| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for carrying out the quantitative measurement of nitrification activity of a mixture liquid and a degree of inhibition of the nitrification activity of raw water in a short time, automatically and precisely as an on-line instrument by sampling the mixture liquid containing a microbe and a waste liquid from an aeration tank to analyze the measured data of DO (dissolved oxygen) acquired by aerating with a measurement device by a computer, and its apparatus. <P>SOLUTION: After a value when a concentration of dissolved oxygen is roughly fixed by aerating the mixture liquid sampled from the aeration tank for a sufficiently long time is set as high finalDO and an overall mass transfer coefficient Kabs of an aerator is determined from a variation curve of the dissolved oxygen concentration determined by repeatedly aerating from a low dissolved oxygen concentration, a standard liquid is loaded and a decomposition rate of the standard liquid is calculated from a DO variation to evaluate the nitrification activity. If the nitrification activity is not less than a set value, next, the raw water is loaded to treat BOD (biological oxygen demand) of the raw water, then the standard liquid is further loaded to calculate the decomposition rate of the standard liquid, and a degree of inhibition of the nitrification activity of the raw water is evaluated from a decomposition rate variation of the standard liquid before and after the raw water is loaded. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
