| 摘要 |
[Problem] Wastewater that contains terephthalic acid, which is difficult to decompose, is anaerobically treated efficiently at low cost, without requiring the use of any complicated apparatus or any complicated operation, to thereby decompose and remove the terephthalic acid to a high degree. [Solution] When wastewater which contains terephthalic acid is anaerobically treated, sulfuric acid radicals are added to the wastewater to be anaerobically treated, so that the wastewater comes to have a sulfuric acid ion concentration of 5-200 mg/L. The addition of a given amount of sulfuric acid radicals to terephthalic-acid-containing wastewater to be anaerobically treated greatly improves the efficiency of terephthalic acid decomposition by the anaerobic treatment. It is preferred that sulfuric acid radicals be added so as to result in a content thereof of 10 mass% or more of the terephthalic acid contained in the wastewater. |
