NOVELTY - Wastewater containing high-concentration fuel ethanol is treated by utilizing one-stage anaerobic treatment and two-stage aerobic treatment. The anaerobic treatment uses an intermediate-temperature fermentation upflow anaerobic sludge blanket (UASB) retort. The water generated in anaerobic treatment is reduced by an energy dissipating tank and enters a pre-aeration tank after a part of the anaerobic sludge is deposited. The water is drained via aeration and precipitation. Methane generated in the anaerobic fermenting tank enters a methanol cabinet as a reproducible energy.    USE - Method for treating wastewater containing high-concentration fuel ethanol (claimed).    ADVANTAGE - The electric energy generated can satisfy the power use demand for treating sludge, and the rest electric energy is supplied for production of fuel ethanol. The sludge treating method has low operation cost and high treatment efficiency. The whole sludge treating system has zero energy supply. There is a little remaining produced electric energy. The anaerobic water is not easy to be accumulated and blocked in the operation, thus realizing win-win target of environment and energy.    DETAILED DESCRIPTION - Treatment of wastewater containing high-concentration fuel ethanol involves pre-treating the wastewater using grain such as wheat as main raw material via grids and a flat-flow depositing pool and putting the wastewater in a regulating pool. The pH of the input water is regulated to satisfy the water input and ecotope demand of a UASB retort. An intermediate-temperature UASB resort is used to generate methanol by anaerobic fermentation at pH of 6-8.5. Anaerobic input water chemical oxygen demand (COD) is controlled to 4500-5500 mg/liter. The fermentation is at 37-42 degrees C. The volume load is controlled at 5-7 kg/COD/m3. The methanol enters a methanol cabinet for methanol electricity generation. The high-temperature exhaust gas generated by methanol electricity generation is used for drying the sludge. The methanol electricity generation output water is put in a pre-aeration tank via an open water tank after passing through an energy dissipating tank. Dissolved oxygen is controlled to 0.5-2 mg/liter. Sludge volume (SV30min) is controlled to 20-30%. The output water is put in a sequencing batch reactor (SBR) pool after the water is precipitated in the precipitating pool for 2.5-4.5 hours. Mixed-liquor suspended solids of the SBR pool are controlled to 2000-8000 mg/liter. The water is drained after it is qualified via aeration and precipitation. The rest sludge generated in methanol production and sewage treatment is concentrated and separated in a sludge dehydrator. The sludge is dried by high-temperature exhaust gas generated in electricity generation via methanol.