Abstract: A system and process for concentrating a lithium stream is disclosed. The lithium stream is directed to a reverse osmosis unit which produces a concentrate containing lithium compounds. The RO concentrate is directed through two pressure retarded osmosis (PRO) modules connected in series. The two PRO modules further concentrate the RO concentrate and at the same time yield a diluted brine that is effective to drive an energy recovery device. The RO concentrate leaving the PRO modules is directed to an osmotically assisted reverse osmosis (OARO) module which also further concentrates the RO concentrate.

Abstract: The method and corresponding installation allow seawater to be biologically treated in order to purify it. The use of bioflocculation make it possible to avoid using exogenous coagulation and/or flocculation agents, allows a significant reduction in the clogging power of the water treated, allows an improvement of the yield and a reduction of the quantities of sludge produced to be treated then discharged.

Abstract: The invention pertains to a method for treating water in order to make it drinkable or desalinated, said method comprising at least one cycle for treating said water comprising: a step of coagulation and/or flocculation; a step of flotation, within a flotation reactor (29), of the water coming from said step of coagulation, followed or not followed by a step of flocculation; a step of gravity filtration, within a gravity filter (33), of the water coming from said step of flotation, said flotation reactor (29) being at least partly superimposed on said gravity filter (33), and at least one cycle for washing said gravity filter comprising a step for backwashing said gravity filter, characterized in that said step of gravity filtration is carried out at a speed of 10 m/h to 30 m/h, said gravity filter having a bed of filtering material (330) distributed on a height of 1.5 m to 3.0 m.