Comparison of Degradation Efficacy and Bacterial Diversity between the A/O and Processes for Coking Wastewater Treatment
Publication: Journal of Environmental Engineering
Volume 144, Issue 6
Abstract
To evaluate two practical coking wastewater treatment systems, the removal efficacy of major pollutants was compared and bacterial profiles were analyzed using high-throughput sequencing. The A/O (anoxic/oxic) process (named as 1 system) used the activated sludge method, whereas the (oxic/anoxic/oxic) process (named as 2 system) adopted the biocontact oxidation method, and the latter added an oil-removal tank and a preaeration tank. The oil-removal tank removed 37.0% of the oil, and phenol and were decreased to 398 and , respectively. For the final effluent of the process, the concentrations of chemical oxygen demand (COD), volatile phenol, total nitrogen, and total were low at 121, 0.09, 45.1, and , respectively. The and tanks presented higher bacterial diversity and lower species richness than the 1-O tank; the most abundant phylum in five biological tanks were Proteobacteria; and Nitrospirae had high richness in the oxic tanks. The microbial diversity and principal component analysis (PCA) revealed that different biological treatment processes and operation modes have significant impacts on the microbial population and species richness. Nitrifying and denitrifying bacteria, such as Nitrosomonas, Nitrospira, Thauera, and Thiobacillus, were relatively abundant, contributing to nitrogen removal.
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Acknowledgments
This study was financially supported by Yunnan Applied Basic Research Projects (No. 2016FB093).
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 26, 2016
Accepted: Sep 29, 2017
Published online: Mar 23, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 23, 2018
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