NOVELTY - The method comprises enriching a domestic wastewater with organic materials, transporting to a collecting container by a pressure sewage system and then anaerobically pretreating in a first reactor (22), and separately taking away the anaerobically pretreated waste water and incompletely rotted sludge from the first reactor of biogas through the pretreatment. Energy is extracted from the biogas and the anaerobically pretreated waste water is again aerobically treated. The incompletely rotted sludge is anaerobically treated in a second reactor (38).    USE - Method for treating domestic wastewater occurring in households.    ADVANTAGE - The method ensures economical treatment of domestic wastewater occurring in households with less effort in environmental friendly manner.    DETAILED DESCRIPTION - The method comprises enriching a domestic wastewater with organic materials, transporting to a collecting container by a pressure sewage system and then anaerobically pretreating in a first reactor (22), and separately taking away the anaerobically pretreated waste water and incompletely rotted sludge from the first reactor of biogas through the pretreatment. Energy is extracted from the biogas and the anaerobically pretreated waste water is again aerobically treated. The incompletely rotted sludge is anaerobically treated in a second reactor (38). The waste water is organically enriched through crushed kitchen scraps. External water like rain water is kept away from the waste water transported by the pressure sewage system. The enriched waste water is anaerobically pretreated over a period (t) in the first reactor, which is operated in such a way that the organic solid material of 60-80% is decomposed during the pretreatment time. Mesophile or thermophile conditions are adjusted in the first and second reactor by heat supply. The anaerobically pretreated waste water drawn-off from the first reactor is post-treated by contact biological process. The aerobic biological post-treatment is carried out in a fluidized bed reactor, solid bed reactor or in a reactor in which contact pore in the waste water submerges. The solid material is separated from the aerobic post-treated waste water by microsieving, microfiltration or ultrasound filtration and is used after separation of the solid materials for irrigation. The separated solid material is supplied to the second reactor. Nitrogen and phosphorus are precipitated from the anaerobically pretreated waste water by magnesium-ammonium-phosphate precipitation. A biological nitrogen- and phosphorus elimination is integrated into the aerobic post-treatment. The dried or suspended biomass is additionally supplied to the second reactor. A partial flow of the sludge taken from the second reactor is led back as contact sludge into the intake of the first reactor. The sludge is dewatered and dried. The rotted mud is thickened, dewatered and/or dried to a dry substance content of 25%. The drying is carried out by a solar drying and the dried sludge is used as fuel or as nutrient manure. The dried sludge is pressed in pellets. The biogas drawn-off from the first reactor and the second reactor for converting is used as fuel. The biogas is brought to gas turbine or a communal heating/power station. The heat occurring in the conversion of biogas is used for heating the first and/or the second reactors and/or for drying the rotten sludge. The rain water kept away from the domestic waste water is treated by solid-/fluid separation. The treated rain water is subjected to the microsieving, microfiltration or ultrasound filtration. The treated rain water is collected and is used for externally cleaning or street cleaning or as water of firefighting. The treated rain water is brought to water resources management. The floatate occurring in the rain water treatment is brought to the second reactor. The sediments and/or residues from the solid separation in the rain water treatment is dewatered and deposited. The waste water from a pre-thickening, post-thickening, dewatering and/or drying the sludge is brought to the first reactor. An INDEPENDENT CLAIM is included for urban supply and disposal system for treating domestic wastewater occurring in households.    DESCRIPTION OF DRAWING(S) - The figure shows a supply and disposal system for treating domestic wastewater occurring in households.    First reactor (22)    Second reactor (38)    Sludge dewatering device (42)    Solid-/fluid separation plant (57)    Microfiltration device. (60)