NOVELTY - An induced sludge blanket anaerobic reactor (10) comprises an inlet (16), an outlet (56), and a septum (20) within a vessel (12) to maintain solid particles below the septum, and a sludge blanket control mechanism having an auger (30) to force solid down to a bottom zone of the vessel beneath the septum.    USE - For treating wastewater containing high concentration of organic matter in agricultural production and food processing.    ADVANTAGE - The reactor has controlled sludge bed within the reactor to enhance and improve the anaerobic digestion process. The bioreactor quickly forms a sludge blanket within the bioreactor and controls the density of the sludge blanket. The bioreactor has the ability to separate the various types of bacteria needed for the anaerobic breakdown of organics by forming gradients in single sludge blanket reactor by providing separate tanks for the various stages of anaerobic digestion. The bioreactor has a device to assist in separating settling solids from the liquid or wastewater in which the settling solids are suspended. The sludge blanket control mechanism forms and maintains the sludge blanket or sludge bed held below the septum to hold anaerobic bacteria within the bioreactor. By retaining the anaerobic bacteria within the sludge blanket area, there remain more bacteria for breakdown of the organics in a waste stream. By utilizing the sludge blanket control mechanism, wastewater can be treated much faster and much more efficiently in the reactor as compared to other prior bioreactors. This reduces capital costs, management required, and makes it easier to build and scale up. The reactor makes it much easier for an inexperienced operator to manage the anaerobic digester without having to know how the anaerobic digester actually works.    DESCRIPTION OF DRAWING(S) - The figure shows a front elevation view including a broken away portion showing interior of the bioreactor.    anaerobic reactor (10)    vessel (12)    wastewater (14)    inlet (16)    septum (20)    frame (22)    aperture (24)    auger (30)    access port (44)    outlet pipe. (56)