Biological reactor vessel and method for aerobic, anaerobic or anoxic purification of wastewater, wherein the reactor vessel is filled with carrier elements, on which a biofilm forms

摘要

596609 A reactor (4) for aerobic, anoxic or anaerobic purification of waste water is disclosed. The reactor comprises one or more inlet pipes (1), one or more inlet zones, one or more outlet zones (7) and outlet pipes (2) for water and substrate, one or more outlet pipes for sludge (3), and one or more mixing mechanisms (6) for transport of water and substrate. The reactor also comprises a filling of carrier elements (5), on which a biofilm may form. 90%-100% of the reactor liquid volume may be constituted by the biofilm carrier elements during normal operation of the reactor. During normal operation, the carrier elements are not free to move. During sludge removal the water level in the reactor is raised such that the carrier elements become fluidised and are able to move freely with the help of one or more of the mixing mechanisms. A method for biological purification of water is also disclosed.