water treatment from fluoride by baromembrane methods with waste recycling

The thesis contains a complex of researches, the results of which allowed for the first time to determine the main physicochemical dependencies and concentration limits for the effective use of baromembrane processes using known and new types of membranes for purifying natural waters from fluorides in order to obtain high-quality physiologically complete drinking water and the treatment of the formed retentates by electrochemical methods. For the first time installed the high efficiency of water defluorination processes on membranes made of natural materials (wood and clay minerals), developed and manufactured in A.V. Dumansky ICWC of NAS of Ukraine. It was performed scientifically based choice of the most effective low-pressure reverse osmosis membranes (OPAM-KN, ESPA-1, TFC-75F) for the fluorine-containing salty water treatment and established concentration limits of their effective use for the removal of excess fluoride to MAС in drinking water were established. A household installation for the purification of fluorinated Poltava region brackish waters has been developed and proposed. It is proposed to carry out the processing of the formed retentates of reverse osmosis defluorination of natural waters by electrochemical methods: galvano- and electrocoagulation. It was concluded that the combination of baromembrane and electrochemical methods are expedient, which provides the necessary depth of water purification from fluorides and significantly reduces or even completely eliminates secondary pollution of the environment.