Abstract:
The study concerned on the effect of sodium chloride concentration on the dyes adsorption capacity of resting and autoclaved
bio-sludges. The treatment of synthetic wastewater (SWW) containing disperse red 60 and disperse blue 60 and textile wastewater
by SBR system under various MLSS of 1,000-5,000 mg/l under HRT of 5 days was investigated. The effect of mixed disperse
dyes concentration on the efficiency of SBR system was also studied.
The results showed that both disperse dyes were more easily adsorbed on the resting bio-sludge than autoclaved bio-sludge in
SWW containing sodium chloride. The SBR system under 3,000 mg/l MLSS showed the highest COD, BOD5, TKN and disperse
blue 60 of 91.5?0.4, 97.2?0.1, 84.7?1.5 and 95.5?1.0%, respectively with SWW containing 80 mg/l disperse blue 60. It was also
showed the highest COD, BOD5, TKN and disperse red 60 of 95.3?0.6, 96.7?0.5, 85.3?1.4 and 96.0?0.8%, respectively with
SWW containing 80 mg/l disperse red 60. The mixed disperse dyes in SWW were also effected to the efficiency of SBR system.
The removal efficiency of SBR system was decreased when the mixed dyes were increased up to 160 mg/l. However, the dyes
concentration did not effect to BOD5 and TKN removal efficiency of SBR system.
SBR system with textile wastewater showed very low removal efficiency. But the efficiency could be increased by adding glucose
into wastewater. The system with 25% diluted textile wastewater containing glucose to adjust the final BOD5 of 1,000 mg/l showed
the highest COD, BOD5, TKN and dye removal efficiencies of 88.3?2.6, 94.4?2.4, 82.8?6.8 and 69.6?4.0 %, respectively.