Biodegradation of toluene diamine (TDA) in activated sludge acclimated with aniline and TDA.
The biodegradability of toluene diamine (TDA) which has been regarded as a "recalcitrant compound" was examined in activated sludges. In this study, a microorganic-enzyme system which metabolized TDA was obtained by acclimating the activated sludge with aniline and TDA. In the sludge subject to be 200 days' acclimation, the considerable increase in respiration rate with the addition of TDA, accompanied the sharp decrease in its concentration. This indicated that TDA was metabolized fortuitously. The rate of biodegradation of TDA in the absence of aniline was first order with respect to its concentration when the initial TDA concentration was less than about 5 mg/l. The rate constant in this relation was proportional to mixed liquor suspended solid (MLSS). However, when the initial TDA concentration exceeded 5 mg/l, the plots were deviated from a first order rate equation.
Asakura
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S
Department of Material Science and Chemical Engineering, Yokohama National University, Japan.
Okazaki
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S
D000814:Aniline Compounds / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D006868:Hydrolysis; D007220:Industrial Waste; D007700:Kinetics; D010101:Oxygen Consumption / Q000502:physiology; D010655:Phenylenediamines / Q000378:metabolism*; D014051:Toluene 2,4-Diisocyanate / Q000378:metabolism*; D014865:Waste Disposal, Fluid
D000814:Aniline Compounds; D007220:Industrial Waste; D010655:Phenylenediamines; D014051:Toluene 2,4-Diisocyanate; C010914:2,4-diaminotoluene; C023650:aniline