In a liquid treatment system with an inlet and an outlet defining a liquid flow direction from the inlet to the outlet, a liquid treatment zone arranged between the inlet and the outlet, the liquid treatment zone comprising a number of ultraviolet radiators arranged to radiate ultraviolet radiation into a liquid flowing through the treatment zone, a first transition zone downstream of the inlet and a second transition zone upstream of the outlet, which adapt the cross section of the inlet to the cross section of the treatment zone, and the cross section of the treatment zone to the cross section of the outlet, respectively, wherein the inlet, the transition zones, the treatment zone and the outlet confine the liquid flow in a closed channel, greater durability of the radiators and the channel wall material is achieved by providing a degassing between the inlet and the treatment zone at the top of the channel.
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