NOVELTY - Treatment of acetic acid wastewater and papermaking wastewater includes anaerobically fermenting 4:5-6 mixture of acetic acid wastewater with pH of 3-5 and papermaking wastewater with pH of 11-12 at 58plus minus 1degrees C for 10-12 days. The fermentation broth is cooled and clarified. The supernatant is subjected to secondary anaerobic fermentation at 37plus minus 1degrees C for 50-60 hours. The supernatant of secondary fermentation broth is subjected to third anaerobic fermentation at 33plus minus 1degrees C for 3-4 hours. The supernatant of third fermentation broth is treated in air bearing pond, A/O pond and sedimentation tank.    USE - For treating acetic acid wastewater and papermaking wastewater.    ADVANTAGE - The method reduces pollution load of papermaking wastewater and acetic acid wastewater by 96% and creates more favorable condition for middle section of wastewater in the paper mill and acetic acid wastewater treatment, reaching the standard to discharge.    DETAILED DESCRIPTION - Treatment of acetic acid wastewater and papermaking wastewater includes mixing acetic acid wastewater with a pH of 3-5 and papermaking wastewater with a pH of 11-12 in a volume ratio of 4:5-6. The pH of mixed solution is 6.5plus minus 0.2. The papermaking wastewater is black liquor from pulp washer. The mixed solution is added in anaerobic effluent of alcohol wastewater and anaerobically fermented at 58plus minus 1degrees C for 10-12 days. The anaerobic liquid with pH of 7.5plus minus 0.5 is anaerobic effluent performs anaerobic fermentation for alcohol wastewater. The fermentation broth is cooled and clarified. The supernatant is added in another container for secondary anaerobic fermentation at 37plus minus 1degrees C for 50-60 hours. The supernatant of secondary anaerobic fermentation broth is subjected to third anaerobic fermentation at 33plus minus 1degrees C for 3-4 hours. The supernatant of third anaerobic fermentation broth is treated in air bearing pond, A/O pond and second sedimentation tank. Chemical oxygen demand (CODcr) of treatment liquid is less than 300 mg/L, pH value is 6-9; NH3-N is less than 25 mg/L, SS is less than 150 mg/L and the supernatant should reach the effluent standard.