光依存性脱窒汚泥によるアゾ系酸性染料と窒素の連続処理

抄録

The development of effective and economical treatment of textile waste water is required. Simultaneous removal of dye and nitrogen by photo-dependent denitrifying sludge (PDDS), which has the potential to remove the color and nitrate nitrogen under denitrifying and lighting conditions, was developed. A successful continuous dye treatment system was demonstrated by bench-scale experiments. The optimal C/N ratio for the degradation of dyes by PDDS was determined to be 1.5: 1. The specific removal rate of Acid Blue 92 (AB-92) decreased with an increase in nitrate loading rate. And, the specific removal rate of AB-92 increased with a decrease in MLSS concentration. Bench scale treatment system which has nitrifying reactor and denitrifying reactor was constructed and its treatment capabilities were experimentally evaluated through continuous treatment of synthetic textile waste water. The nitrifying reactor in this system could nitrify the synthetic textile waste water which contains urea as organic nitrogen and several kinds of dyes. The denitrifying reactor could reduce the color intensity under light-denitrifying condition by PDDS.