PROBLEM TO BE SOLVED: To provide an apparatus for treating anaerobic waste water, from which the amount of the granules flowing out together with the treated water can be reduced and which is excellent in stability of the capacity for treating anaerobic waste water and exhibits high efficiency when used for treating anaerobic waste water.;SOLUTION: The apparatus 1 for treating anaerobic waste water is characterized in that the water to be treated is made to pass through an anaerobic sludge layer 10 comprising granules 31 as an upward flow to decompose the organic matter in the water to be treated and discharge the organic matter-decomposed water as the treated water. The anaerobic sludge layer 10 is composed of a high-concentration sludge layer 3 and a low-concentration sludge layer 4 which is arranged on the downstream side of the high-concentration sludge layer 3 and has the granule 31 concentration lower than that of the high-concentration sludge layer 3. A gas-liquid separating means 5 for collecting the gasses in the water to be treated is arranged between the high-concentration sludge layer 3 and the low-concentration sludge layer 4 and a circulation means 8 is arranged for withdrawing a part of the water to be treated in the low-concentration sludge layer 4 and supplying the withdrawn water to the uppermost-stream part of the high-concentration sludge layer 3.;COPYRIGHT: (C)2009,JPO&INPIT
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