Treatment of Organic Wastewater Containing High Concentration of Sulfate by Crystallization-Fenton-SBR
Publication: Journal of Environmental Engineering
Volume 144, Issue 6
Abstract
In this study, a process consisting of cooling crystallization, Fenton reactions, and a sequencing batch reactor was investigated for the treatment of organic wastewater with high chemical oxygen demand (COD) and sulfate from a chemical company. Cooling crystallization was first employed to remove sulfate from the wastewater. At 4.0°C, sulfate concentration was reduced from 212 to , and total wastewater volume decreased by 49.1% through two-stage cooling crystallization. COD concentration was increased from 18.0 to due to the precipitation of crystals mainly containing crystal water. The effluent was then treated by Fenton reactions. At pH 2.0, of ferric/ferrous, of 30% , and a duration of reaction of 60 min, COD removal efficiency maximized at 77.9%, and COD concentration in the effluent leaving the Fenton reactions was . At last, the mixture of the effluent from the Fenton reactions and sewage at a volume ratio of was treated by a sequencing batch reactor (SBR) in which the microorganisms were acclimated to be sulfate tolerant. The efficiency of COD removal by the SBR steadily exceeded 85%, and COD concentration leaving the SBR was below . These data showed that the three-step process was cost-effective for the treatment of high-salt organic wastewater.
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Acknowledgments
This work was supported by the International S&T Cooperation Program of China (Project Contract No. 2015DFG92750), the National Natural Science Foundation of China (Grant No. 51478172), and the Department of Science and Technology of Hunan Province (Project Contract No. 2014GK1012).
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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: Aug 8, 2016
Accepted: Jan 5, 2018
Published online: Apr 11, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 11, 2018
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