Effect of an azo dye on the performance of an aerobic granular sludge sequencing batch reactor treating a simulated textile wastewater

Water Research
Rita D G FrancaNídia D Lourenço

Abstract

This study analyzed the effect of an azo dye (Acid Red 14) on the performance of an aerobic granular sludge (AGS) sequencing batch reactor (SBR) system operated with 6-h anaerobic-aerobic cycles for the treatment of a synthetic textile wastewater. In this sense, two SBRs inoculated with AGS from a domestic wastewater treatment plant were run in parallel, being one supplied with the dye and the other used as a dye-free control. The AGS successfully adapted to the new hydrodynamic conditions forming smaller, denser granules in both reactors, with optimal sludge volume index values of 19 and 17 mL g(-1) after 5-min and 30-min settling, respectively. As a result, high biomass concentration levels and sludge age values were registered, up to 13 gTSS L(-1) and 40 days, respectively, when deliberate biomass wastage was limited to the sampling needs. Stable dye removal yields above 90% were attained during the anaerobic reaction phase, confirmed by the formation of one of the aromatic amines arising from azo bond reduction. The control of the sludge retention time (SRT) to 15 days triggered a 30% reduction in the biodecolorization yield. However, the increase of the SRT values back to levels above 25 days reverted this effect and also ...Continue Reading

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Citations

Mar 15, 2016·Journal of Environmental Management·Shuang DengHaijia Su
Jan 11, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xia XuLiPing Wang
Dec 15, 2019·Environmental Science and Pollution Research International·Anu Mary Ealias, Manickam Puratchiveeran Saravanakumar
Sep 7, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·R D G FrancaN D Lourenço
Feb 25, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·María E LovatoCarlos A Martín
Sep 17, 2017·Applied Microbiology and Biotechnology·Haohao SunXu-Xiang Zhang
Aug 14, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jingang HuangJunhong Tang
Mar 20, 2018·Applied Microbiology and Biotechnology·Juntao XiaXu-Xiang Zhang
Feb 26, 2020·International Journal of Environmental Research and Public Health·Huiru LiChunping Yang
Dec 26, 2019·Journal of Hazardous Materials·Alfonz KedvesZoltán Kónya

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