Abstract: A pump device for delivering fluid to be pumped includes at least one drive unit with a drive and at least one receiving region on which at least two pump cartridges can be positioned so as to be hydraulically connected in series.

Abstract: A low pressure mercury gas discharge ultraviolet lamp with a tubular elongate body with two opposing ends, a first end and a second end, which contains a gas filling, and with at least two electric connectors at each end, which are electrically connected to at least one filament being provided at each end. A discharge length is defined between the filaments, in which at least two filaments are provided at each end of the discharge length. The filaments can be individually supplied with electric energy. The at least two filaments at the first end are of different size and different mass, and the at least two filaments at the second end are of different size and different mass.

Abstract: A guide rail assembly for a submersible machine as well as a guide rail holder for such a guide rail assembly is described herein. The guide rail holder includes a radially extending support body and an axially extending post, which is rigidly connected to the support body and which is adapted to be inserted into an end of the guide rail. An engagement head is connected to the post at a distance from the support body and has a greater radial extension than the post. The engagement head includes a radially expandable member that is adapted to be reversibly manipulated between an active state, in which the expandable member is in engagement with the guide rail, and an inactive state, in which the expandable member is disengaged from the guide rail.

Abstract: A pump for pumping a liquid, includes an impeller and an axially extending drive shaft assembly, wherein a distal end of the drive shaft assembly is received in a central recess of the impeller. The drive shaft assembly includes a drive shaft and a connector. The connector includes a sleeve that is in telescopic engagement with the drive shaft. During operation of the pump the impeller is displaceable in the axial direction in relation to the sleeve between a distal rest position and a proximal position. The impeller is biased towards the distal rest position by a spring member arranged between the sleeve and the impeller.

Abstract: Method for controlling a water treatment installation having a supply, an ozonization stage, a transfer stage, a biological filter and a discharge having the following steps: measuring a first parameter set in the supply, wherein, a measurement for a first concentration of micro-contaminations and/or a nitrite concentration is determined; controlling the ozonization stage in such a manner that an ozone supply is carried out in a preselected ratio to the measured first parameter set; measuring a second parameter set in the transfer stage, wherein, a measurement for a second concentration of micro-contaminations is determined; controlling the ozonization; measuring a third parameter set in the discharge, wherein, with reference to the third parameter set, a measurement of a third concentration of micro-contaminations is determined; if the measurement for the concentration of micro-contaminations exceeds a predetermined maximum value in the discharge, increasing the ozone supply.

Abstract: A treatment plant and a method for controlling such a treatment plant suitable for treatment of waste water. The treatment plant includes a circulation channel adapted to house a liquid, an aeration arrangement adapted to supply a gas flow Q including oxygen to the liquid, at least one flow generating machine arranged in the circulation channel and adapted to generate a liquid flow along the circulation channel, and a control unit.

Abstract: A plant and method for controlling such a plant suitable for treatment of waste water. The plant includes a basin, a flow generating machine adapted to generate a liquid flow in the basin, equipment in the basin that effects the momentum of the liquid flow, and a control unit. The method includes the steps of: storing a predetermined relationship between the operational speed N of the flow generating machine and an operational parameter P from which the torque M of the flow generating machine may be derived, determining the operational speed N, determining a set value of the operational parameter P of the flow generating machine, determining a real value of the operational parameter P of the flow generating machine, and adjusting the operational speed N if the real value of the operational parameter P is different than the set value of the operational parameter P.

Abstract: Method for determining the UV transmittance of water in a UV disinfection plant, through which water flows, wherein the UV disinfection plant has a plurality of radiator arrangements, each with a UV radiation source, a sleeve tube which surrounds the UV radiation source and which has an end face at an open end, and with a UV-C sensor which detects the UV radiation emerging from the sleeve tube without the influence of the water, and with at least one further UV sensor which is arranged at a distance from the sleeve tubes of the radiator arrangements, wherein the method includes the following steps: measuring the UV radiant power emerging from the sleeve tube; measuring an amount of the transmitted radiant power by the further UV sensor; and determining the transmittance of the water by an amount of the emerged radiant power and of the transmitted radiant power.

Abstract: A low pressure mercury gas discharge ultraviolet lamp with a tubular elongate body with two opposing ends, a first end and a second end, which contains a gas filling, and with at least two electric connectors at each end, which are electrically connected to at least one filament being provided at each end. A discharge length is defined between the filaments, in which at least two filaments are provided at each end of the discharge length. The filaments can be individually supplied with electric energy. The at least two filaments at the first end are of different size and different mass, and the at least two filaments at the second end are of different size and different mass.

Abstract: An ozone generator with a high voltage electrode and at least one counter electrode which limit a gap in which at least one dielectric is arranged and which is flowed through by a gas flow in the direction of flow. The high voltage electrode and the at least one counter electrode are provided with a connection for an electrical power supply to generate silent discharges. A fabric is arranged in the gas flow. The fabric includes a material combination including at least one wire and at least one electrically non-conductive fiber.

