Abstract: An injection element for injecting a fluid into a tank, especially for injecting water into the tank, especially into a fish tank, wherein the injection element comprises an outer pipe and an inner pipe arranged at least partially inside the outer pipe, wherein the inner pipe is extractable at least partially out of an outlet end of the outer pipe, wherein an inlet end of the outer pipe is configured to be connected with a fluid providing device, wherein the outer pipe is configured to be arranged mainly outside of an interior volume of the tank and an outlet end of the outer pipe is configured to be connected with an opening in a wall of the tank.

Abstract: A plant for aquaculture, for farming of fish or other aquatic species, comprising a closed or semi-closed tank, at least one inlet for water to the tank and an outlet for water from the tank. The plant is distinguished in that the outlet comprises two pipes, wherein an outer pipe is arranged outside an inner pipe, the outer pipe extends from a bottom of the tank up to an outer pipe upper end, and the outer pipe comprises openings distributed along the immersed part of the outer pipe, the inner pipe extends from the bottom of the tank up to an inner pipe upper end, and the inner pipe comprises an outlet opening at the inner pipe upper end and/or outlet openings at elevation below the inner pipe upper end, and a main outlet from the tank is arranged in the tank bottom in position inside the inner pipe.

Abstract: The invention relates to a method for controlling a concentration of dissolved oxygen in a volume (V) of water (W), wherein a device (1) for dissolving oxygen in water (W) is submerged in said volume (V) of water, wherein oxygen is injected by the device (1) with an adjustable flow rate into a main water stream (W?) sucked into a housing (100) of the device (1), and wherein the oxygen enriched main water stream (W?) is discharged by the device (1) out of the housing (100) of the device (1) into said volume (V) of water (W), and wherein a current concentration of oxygen dissolved in the sucked main water stream (W?) is measured with an oxygen probe (6) that is integrated into the housing (100) of the device (1), wherein said current concentration of dissolved oxygen is transmitted in a wireless fashion to a hand-held device (9) of an operator, and wherein the flow rate of the injected oxygen is controlled such that the measured current concentration of dissolved oxygen approaches a pre-defined reference value.

Abstract: An apparatus for dissolving gas into a liquid, comprising a housing with an inlet opening for the liquid and an outlet opening for the liquid, and a blade unit arranged inside the housing in a small cross section area between the inlet opening and the outlet opening, wherein a flow cross section for the liquid at the small cross section area is smaller than at the inlet opening, further comprising a gas inlet provided at an outside of the housing and at least one gas outlet provided in the housing on a surface of the blade unit, the at least one gas outlet being connected to the gas inlet by means of a channel, and to a method for producing such an apparatus and an use of such an apparatus.

Abstract: The invention relates to a method for controlling a concentration of dissolved oxygen in a volume (V) of water (W), wherein a device (1) for dissolving oxygen in water (W) is submerged in said volume (V) of water, wherein oxygen is injected by the device (1) with an adjustable flow rate into a main water stream (W?) sucked into a housing (100) of the device (1), and wherein the oxygen enriched main water stream (W?) is discharged by the device (1) out of the housing (100) of the device (1) into said volume (V) of water (W), and wherein a current concentration of oxygen dissolved in the sucked main water stream (W?) is measured with an oxygen probe (6) that is integrated into the housing (100) of the device (1), wherein said current concentration of dissolved oxygen is transmitted in a wireless fashion to a hand-held device (9) of an operator, and wherein the flow rate of the injected oxygen is controlled such that the measured current concentration of dissolved oxygen approaches a pre-defined reference value.

Abstract: A device (1) for dissolving a gas (G) in water (W) is provided, and includes a housing (100) configured to be submerged into the water (W) with the housing (100) having at least one water inlet (101), a gas inlet (102) and at least one water outlet (103) for discharging gas enriched water out of the housing (100), a pump (5) in fluid communication with the at least one water inlet (10) for sucking water (W) from a surrounding of the housing (100), the pump configured to generate a main water stream (S?), and means for injecting the gas (G) supplied via the gas inlet (102) into the main water stream (S?). The device (1) includes a probe (6) configured to measure a concentration of the gas dissolved in water, and the probe (6) is arranged in the housing (100) of the device (1).

Abstract: A device (1) for dissolving a gas (G) in water (W) is provided, and includes a housing (100) configured to be submerged into the water (W) with the housing (100) having at least one water inlet (101), a gas inlet (102) and at least one water outlet (103) for discharging gas enriched water out of the housing (100), a pump (5) in fluid communication with the at least one water inlet (10) for sucking water (W) from a surrounding of the housing (100), the pump configured to generate a main water stream (S?), and means for injecting the gas (G) supplied via the gas inlet (102) into the main water stream (S?). The device (1) includes a probe (6) configured to measure a concentration of the gas dissolved in water, and the probe (6) is arranged in the housing (100) of the device (1).

Abstract: The invention relates to a water inlet arrangement for the use in fish tanks in aquaculture, including a pipe to feed water into the tank, the pipe having a plurality of openings and, for a better adjustment of the flow, a surrounding second element having a plurality of openings and/or a fixed or adjustable shield are provided.

Abstract: The invention relates to a water inlet arrangement for the use in fish tanks in aquaculture, including a pipe to feed water into the tank, the pipe having a plurality of openings and, for a better adjustment of the flow, a surrounding second element having a plurality of openings and/or a fixed or adjustable shield are provided.

Abstract: The invention relates to a water inlet arrangement for the use in fish tanks in aquaculture, including a pipe to feed water into the tank, the pipe having a plurality of openings and, for a better adjustment of the flow, a surrounding second element having a plurality of openings and/or a fixed or adjustable shield are provided.

Abstract: A device is provided for supplying gas into water, especially for aquaculture, including a water inlet arrangement with a pipe having a first plurality of openings and a Venturi type gas dissolver unit built in the pipe, and a surrounding second element having a second plurality of openings and/or a fixed or adjustable shield.

Abstract: A method is provided for distribution of a gas in a liquid, such as water, including introducing the gas into a fluid stream to obtain a fluid stream with dissolved gas, and introducing the fluid stream with the dissolved gas therein into the liquid. The fluid stream with the dissolved gas is maintained below a level of said liquid until it is introduced into said liquid.

Abstract: A device is provided for supplying gas into water, especially for aquaculture, including a water inlet arrangement with a pipe having a first plurality of openings and a Venturi type gas dissolver unit built in the pipe, and a surrounding second element having a second plurality of openings and/or a fixed or adjustable shield.

Abstract: The invention relates to a water inlet arrangement for the use in fish tanks in aquaculture, including a pipe to feed water into the tank, the pipe having a plurality of openings and, for a better adjustment of the flow, a surrounding second element having a plurality of openings and/or a fixed or adjustable shield are provided.

Abstract: The invention relates to a device for supplying gas into water in sea cages, tanks or ponds with a pump and a dissolver for contacting the gas with the water. For higher efficiency and better handling the pump is a submerged pump.