The invention relates to a liquid purification assembly using ultraviolet light irradiation against reproduction of pathogenic microorganisms, comprising an irradiation chamber (200) having an internal volume and comprising an inlet (204) and an outlet (205), the irradiation chamber (200) being provided with ultraviolet light emitting means (208) configured to irradiate liquid in the irradiation chamber (200) with ultraviolet light. The irradiation chamber (200) comprises a mechanism configured to cause a change in the internal volume of the irradiation chamber (200), said change in internal volume drawing liquid into the irradiation chamber (200) when the volume of the irradiation chamber (200) increases, and forcing liquid out of the irradiation chamber (200) when the volume of the irradiation chamber (200) decreases. The invention also relates to a beverage dispenser and to a method for purifying a liquid.

An apparatus for purifying liquid comprises a substantially tubular irradiation chamber (100) and a plurality of UV-LEDs (110) projecting ultraviolet radiation into it so as to irradiate the flow (106) of liquid being passed through it, where each of the UV-LEDs (110) is disposed upon the irradiation chamber (100) so that it is illuminated by at least one other of the plurality of UV-LEDs (110).

An apparatus (100) for purifying liquid comprises an irradiation chamber (102) upon which are disposed a plurality of UV-LEDs (112) which irradiate a flow (110) of liquid as it passes therethrough; a coolant conduit (104) is disposed about said irradiation chamber (102) and UV-LEDs (112), which conducts a flow (126) of a coolant fluid through it thereby cooling the flow (110) of liquid and the plurality of UV-LEDs (112).

A system for processing a liquid or semi-liquid food product is provided. The food product is a composition of a first sub-composition having a low concentration, such as water or a sugar solution, and a second sub-composition having a high concentration, such as a concentrate. The high concentration is greater than the low concentration. The system comprises an ultra violet (UV) light treatment apparatus for reducing an amount of microorganisms in the first sub-composition and a blending apparatus for aseptically combining the first sub-composition and the second sub-composition into the liquid or semi-liquid food product.

A substance is treated using a device having: (a) a volute or cyclone head, (b) a throat connected to the volute or cyclone head, (c) a parabolic reflector connected to the throat, (d) a first wave energy source comprising a first electrode within the volute or cyclone head that extends through the outlet into the opening of the throat along the central axis, and a second electrode extending into the parabolic reflector and spaced apart and axially aligned with first electrode, and (e) a second wave energy source disposed inside the throat, embedded within the throat or disposed around the throat. The substance is directed to the inlet of the volute or cyclone head and irradiated with one or more wave energies produced by the first and second wave energy sources as the substance passes through the device.