Abstract: A method for controlling an ozone generator with a high-voltage electrode, at least one counter electrode, and a gap in which at least one dielectric is arranged and which is perfused by an oxygen-containing gas having a particle density ngas. The high-voltage electrode and the at least one counter electrode are provided with a connection for an electrical voltage supply for generating silent discharges in at least one discharge gap. Striking distances d of the discharge are distributed between a minimum striking distance dmin and a maximum striking distance dmax. For the generation of an ozone concentration>12 wt. % ozone, the voltage amplitude U0 of an AC voltage on the electrical voltage supply is selected so that U0<130*10?21 V*m2*ngas*dmax*(CDL+Cg)/CDL, with CDL=capacitance of the dielectric and Cg=capacitance of the discharge gap.

Abstract: A method for controlling a pump in connection with first activation of the individual pump following a connection of the individual pump to a power supply. The pump is configured to be connected to a Pump Network including a plurality of pumps. When connecting the individual pump to the power supply, the method includes causing the individual pump to remain deactivated, determining a value of at least one Operational parameter (OP) of the individual pump, determining a Reference input value (RIV) based on the determined value of the at least one Operational parameter (OP), utilizing the determined Reference input value (RIV) in a Random pause time function (RF) and obtaining a random Activation pause time (APT) as an output from the Random pause time function (RF), and permitting activation of the individual pump after the Activation pause time (APT) has elapsed.

Abstract: A submersible machine guide assembly suitable for guiding a submersible machine from an upper position towards an operative position. The guide assembly includes a top mount configured to be arranged at the upper region of the tank, a supporting member configured to be arranged in the tank, and two guide wires running along each other in the vertical direction of the tank. Each of the guide wires is connected to the top mount at a first end and is connected to a seat of the supporting member at a second end. A runner is displaceable along the guide wires. The runner includes two guide members that engage the guide wires and that are connected to each other at the lower ends thereof. The lower end of each guide member is configured to engage the corresponding seat of the supporting member when the runner is in the operative position.

Abstract: A de-blocking device for a hydraulic pump includes a can having a longitudinal axis and a conduit extending longitudinally along the longitudinal axis and having a first terminal aperture. The device further includes a bearing fixedly positioned in the conduit spaced from the first terminal aperture, and a plunger axially movably positioned in the conduit between the bearing and the first terminal aperture. A biasing element is positioned between the bearing and the plunger wherein the movement of the plunger toward the bearing compresses the biasing element.

Abstract: A mixer for generating a flow of liquid includes a stationary body, an axially extending drive shaft protruding from the stationary body, a propeller, and a clamping sleeve assembly configured to interconnect the drive shaft and the propeller with each other in order to transmit a rotational motion. The clamping sleeve assembly has an axial clamping length and includes an inner clamping sleeve and an outer clamping sleeve. The inner clamping sleeve has the shape of a tubular wall having an inner surface abutting the drive shaft and an outer surface abutting the outer clamping sleeve and wherein the outer clamping sleeve has the shape of a tubular wall having an inner surface abutting the inner clamping sleeve and an outer surface abutting the propeller. Both the inner surface of the outer clamping sleeve and the outer surface of the inner clamping sleeve are cylindrical along the axial clamping length.

Abstract: A method for controlling a pump arrangement upon clogging. The arrangement includes a pump and a control unit. The pump includes a motor, and the control unit drives the motor. The motor during operation is associated with an operational parameter from which the motor torque may be derived. The operational parameter has a normal value PN during normal operation of the motor in a first direction. The method includes the steps of driving the motor in a first direction by the control unit, stopping the motor if a real value P of the operational parameter exceeds a predetermined clogging limit PI, driving the motor in an opposite second direction a predetermined flushing time TR by the control unit, and stopping the motor if the absolute value of the real value P of the operational parameter during the flushing time TR exceeds the absolute value of a first unfastening limit PL1.

Abstract: A cutter assembly configured for a grinder pump and including a cutter wheel and a cutter disc that interact with each other. The cutter wheel includes a shaft portion that is configured to interact with a central hole of the cutter disc, a hub portion that is connected to the shaft portion and at least two main cutting edges that in the radial direction extend outwards from the hub portion and that are configured to interact with a set of cutting holes of the cutter disc. The shaft portion includes an axially extending cutting recess. The hub portion includes only one radially extending cutting recess. The cutter disc includes a suction side, a central hole that is configured to interact with the shaft portion of the cutter wheel and a set of cutting holes that open in the suction side radially outside the central hole.

Abstract: A method for providing an axial gap in a cutter assembly of a grinder pump in order to secure an operative shearing action at a shearing interface in the cutter assembly. A grinder pump includes a cutter wheel connected to and driven in rotation by a drive shaft. The cutter wheel includes a set of cutting edges, and a cutter disc stationary connected to a pump housing and having a central hole and a set of cutting holes. The drive shaft and the cutter wheel are interconnected via the central hole of the cutter disc, wherein the cutter wheel and the cutter disc constitute the cutter assembly. A shim, which has a thickness equal to or greater than 0.05 millimeters and equal to or less than 0.15 millimeters and that is manufactured from degradable paper or plastic material, is clamped between the cutter wheel and the cutter disc.

Abstract: A pump station arrangement and a method for turning off a pump configured for pumping liquid via a conduit. The pump, before being turned off, being driven at an operational frequency (FN) by a control unit. The method is characterized by the steps of, ramping down the frequency of the pump due to a turn off instruction, the terminal frequency of the ramping down being equal to the operational frequency (FN) of the pump minus at least 10 Hz and the ramping down time being at least a reflection time (TR) for the conduit in question, and the terminal frequency of the ramping down not being less than 10 Hz, and stopping the pump after the ramping down.

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: 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: A pump station for intermediate storage of liquid includes a tank configured to house the liquid, an inlet for influent liquid flow, a pump configured to intermittently discharge liquid from the tank, an outlet for effluent liquid flow, and a flush pipe having a lower opening provided in the tank and an upper opening. The lower opening of the flush pipe is located below a pump start liquid level of the tank, and the flush pipe includes a valve configured to open/close fluid communication between the lower opening of the flush pipe and the upper opening of the flush pipe. The valve is located above the pump start liquid level of the tank. The flush pipe is configured to alternate between a primed state and a released state.

Abstract: A flush valve includes an inlet, an outlet and a valve arrangement. The valve arrangement includes a first chamber, a second chamber that is partly delimited by a diaphragm, a conduit extending between and connecting the first chamber and the second chamber, and a third chamber that connects the inlet and the outlet of the flush valve and that is partly delimited by the diaphragm. The third chamber includes a valve member configured to control a fluid flow from the inlet to the outlet based on the position of the diaphragm, and a control mechanism arranged in the conduit. The control mechanism includes a stepper and a plunger. The plunger is biased towards an inactive position and is displaced towards an active position by the second pressure [P2] in the second chamber when the second pressure [P2] in the second chamber is greater than a threshold value [PT].

Abstract: An ozone generator unit includes a housing with a first half having a first recess and a second half having a second recess. The ozone generator unit further includes an inlet and an outlet in the housing, a first dielectric disc arranged within the first recess in contact with an inner surface of the first half, a second dielectric disc arranged within the second recess in contact with an inner surface of the second half, and a high voltage electrode, having a gas passage, arranged between the first and second dielectric discs. The high voltage electrode is spaced apart from the first and second dielectric discs using a first spacer and a second spacer to constitute a first gas chamber and a second gas chamber on either side of the high voltage electrode.