The invention relates to a method and an arrangement for wastewater treatment, in which at least portions of the sewage sludge contained in the wastewater (0) are subjected to a hydrolysis (8). The hydrolysis (8) is carried out as a thermal hydrolysis. After the hydrolysis step (8), a drying process is (19) carried out. The drying process (19) is a process operating with positive pressure in the steam region. At least parts of the steam resulting from the drying process (19), which operates with positive pressure, are fed (20) to the portions of the sewage sludge in the thermal hydrolysis (8).

The invention relates to a method and an arrangement for wastewater treatment, in which at least portions of the sewage sludge contained in the wastewater (0) are subjected to a hydrolysis (8). The hydrolysis (8) is carried out as a thermal hydrolysis. After the hydrolysis step (8), a drying process is (19) carried out. The drying process (19) is a process operating with positive pressure in the steam region. At least parts of the steam resulting from the drying process (19), which operates with positive pressure, are fed (20) to the portions of the sewage sludge in the thermal hydrolysis (8).

A method for removal and recovery of phosphorus includes a precipitation step for precipitating phosphorus from a liquid stream comprising at most 30 mg of phosphorus per litre and at most than 50 mg of suspended solids per litre, using a precipitation agent, to form a precipitate, to form a precipitate; a first separation step for separating the precipitate from the liquid stream; a dissolution step for dissolving the precipitate in phosphoric acid to obtain a first solution; and a second separation step for separating the phosphoric acid and the precipitation agent.

An apparatus for separating hydrocarbons from water, comprising a tank segment with a fluid inlet subsequent a housing with a liquid gas mixer. The fluid inlet through a cylindrical tank wall,and further through the wall of a conical wall segment, a pipe spread, combining radial and axial flow over ring mounted guide vanes at the upper part of the conical wall segment. A hydro carbon outlet is located at a top end and a water outlet at a bottom end of tank-segment. A pipe for scale and debris removal is connected to the lower part of the bowl. The inner conical wall segment extends to the top end of the tank segment and at this location comprises a ring of vertically mounted guide vanes.

An apparatus for separating hydrocarbons from water, comprising a tank segment with a fluid inlet subsequent a housing with a liquid gas mixer. The fluid inlet through a cylindrical tank wall,and further through the wall of a conical wall segment, a pipe spread, combining radial and axial flow over ring mounted guide vanes at the upper part of the conical wall segment. A hydro carbon outlet is located at a top end and a water outlet at a bottom end of tank-segment. A pipe for scale and debris removal is connected to the lower part of the bowl. The inner conical wall segment extends to the top end of the tank segment and at this location comprises a ring of vertically mounted guide vanes.

An apparatus (12) for treating water, in particular for removing surfactants from waste water, includes a vessel (14), defining an inlet (16) for receiving waste water containing air bubbles, and an outlet (20) for the exit of water, following treatment. Inside the vessel there is at least one tubular member (50) having a lower open end (52) into which the flow of waste water from the inlet may be directed in use. The tubular member (50) extends from the inlet towards a top of the vessel where an upper exit (54) from the tubular member is defined. In use, most un-aerated water entering the vessel through the inlet can exit the tubular member at the lower open end. Foam formed in the water by the air bubbles may travel up the tubular member to the upper exit, which is preferably located above the water level (60) in the vessel.

Multiple site purification can be achieved by a small plastic portable voltaic inspissation unit in a box configuration. Each unit may feature an air hopper, a recirculation line, a gas diffuser, a centrifuge, a decanter, and multiple anodic and cathodic voltaic inspissation plates that may direct fluid through a box in a meandering or serpentine fashion. Multiple devices may be present or omitted, and retention times may be varied both by the presence or absence of recirculation and the flow rate accomplished by use of different metal in the plates depending on purification goals. Air may be injected interstitially prior to passage into the box to aid in purification, and ultimately both ease of transport and substantially improved purification percentages may be achieved relative to prior systems.

Multiple site purification can be achieved by a small plastic portable voltaic inspissation unit in a box configuration. Each unit may feature an air hopper, a recirculation line, a gas diffuser, a centrifuge, a decanter, and multiple anodic and cathodic voltaic inspissation plates that may direct fluid through a box in a meandering or serpentine fashion. Multiple devices may be present or omitted, and retention times may be varied both by the presence or absence of recirculation and the flow rate accomplished by use of different metal in the plates depending on purification goals. Air may be injected interstitially prior to passage into the box to aid in purification, and ultimately both ease of transport and substantially improved purification percentages may be achieved relative to prior systems.

Method and system for treating wastewater includes treating sludge with ozone in a plug-flow type reactor to cause lysis of biosolids in the sludge. The ozonated sludge may be provided to an anaerobic or anoxic section of the wastewater treatment system to aid the denitrification processes occurring in the anaerobic or anoxic section of the wastewater treatment system or to other sections of the wastewater treatment system such as a fermenter, an aerobic digester, or an anaerobic digester.

A method and apparatus for treating waste water utilizing two energized agitated electrochemical reaction reactor units (each utilizing approximately 10 amps per gallon) with a reaction time of approximately 5 minutes wherein the first reaction vessel has a pH below 7 and a second reaction vessel has a pH of above the pH of the first reaction vessel and the effluent flows from a first agitated electrochemical reaction vessel to a degassing tank and then flows to a second agitated electrochemical reaction vessel and then to a flocculation tank.