Application of Ultrasonication and Hybrid Bioreactor for Treatment of Synthetic Textile Wastewater
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 21, Issue 2
Abstract
This study explores the influence of ultrasonic pretreatment on the performance of a hybrid bioreactor treating synthetic textile wastewater. The study primarily focuses on assessing the decolorization and chemical oxygen demand (COD) reduction efficiency of a hybrid bioreactor. The hybrid bioreactor provided anaerobic-aerobic sequential treatment to the ultrasonically pretreated textile wastewater containing two new generation diazo dyes namely, reactive black 5 (RB5) and reactive red (RR120), along with other chemical constituents. Ultrasonic pretreatment produced approximately 52% color and 48% COD reduction efficiency at an optimized power of 200 W and 180 min sonication time. For the hybrid reactor treating ultrasonically pretreated textile wastewater, a maximum of 98% COD and 92% color removal efficiencies were obtained at an HRT of 32 h [organic loading rate ] and 24 h (), respectively. Significant levels of aromatic amines formation were observed in the anaerobic phase. However, those were effectively eliminated in the subsequent aerobic phase inside the hybrid bioreactor. Volatile fatty acids to bicarbonate alkalinity (VFA/B-alk.) ratios, one of the health indicators of the bioreactor operation, were found in the range of 0.23–0.32 at different hydraulic retention times (HRTs), thus indicating the adequate buffering capacity for stability of the bioreactor. The study demonstrates the importance of ultrasonic pretreatment for mineralizing organic and inorganic impurities present in textile wastewater, which significantly improves the performance of subsequent hybrid bioreactor.
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Acknowledgments
The authors would like to acknowledge the financial support (SR/FTP/ETA-0045/2011) provided by Department of Science and Technology (DST), New Delhi, India and to the Department of Civil Engineering, School of Infrastructure, Indian Institute of Technology Bhubaneswar for providing facilities to carry out research works in the related area.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 21 • Issue 2 • April 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 2, 2016
Accepted: Jun 21, 2016
Published online: Aug 10, 2016
Discussion open until: Jan 10, 2017
Published in print: Apr 1, 2017
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