Abstract: A UV radiator unit includes an elongated gas discharge lamp with an essentially cylindrical UV transparent lamp body with sealed ends, which encloses a gas volume. The lamp body defines a longitudinal axis and has an outer diameter. A UV transparent sleeve tube with an inner diameter, which surrounds the lamp body and wherein the inner diameter is larger than the outer diameter of the lamp body. At least one damping ring is interposed between the lamp body and the sleeve tube. The damping ring includes a first side element, a second side element and at least one connecting portion. An axial distance is provided between the first side element and the second side element. The at least one connecting portion physically connects the first side element and the second side element.

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 are provided with a connection for an electrical voltage supply to generate corona discharges which are discharged from surface discharge locations. The mean sparking distance and the mean spacing between the high-voltage electrode and the at least one counter-electrode are constant. The number of surface discharge locations decreases in the flow direction.

Abstract: A pipe connector for connecting a first element to a second element. The pipe connector includes a pipe segment, a first flange located at a first end of the pipe segment and configured to be connected to the first element, and a second flange located at a second end of the pipe segment and configured to be connected to the second element. The first flange includes a circumferential anchor flange that is fixedly connected to the pipe segment at the first end. A flange insert is displaceable in the axial direction of the pipe connector in relation to the anchor flange between a retracted position and an extended position, and a mechanism for displacing the flange insert in relation to the anchor flange. The flange insert in the extended position protrudes in the axial direction in relation to the anchor flange.

Abstract: A pump device is proposed for arrangement on a recirculation line of an industrial water system including a feed pump, a check valve and a bypass line for the check valve. The bypass line is arranged in parallel to the check valve and wherein a combination of the check valve and bypass line is arrange in series to the feed pump.

Abstract: A feed pump to increase the pressure in a line includes a pumping chamber for a pumping medium. At least one temperature sensor, which is arranged in the feed pump, is allocated to the pumping chamber and is in thermal contact with the pumping chamber for determining a temperature of the pumping medium in the pumping chamber. A temperature control device is allocated to the at least one temperature sensor and by which defined temperature conditions can be created in an area surrounding the at least one temperature sensor. An evaluation device to which the at least one temperature sensor is coupled for signal purposes uses the data from the at least one temperature sensor to determine whether pumping medium is flowing through the pumping chamber or not.

Abstract: A method and an installation for treating a main wastewater stream flowing in a closed conduit with a flow direction. The method includes the steps of: introducing a liquid into at least one pre-treatment stream; generating a gas stream containing ozone gas; introducing the gas stream into the at least one pre-treatment stream, each with a gas injector, resulting in at least one mixed-phase stream comprising ozone laden gas and liquid; passing the at least one mixed-phase stream through at least one static mixer, resulting in a predefined gas bubble size; and injecting the at least one mixed-phase stream in the main wastewater stream perpendicular to the flow direction.

Abstract: An ozone generator with a high voltage electrode and at least one counter electrode which limit a gap in which at least one dielectric and an electrically non-conductive structure are arranged and through which a stream of gas flows in a direction of flow. The high voltage electrode and the at least one counter electrode are provided with a connection for an electrical voltage supply in order to generate silent discharges. The electrically non-conductive structure contains pores with a nominal pore size (x) of 100 ?m<x<1 mm.

Abstract: A chain tensioning arrangement for a column pipe which is configured to house a submersible pump. The chain tensioning arrangement includes a radially extending cross beam, a spring arrangement connected to the cross beam, at least one spring member, and an arm that is movably connected to the cross beam. The arm includes an engagement member configured to optionally engage a chain connected to the pump. The arm is displaceable in the axial direction between a lower position and an upper position. The spring member is arranged to displace the arm in the direction from the lower position towards the upper position. Also described is a pump station including a column pipe, a submersible pump arranged in the column pipe and an axially extending chain connected to the pump and configured to move the pump in the column pipe.

Abstract: Method for controlling a water treatment installation having a supply, an ozonisation stage, a transfer stage, a biological filter and a discharge having the following steps: measuring a first parameter set in the supply, wherein, a measurement for a first concentration of micro-contaminations and/or a nitrite concentration is determined; controlling the ozonisation stage in such a manner that an ozone supply is carried out in a preselected ratio to the measured first parameter set; measuring a second parameter set in the transfer stage, wherein, a measurement for a second concentration of micro-contaminations is determined; controlling the ozonisation; measuring a third parameter set in the discharge, wherein, with reference to the third parameter set, a measurement of a third concentration of micro-contaminations is determined; if the measurement for the concentration of micro-contaminations exceeds a predetermined maximum value in the discharge, increasing the ozone supply.

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.