Biodegradation of TCP in a Sequencing Batch-Fluidized Bed Bioreactor with Waste Coke Particles as the Carrier
Publication: Journal of Environmental Engineering
Volume 139, Issue 9
Abstract
This study investigated the biodegradation of synthetic wastewater containing 2,4,6-trichlorophenol (TCP) in a sequencing batch-fluidized bed bioreactor (SBFBBR) with waste coke particles (WCPs) as the biofilm carrier. The irregular surfaces of WCPs (diameter range from 0.6 to 2.3 mm) rendered them ideal biomass carriers. The attached biomass was 4.0–4.5 mg volatile suspended solids WCPs 3 weeks after reactor start-up, and the biofilm thicknesses were 35–110 μm. Biodegradation, not adsorption-degradation or volatilization-degradation, was found to be the main TCP removal mechanism. At the initial chemical oxygen demand (COD) concentration of , removal of COD was more efficient and faster than that of TCP. The air-water ratio (ranging from 0.280 to ) exerted negligible effects at dissolved oxygen (DO) concentrations above . Maximum TCP degradation (62.1% after 3 h retention time and 75.8% after 6 h) occurred at initial COD concentration of . TCP can be removed by biofilm as a sole source of carbon and energy. Furthermore, the TCP biodegradation follows zero-order reaction kinetics, with the zero-order specific biodegradation rate dependent on initial COD concentration.
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Acknowledgments
This research was supported by the National Science and Technology Pillar Program of China (2009BAA20B02) and Zhejiang Province Environmental Pollution Control Technology Research Laboratory (D1091105).
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Published In
Journal of Environmental Engineering
Volume 139 • Issue 9 • September 2013
Pages: 1222 - 1227
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 12, 2012
Accepted: Apr 23, 2013
Published online: Apr 25, 2013
Published in print: Sep 1, 2013
Discussion open until: Sep 25, 2013
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