| abstract |
(57) [Problem] To provide a purification method and a purification process capable of stably and efficiently performing anaerobic treatment of wastewater containing fats and oils or waste containing fats and oils. SOLUTION: The present invention relates to an anaerobic treatment step of an oil-and-fat-containing pollutant, wherein the concentration of hydrogen-producing acetic acid producing bacteria (a), the concentration of hydrogen-utilizing methane producing bacteria (b), and the concentration of acetic acid Monitoring the ratio (a: b: c) of the concentration of the metabolizable methanogen (c), The present invention relates to an anaerobic treatment method characterized by controlling operating conditions such that the ratio is maintained within a predetermined range. |