Evaluation of the Characteristics of Microorganisms that Contribute to Denitrification in the Paddy Drainage Treatment Apparatus by Quinone Composition Measurement

Abstract

The relation between the denitrification rate and quinone compositions of the microorganisms in the water treatment apparatus for paddy drainage was evaluated. Q-8 content, the highest ubiquinone, had the strongest correlation coefficient between the denitrification rate (DNR) and the detected ubiquinone. MK-7 had the strongest correlation with DNR among the detected menaquinones. From the results of principal component analysis for DNR using quinone content as the variables, the first principal components were Q-8 and Q-9, and the second principal component was MK-8. Q-8, Q-9, MK-7 and MK-8 containing bacteria strongly contribute to DNR in the water treatment apparatus and around the paddy environment.