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Effects of Bio-sludge Concentration and Dilution Rate on the Efficiency of Sequencing Batch Reactor (SBR) System for Textile Wastewater Treatment

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Author(s): Suntud Sirianuntapiboon | Sarun Maneewon

Journal: EnvironmentAsia
ISSN 1906-1714

Volume: 5;
Issue: 2;
Start page: 36;
Date: 2012;
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Keywords: disperse dye | disperse blue 60 | disperse red 60 | Sequencing Batch Reactor (SBR) system | textile wastewater

ABSTRACT
The color removal efficiency of a sequencing batch reactor (SBR) system with synthetic textile wastewater (STWW) containing 80 mg/L disperse dye increased with the increase of mixed liquor suspended solids (MLSS) or solids retention time (SRT). The color removal efficiency was over 98% at an MLSS of 4,000 mg/L and SRT of over 25 days. Also, the color removal efficiency decreased with the increase of dye concentration. Both disperse blue 60 and disperse red 60 repressed the growths and activities of both heterotrophic and denitrifying bacteria, but they did not show any effect on nitrifying bacteria. However, the SBR system did not show any change in color removal efficiency of both disperse red 60 and disperse blue 60. The SBR system showed quite low color, COD and BOD5 removal efficiencies with raw textile wastewater (TWW). But, the system removal efficiencies could be increased by dilution of the TWW and supplementation with glucose. The color removal efficiency of the system with four times diluted-TWW containing 1.875 g/L glucose was 69.6±4.0%. Moreover, contaminated-NaCl in STWW could depress color adsorption yields of living as well as dead bio-sludge.
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