1992 年 28 巻 p. 139-149
Laboratory experiments using sequencing batch reactors have been carried out on the cases of both constant substrate feeds consisting of approx. 800mg and 400mg respectively of TOC supplied in a cycle, and varied substrate feeds consisting of either approx. 800mg and 400mg of TOC supplied continuous three times each in a day. The stoichiometry on the nitrified liquor re cycling process was studied from the behavior on carbon and nitrogen compounds variations during the biological treatment operation.
The stoichiometric equations for anoxic stage were proposed on the denitrification reaction with cell synthesis using the parameters of carbon atom (C) and hydrogen molecular (H2) as well as endogenousrespiration reaction using nitrate-ion (oxygen atom). It was found that these two reactionswere occurred simultaneously. The occurrence ratios of denitrification reaction to endogenousrespiration reaction were approx. 5.5 to 1 at the cases of higher and lower constant substratefeed tests and lower varied substrate feed series, while the reaction was approx. 2.9 to 1 atthe case of higher varied substrate feed series because of non-competitive inhibition in thedenitrification reaction. A stoichiometric equation for oxic stage was proposed on the nitrificationreaction with cell synthesis. It was found that this reaction was occurred with theendogenous respiration reaction simultaneously. The occurrence ratio of nitrification reaction toendogenous respiration reaction was approx. 12.5 to 1 at the cases of higher and lower constantsubstrate feed tests, while the ratio was approx. 15 to 1 at the case of lower varied substratefeed series.