Abstract: A pump station arrangement for removing harmful fluids from wastewater and a method for removing harmful fluids from wastewater in such a pump station arrangement. The pump station arrangement includes a pre-chamber, a pump sump, a recirculation channel extending from the pump sump to the pre-chamber, and a gas sensor arranged in the pump sump and configured to measure the content of harmful fluids in the form of gas in the pump sump. The pump station arrangement is configured to recirculate the wastewater via the recirculation channel from the pump sump to the pre-chamber if the measured content of harmful fluids in the form of gas in the pump sump exceed a predetermined value. Also disclosed is.

Abstract: 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 is arranged between the inlet and the outlet. The liquid treatment zone includes 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, 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. The inlet, the transition zones, the treatment zone and the outlet confine the liquid flow in a closed channel, so 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.