摘要 |
PROBLEM TO BE SOLVED: To provide an organic acid production method and an organic acid production device where, as the production rate of organic acid is improved, the economization of energy can be attained, and to provide waste water treatment equipment using the same. SOLUTION: As the organic acid production method where sludge is anaerobically fermented, so as to produce organic acid, a method where the temperature of fermentation sludge S is measured, and, based on the measured temperature, the pH of the sludge during the fermentation is controlled is adopted. According to this method, the pH of the fermentation sludge can be controlled to the optimum one corresponding to temperature, and the production rate of organic acid can be maximized. Thus, in the control for maximizing the production rate of organic acid, energy for warming or cooling the sludge is not required. COPYRIGHT: (C)2007,JPO&INPIT
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