To provide a method and an apparatus for decomposing fat and oil that can secure sufficient time for decomposing fat and oil while making effective use of slow-growing lipolytic bacteria, when biologically treating waste water containing fat and oil.SOLUTION: In order to solve the above-described problem, there is provided a method and an apparatus for decomposing fat and oil characterized in that a fat and oil adsorption process to adsorb fat and oil in waste water containing fat and oil, an extraction process of extracting water to be treated from which fat and oil have been removed, a feeding process to put liquid containing lipolytic bacteria into adsorbed oil and fat, and a decomposition process to decompose the adsorbed oil and fat by the lipolytic bacteria, are performed in at least one fat and oil treatment tank. Thereby, the fat and oil in the waste water containing fat and oil are retained in the fat and oil treatment tank with a fat and oil adsorption part, and fat and oil decomposition by the lipolytic bacteria can be performed by batch processing. As a result, the fat and oil decomposition time is sufficiently secured, treatment is enabled in an environment where bacteria other than the lipolytic bacteria are less likely to grow, and a performance of fat and oil decomposition is improved.SELECTED DRAWING: Figure 2
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