TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: In recovering ammonia, a concentrated solution of sodium hydroxide, calcium hydroxide or potassium hydroxide is fed into the turbo-stripper, in such an amount as to bring the pH of the waste flow to a value of between 10 and 13, preferably about 12. The residence time of the waste flow in the turbo-stripper is comprised between 30 seconds and 5 minutes, and preferably is about 2 minutes. The internal pressure of the turbo-stripper is at a value comprised between 0.05 and 1 atm, and preferably is about 0.9 atm. The process further comprises feeding the ammonia rich gaseous flow and a flow comprising sulfuric acid or nitric acid into a first ammonia usage unit, and reacting the flows, thus obtaining ammonium sulfate or ammonium nitrate based salts; and feeding the ammonia rich gaseous flow and a fuel into a second ammonia usage unit comprising a burner, and reacting the ammonia contained in the ammonia rich gaseous flow with the nitrogen oxides generated by the combustion of the fuel. Ammonia rich gaseous flow is pre-mixed with the fuel before the combustion. The fuel comprises biogas or biomass. The process also comprises feeding the ammonia rich gaseous flow and an oxidizing flow into a third ammonia usage unit comprising a endothermic Otto engine, and reacting the flows react to feed the engine. The waste flow is a municipal solid waste landfill leachate or a waste flow originated from digestate obtained by biomass anaerobic fermentation or any other liquid waste flow containing ammonia. The waste flow is obtained by a liquid/solid separation step of the digestate. Fuel fed into the second ammonia usage unit is a biogas flow obtained by the biomass anaerobic fermentation step. Preferred Plant: In the plant, the liquid/gas separation unit consists of a hydrocyclone. The plant further comprises at least one ammonia usage unit downstream of the liquid/gas separation unit and in fluid communication, at least one ammonia usage unit comprises a Venturi scrubber, a turbo-scrubber, a boiler equipped with a burner or an endothermic Otto engine. Two or more ammonia usage units are disposed in series. The plant also comprises a liquid/solid separation unit upstream of the turbo-stripper and in unidirectional fluid communication. The liquid/solid separation unit comprises a centrifuge or a filtration system. The plant further comprises a digester upstream of the liquid/solid separation unit and in fluid communication with the liquid/solid separation unit and with at least one ammonia usage unit comprising a boiler equipped with a burner. EXAMPLE - No example given.