Formation and reverse osmosis removal of bromate ions during ozonation of groundwater in coastal areasFormation and reverse osmosis removal of bromate ions during ozonation of groundwater in coastal areas Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-182007enThe generation of bromate ions during ozonation of groundwater samples affected by seawater intrusion was investigated. The ozone‐water contact times studied were 2.5, 5, 10, 15, and 30 min, while the applied ozone rate was 4.5 mg/min. Generation of bromate ions started right after the application of ozone. The level of bromates increased with time as more ozone was added to the reactor. Even after 30 min of ozonation, the concentration of bromates kept rising without reaching a plateau. The higher the initial concentration of bromide ions, the higher the level of bromate ions in the ozonated water sample. The experimental results obtained during ozonation of the specific groundwater samples (low TOC and low ammonia concentrations) were used in order to develop a mathematical model capable of forecasting the generation of bromate ions. The empirical model containing two independent variables, conductivity and contact time, was:his model allows the prediction of bromate ion generation, when the groundwater conductivity and the contact time are known, for an ozone application rate around 4.5 mg/min. Finally, the ozonated water was treated by reverse osmosis. The removal of bromate ions reached 96.1%. Equivalent reduction in the conductivity of the water was also achieved.http://creativecommons.org/licenses/by/4.0/Separation Science and Technology4271465-1476 Gyparakis S. Diamantopoulos Evaggelos Διαμαντοπουλος Ευαγγελος Taylor & Francis Reverse osmosis process (Water purification) water purification reverse osmosis process reverse osmosis process water purification