NOVELTY - Modular plant for anaerobic treatment of faecal sludge of urban wastewater, comprises e.g. at least one elevated inlet region for wastewater, at least one device for separating coarse grained particles, at least one device for separating fat, at least one device for anaerobic treatment of wastewater and for sedimentation of solids to form sludge, at least one artificial wet area for further purification of anaerobically treated wastewater, at least one device for dewatering sludge that is separated from the wastewater, and at least one device for composting and disinfecting the dried sludge.    USE - The modular plant is useful for anaerobic treatment of faecal sludge of urban wastewater. The partition wall reactor module is useful in the modular plant for anaerobic treatment of the faecal sludge of urban wastewater (all claimed).    ADVANTAGE - The plant: can be quickly modified and/or repaired without interrupting its operation; is self-supporting and stable; comprises the essential functional elements present in an easily accessible manner and thus the leaks can be found and sealed in a simple way and also the damages inside the plant can be easily repaired; ensures easy replacement of damaged or destroyed parts; and carries out the anaerobic treatment of the faecal sludge of the urban wastewater in a cost-efficient manner.    DETAILED DESCRIPTION - Modular plant for anaerobic treatment of faecal sludge of urban wastewater, in which the wastewater is conductible through the functional devices of the plant, under the action of gravity or force of gravity and under the action of pressure of biogas that is producible from the wastewater, and without the supply of technical energy, comprises (a) at least one elevated inlet region for the wastewater, (b) at least one device for separating coarse grained particles, (c) at least one device for separating fat, (d) at least one device for anaerobic treatment of wastewater and for sedimentation of solids to form sludge, where the wastewater is conductible against the sedimentable solids in an ascending manner, (e) at least one artificial wet area for further purification of anaerobically treated wastewater, (f) at least one device for dewatering the sludge that is separated from the wastewater, (g) at least one device for composting and disinfecting the dried sludge, and (h) functional devices for generating biogas and (i) functional devices for sedimenting solids and for forming and compacting the sludge under anaerobic conditions. The device (b), the device (c), the device (h), the device for sedimenting solids to form sludge, or the device (i) is a module, which is constructed from prefabricated and standardized components made of concrete and/or fiber-reinforced composite materials. INDEPENDENT CLAIMS are also included for:    (1) treating the faecal sludge of the urban wastewater, comprising passing the wastewater through the functional devices of the above plant under the action of gravity or force of gravity and under the action of the pressure of the biogas produced from the wastewater, and without supplying the technical energy, where the above modular plant and/or a partition wall reactor module is used for treating the faecal sludge of the urban wastewater; and    (2) a partition wall reactor module for anaerobic treatment of faecal sludge of urban wastewater, through which the wastewater is conductible in horizontal overall flow direction in a meandering pattern, and in an descending and ascending manner, under the influence of gravity and/or the pressure of the biogas that is producible from the wastewater, comprising prefabricated and standardized components made of concrete and/or fiber-reinforced composite material, containing a front wall portion, a bottom portion, a rear wall portion, a ceiling portion and two side wall portions, which are joined with a container in a fluid-tight manner, at least one inlet to the container, present on the front wall portion, at least one outlet from the container present at the rear wall portion, and at least two vertical partition wall parts, which are connected with the bottom part and the side wall parts in a fluid-tight manner and extend up into a gas chamber above the fluid level in the operating state so that at least three reaction chambers that are successively arranged when seen in flow direction, and fluidically connected with each other, are formed, where the vertical partition wall part in its upper region below the fluid level in the operating state, exhibit at least one flow-through device, which is fluidically connected with the preceding reaction chambers, when viewed in the flow direction, and is fluidically connected with a vertically extending device, which is arranged in the next reaction chamber, and has a lower fluid outlet opening, and at least three manholes that are reversibly sealable by sealing parts, located in the ceiling part.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flow diagram of the modular plant with a biogas reactor.    Inlet for waste water in inlet region (1)    Supply pipe from the inlet region for fat trap with integrated sand trap (1a)    Fat trap with integral sand trap (2)    Device for storing the fat separated in the fat trap (2a)    Discharge pipe for separated fat (2b)