| 摘要 |
PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus in which an organic acid is efficiently produced from initially settled sludge, the flow-in of a solid substance to a biological reaction tank is prevented and dephosphorization or denitrification is efficiently carried out. SOLUTION: A part of the initially settled sludge taken out from an initial settling basin 12 is crushed by a crusher 17 and introduced to be circulated to the initial settling basin 12. The path for introducing the sludge crushed by the crusher 17 into the initial settling basin 12 can be divided into a path in which the sludge is not brought into contact with air and a path in which the sludge is brought into contact with air. An organic acid fermentor 18 for retaining the initially settled sludge crushed by the crusher 17 to carry out organic acid-fermentation is provided and the initially settled sludge containing the organic acid by the fermentation is introduced to be circulated to the initial settling basin 12 and flow out water in the initial settling basin 12 is introduced into the biological reactor 11 to carry out the waste water treatment. COPYRIGHT: (C)2007,JPO&INPIT
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