NOVELTY - The reactor for the anaerobic, biological cleaning of waste water, has a closed tank having an inlet piping system (3) for the waste water in the bottom region and a drain mechanism (5) for the purified water in the head region, and a three-phase separator (4) and a gas collecting space (6) that are arranged between the inlet piping system and the drain mechanism. The three-phase separator apparatus consists of two adjacently-placed, downwardly-tapering drains (9). A separation packet (10) that extends itself along the longitudinal direction of the drain, is arranged in each drain.    USE - For the anaerobic, biological cleaning of waste water (claimed).    ADVANTAGE - The reactor ensures good cleaning achievement and a continuous, trouble-free operation by uniform distribution of the supplied wastewater as well as provides a safe separation of gas, water and mud particles in the three-phase separator, and has less maintenance cost.    DETAILED DESCRIPTION - The reactor for the anaerobic, biological cleaning of waste water, comprises a closed tank having an inlet piping system (3) for the waste water in the bottom region and a drain mechanism (5) for the purified water in the head region, and a three-phase separator (4) and a gas collecting space (6) that are arranged between the inlet piping system and the drain mechanism. The three-phase separator apparatus consists of two adjacently-placed, downwardly-tapering drains (9). A separation packet (10) that extends itself along the longitudinal direction of the drain, is arranged in each drain. Barriers are arranged at the drain for deflecting the gas/water sludge mixture into the separator. A sludge sedimentation region with through-passage opening is formed below the separation packet, so that a settling of the separated sludge particles in the lower tank space is facilitated. The inlet piping system comprises parallelly-aligned pipelines with inlet nozzles. The separation packet made of plastic comprises a multitude of tubular sections that are arranged adjacent to one another, and is built diagonally into the drain of the three-phase separator. The water/sludge-mixture flows from the bottom to the top through the single tubes. The flow direction is accomplished at an angle of 15-45degrees to the vertical axis of the reactor. A cleaning mechanism (14) for the removal of sludge deposits is arranged in the bottom region of the drain. The tubular sections possess a honeycomb structure in the flow cross-section. The pipelines are individually controlled by a measurement and control system. The gas collecting spaces are arranged adjacent to each of the drains. The gas-water-sludge mixture is led over the gas collection spaces and then deflected by the barriers. The cleaning mechanism is designed as sludge scraper, which has a triangular cross-section that matches the drain profile. The sludge scraper is pulled along the bottom region of the drain by means of a rope construction. The water discharge drain for the purified water is arranged centrally between the drains of the three-phase separator apparatus and is designed as an adjustable, saw-toothed drain weir. A measuring device for electro optical turbidity measurement is intended in the region of supply and discharge of the reactor. The measured signals are sent to the measurement and control system. On the basis of a characteristic curve traced in the measurement and control system, a comparison of the set and actual states takes place and the output signal of this analysis controls the inlet volume flow.    DESCRIPTION OF DRAWING(S) - The diagram shows a reactor for the anaerobic, biological cleaning of waste water.    Inlet piping system (3)    Three-phase separator (4)    Drain mechanism (5)    Gas collecting space (6)    Drains (9)    Separation packet (10)    Cleaning mechanism. (14)