| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently treat organic wastewate having a high concentration of organic substances. SOLUTION: The concentration of BOD of raw water in a raw water tank 10 is measured by a BOD analyzer 22. A control unit 24 controls a nitrogen pump 32 and a phosphorus pump 34 so that the addition amounts of nitrogen and phosphorus become smaller than theoretical values in the case of high concentration as compared with the case of low concentration.</p> |
