Abstract: A process for removing sulphide from an aqueous solution comprising sulphide is disclosed, in which the aqueous solution is subjected to sulphide-oxidizing bacteria in the presence of oxygen in a reactor to oxidize sulphide to elemental sulphur. According to the process, a molecular-oxygen containing gas is supplied to a reactor containing the sulphide-oxidizing bacteria in an aqueous medium, such that one or more aerated zones and one or more non-aerated zones are created in the aqueous medium with upward liquid flow in the aerated zones and downward liquid flow in the non-aerated zones; and a feed stream of the aqueous solution comprising sulphide is injected into the reactor in the one or more non-aerated zones, wherein the one or more aerated zone(s) are not separated from the one or more non-aerated zone(s) by means of vertically extending reactor internal.

Abstract: A process for removing sulphide from an aqueous solution comprising sulphide is disclosed, in which the aqueous solution is subjected to sulphide-oxidising bacteria in the presence of oxygen in a reactor to oxidise sulphide to elemental sulphur. According to the process, a molecular-oxygen containing gas is supplied to a reactor containing the sulphide-oxidising bacteria in an aqueous medium, such that one or more aerated zones and one or more non-aerated zones are created in the aqueous medium with upward liquid flow in the aerated zones and downward liquid flow in the non-aerated zones; and a feed stream of the aqueous solution comprising sulphide is injected into the reactor in the one or more non-aerated zones, wherein the one or more aerated zone(s) are not separated from the one or more non-aerated zone(s) by means of vertically extending reactor internal.

Abstract: A three phase separator or settling device (2) or a digester (1) including the settling device. The settling device can receive a fluid containing liquid, gas and particulate material. The settling device includes a settling chamber to be filled with this fluid. The device can also include a liquid-discharge (5) for discharging liquid from the settling chamber and fitted close to the liquid level (30), a fluid inlet (6) for supplying the fluid into the settling chamber (3), a particulate material separation device (7) and a sludge outlet (8). A flow of fluid is provided into and out of the settling device and settling chamber. The inlet includes a gas separation device (4) for separating gas from the fluid including channels, the inlet positioned close to the fluid level. The inlet and transition (75) into the settling chamber is arranged to create a pre-separated flow pattern including a generally laminar liquid flow.

Abstract: The invention relates to an anaerobic purification device for purification of influent. The device has a reactor tank, an inlet for introducing influent into the tank, a water collecting device for collecting purified water, a gas collecting system for collecting gas from the fluid contained in the reactor, a gas-liquid separation device, a riser for passing liquid into the separation device by gas lifting action caused by gas collected in the gas collecting system, and a downer for returning liquid and sludge from the separation device into the lower tank section. According to the invention this device is characterized in that it is arranged to define, in the downer at the level of the liquid surface, a head pressure of, at least, approximately 1.4 m water column (approximately 0.14 bar). The invention also relates to a method for anaerobic purification device for purification of influent.

Abstract: A three phase separator or settling device (2) or a digester (1) including the settling device. The settling device can receive a fluid containing liquid, gas and particulate material. The settling device includes a settling chamber to be filled with this fluid. The device can also include a liquid-discharge (5) for discharging liquid from the settling chamber and fitted close to the liquid level (30), a fluid inlet (6) for supplying the fluid into the settling chamber (3), a particulate material separation device (7) and a sludge outlet (8). A flow of fluid is provided into and out of the settling device and settling chamber. The inlet includes a gas separation device (4) for separating gas from the fluid including channels, the inlet positioned close to the fluid level. The inlet and transition (75) into the settling chamber is arranged to create a pre-separated flow pattern including a generally laminar liquid flow.

Abstract: The invention relates to an anaerobic purification device for purification of influent. The device has a reactor tank, an inlet for introducing influent into the tank, a water collecting device for collecting purified water, a gas collecting system for collecting gas from the fluid contained in the reactor, a gas-liquid separation device, a riser for passing liquid into the separation device by gas lifting action caused by gas collected in the gas collecting system, and a downer for returning liquid and sludge from the separation device into the lower tank section. According to the invention this device is characterized in that it is arranged to define, in the downer at the level of the liquid surface, a head pressure of, at least, approximately 1.4 m water column (approximately 0.14 bar). The invention also relates to a method for anaerobic purification device for purification of influent.