A device for discharging a jet of fluid, comprising: a tubular body extending between its own air inlet and its own air outlet; blowing means operatively associated with the tubular body for generating a flow of air along a direction of propagation of the air from the inlet opening to the outlet opening; a first group of nozzles operatively associated with the tubular body for spraying a first fluid towards the flow of air; a second group of nozzles operatively associated with the tubular body for spraying a second fluid towards the flow of air; a first conduit for conveying the first fluid extending from a relative inlet portion for the first fluid to a relative outlet portion connected to the first group of nozzles for carrying the first fluid to the first group of nozzles; a second conduit for conveying the second fluid separated from the first conduit and extending from a relative inlet portion for the second fluid to a relative outlet portion connected to the second group of nozzles for carrying the second fluid to the second group of nozzles; valve means interposed between the inlet portion and the outlet portion of each conduit and configured to select the discharging of the first fluid from the first group of nozzles or the second fluid from the second group of nozzles in such a way as to configure the device, respectively, in a first operating mode or in a second operating mode; the inlet portion of each conduit being connectable to a source of liquid; characterised in that, it comprises at least two containment tanks each designed to contain a respective solution different from the solution contained in the other tank and selected amongst an odour reducing solution, a dust reducing solution and a flame mitigating solution; each tank being connected to a respective conduit at the inlet portion in such a way as to mix the relative solution with the liquid to form the first fluid or the second fluid. a tubular body extending between its own air inlet and its own air outlet; blowing means operatively associated with the tubular body for generating a flow of air along a direction of propagation of the air from the inlet opening to the outlet opening; a first group of nozzles operatively associated with the tubular body for spraying a first fluid towards the flow of air; a second group of nozzles operatively associated with the tubular body for spraying a second fluid towards the flow of air; a first conduit for conveying the first fluid extending from a relative inlet portion for the first fluid to a relative outlet portion connected to the first group of nozzles for carrying the first fluid to the first group of nozzles; a second conduit for conveying the second fluid separated from the first conduit and extending from a relative inlet portion for the second fluid to a relative outlet portion connected to the second group of nozzles for carrying the second fluid to the second group of nozzles; valve means interposed between the inlet portion and the outlet portion of each conduit and configured to select the discharging of the first fluid from the first group of nozzles or the second fluid from the second group of nozzles in such a way as to configure the device, respectively, in a first operating mode or in a second operating mode; the inlet portion of each conduit being connectable to a source of liquid; characterised in that, it comprises at least two containment tanks each designed to contain a respective solution different from the solution contained in the other tank and selected amongst an odour reducing solution, a dust reducing solution and a flame mitigating solution; each tank being connected to a respective conduit at the inlet portion in such a way as to mix the relative solution with the liquid to form the first fluid or the second fluid.