Abstract: A pump for pumping liquid, the pump including a drive unit and a heat sink arranged to carry off heat that is generated in the drive unit, the drive unit including a motor compartment that in the radial direction is delimited by a motor casing and that accommodates an electric motor having a stator, a coupling compartment that at least partly is delimited by a pump top casing and that accommodates a power supply component, an upper partition that is arranged between the motor compartment and the coupling compartment. The motor casing includes an outer jacket that is connected to and that in the axial direction extends between the upper partition and the heat sink, an inner stator housing that extends between the stator and the heat sink, and a gas filled gap that in the radial direction separates the outer jacket and the inner stator housing.

Abstract: An ozone generator includes a high-voltage electrode and at least one counter electrode, which define an interstice in which at least one dielectric is arranged and through which a gas flows in the flow direction, the high-voltage electrode and the at least one counter electrode being provided with a connection for an electrical voltage supply to generate silent discharges, and a wire fabric being arranged in the gas flow and its density decreasing in the flow direction.

Abstract: An emitter arrangement includes a UV irradiation source, a cladding tube surrounding the UV irradiation source, and a UV-C sensor. The cladding tube has an end face on an open end. The UV-C sensor has a sensitive area, wherein the UV-C sensor is in optical connection with the end face of the cladding tube, so that the sensitive area of the UV-C sensor can detect the UV irradiation emerging from the end face of the cladding tube during the operation of the UV irradiation source.

Abstract: A method for controlling a treatment apparatus arrangement in a treatment plant, the treatment plant including a basin housing a liquid and solid matter. The operating condition in the basin is anoxic and/or anaerobic, and the treatment apparatus arrangement includes at least one mixer machine located in the basin and a variable speed drive operatively connected to the mixer machine. The variable speed drive operates the mixer machine alternately in a Normal Operation Mode, in which an operational speed of the mixer machine is at least the greater of a suspension speed and a process speed, and a Reduced Operation Mode, in which the operational speed of the mixer machine is below the suspension speed. Also described is a treatment apparatus arrangement and a treatment plant, respectively.

Abstract: An impeller assembly and a pump for pumping a liquid, including a pump chamber and an impeller arranged to rotate in the pump chamber, the impeller being suspended in a lower end of an axially extending drive shaft unit, wherein the lower end of the drive shaft unit is received in a cylinder-shaped recess of the impeller, wherein the impeller is displaceable back and forth in the axial direction in relation to the drive shaft unit. The impeller further includes an axially extending hole that connects the cylinder-shaped recess and the pump chamber and that the drive shaft unit includes an axially extending pin that projects from the lower end of the drive shaft unit, wherein the pin is arranged in the hole.

Abstract: A tempering device for tempering of biomass contained in a container, including at least one tempering mechanism, and at least one conveying device for conveying a mass flow of biomass in a main flow direction. The at least one conveying device includes at least one agitator, and wherein the at least one tempering mechanism is arranged in the main flow direction generated by the at least one conveying device. The at least one tempering mechanism is tubular with an inner tube and with an outer tube arranged coaxially to the inner tube. The inner tube and the outer tube form an intermediate space through which a tempering medium may flow. The tempering mechanism is oriented relative to the conveying device such that, in operation of the heating device, at least 40% of the delivery volume of the mass flow generated by the conveying device flows through the inner tube.

Abstract: A method for managing a wastewater treatment process. The method includes at least the steps of measuring an amount of at least one nitrogen-containing substance in the influent wastewater (CN, influent), and determining an amount of phosphorous to be removed from the influent wastewater (CP, influent) based on the measured amount of at least one nitrogen-containing substance in the influent wastewater (CN, influent).

Abstract: A method for treating wastewater by using a coagulant that aggregates a phosphorus-containing substance. The method includes executing a reaction phase having a biological treatment phase and a subsequent chemical treatment phase. The chemical treatment phase includes the first substep of mixing the wastewater while injecting a predetermined dose of the coagulant into the basin in order for the coagulant to contact and coagulate the phosphorus-containing substances. The injection of the dose of the binding compound into the basin is performed during a time period equal to or more than a time period required to accomplish two mixing turnovers of the wastewater and equal to or less than a time period required to accomplish seven mixing turnovers of the wastewater. The second substep includes mixing the wastewater in order to flocculate the coagulated substance.

Abstract: An aerator assembly for diffusing a gas in a liquid, including a gas supply conduit and at least one aerator, wherein the gas supply conduit and the aerator are releasably joined to each other by an attachment. The attachment includes a flexible body and a compressor, wherein the attachment is arranged to be reversibly set in an inactive mode, in which the gas supply conduit and the at least one aerator are in mutually released mode, as well as in an active mode in which the flexible body is compressed in its axial longitudinal direction by the compressor and clamps the at least one aerator and the gas supply conduit against each other.

Abstract: A pump station includes a tank and a pump unit that is lowerable into the tank. The tank has a bottom and a peripheral wall extending from the bottom, and the peripheral wall has an inlet for incoming liquid flow and an outlet for outgoing liquid flow. The pump unit includes a cross beam and a pump connected to the cross beam. The inside of the wall of the tank presents a set of axially extending guide members, which set includes at least a first guide member arranged to receive and guide a first end of the cross beam and a second guide member arranged to receive and guide a second end of the cross beam.

Abstract: A pump station includes a tank and a pump unit that is lowerable into the tank. The tank has a bottom and a peripheral wall extending from the bottom, and the peripheral wall has an inlet for incoming liquid flow and an outlet for outgoing liquid flow. The pump unit includes a cross beam and a pump connected to the cross beam. The inside of the wall of the tank presents a set of axially extending guide members, which set includes at least a first guide member arranged to receive and guide a first end of the cross beam and a second guide member arranged to receive and guide a second end of the cross beam.