Fecha de publicación: -- Fuente: WIPO "biotechnology" The invention relates to biotechnology and can be used in fermentation, particularly at distilleries. An anaerobic bioreactor contains biomass and biogas separator disposed in the upper part, and the waste waters distribution collector disposed in the lower part. According to the invention the bioreactor is equipped in the upper part by a nozzle of square shape, and a hermetic cover. The biomass and biogas separator is disposed in the nozzle which contains a chamber for collecting biogas and separating the foam. Application of the invention provides for enhancement of waste waters purification and biogas separation efficiency, reduction of time of waste waters fermentation, simplifying apparatus assembling and maintenance.