A beverage dispenser comprising a liquid supply line (2) fluidly connected to a water source (3), a gas supply line (4) fluidly connected to a carbon dioxide pressurized source (5), at least one mixing pump (6) for carbonating the liquid, a dispenser point (8) for dispensing the carbonated liquid, the mixing pump (6) comprises a chamber (7) for receiving the liquid and the gas, at least one liquid inlet port (15) and at least one gas inlet port (16) for supplying separately the liquid and the gas into the chamber (7), intermeshing rotors (17,18) rotatably mounted inside the chamber (7) for mixing the liquid and the gas, and at least one outlet port (19) for delivering the liquid/gas mixture to the dispenser point (8).
