DECOLORIZATION OF DYING TEXTILE WASTEWATER BY ADVANCED ACTIVATEDD SLUDGE IN A SEQUENCING BATCH REACTOR.

The decolorization capacity of three single-grown white rot fungi, Phanerochaete chrysosporium, Trametes versicolor and Pleurotus sajur-caju, for an original textile wastewater was investigated. In experimental studies, to a sequencing batch reactor (SBR) fungal biomass was added during the beginning of reaction phase, and it was operated to obtain advanced activated sludge. At the end of the 1.5-h of reaction and 1.5-h of settling phases, increasing of decolorization efficiencies 67-77% at 436 nm, 64- 79% at 525 nm, and 69-76% at 620 nm from 0 (zero) to 1600 mm residence time were observed for P. chrysosporium, where-as those of T versicolor were 71-84% at 436 nm, 72-85% at 525 nm and 70-80% at 620 nm, and for P. sajur-caju 74-80% at 436 nm, 75-81% at 525 nm and 72-78% at 620 nm, under the same residence times. Major decolorization rates (at 525 nm), 75 and 85%, were obtained by T. versicolor at 30 mm and 1600 mm, respectively. The average decolorization efficiency was approx. 80%. Results suggested. that advanced activated sludge exhibited a capacity to decolorize the original effluent of dying textile wastewater within 3 hour additionally 30 mm. Therefore, the optimum operation time for the advanced activated sludge system can be chosen to be 4 hours. [ABSTRACT FROM AUTHOR]