Optimization of Organic Nitrogen Compounds Removal in Pymetrozine Production Wastewater Using Complex Extraction with Response-Surface Methodology
Publication: Journal of Environmental Engineering
Volume 146, Issue 7
Abstract
Production wastewater of pymetrozine leads to producing a lot of highly concentrated saline organic wastewater so that the related environmental aspects must be studied. In this study, a response surface methodology (RSM) was employed to investigate the effects of different operating conditions on the removal organic nitrogen compounds in pymetrozine production wastewater by a complex extraction with a mixed extractant containing di(2-ethylhexyl) phosphate and benzene. The Box-Behnken design (BBD) was used to optimize the extraction process and to evaluate the individual and interactions effects of the pH, diluent volume fraction, water to organic phase (W/O), temperature, and extraction time on organic nitrogen compounds removal. An optimized extraction efficiency of 78.91% from the RSM was obtained at a pH of 12.7, diluent volume fraction of 54.8%, W/O of 0.8, temperature of 24°C, extraction time of 35 min. Also, of HCl solution was used as stripping agent in the back extraction process. The back extraction efficiency of organic nitrogen compounds reached 88.9% when the W/O was and the extraction time was 15 min. An extractant after stripping can be repeatedly used by test verification.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Research Institute of Development of Chemical Resources along the Yangtze River and the Extraction Engineering Technological Research Center of Jiangsu Province.
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 7 • July 2020
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©2020 American Society of Civil Engineers.
History
Received: Oct 16, 2018
Accepted: Nov 12, 2019
Published online: May 12, 2020
Published in print: Jul 1, 2020
Discussion open until: Oct 12, 2020
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