Optimization for simultaneous removal of NH3-N and COD from coking wastewater via a three-dimensional electrode system with coal-based electrode materials by RSM method

Su Ting; Gao Wenwen; Xing Xiangdong; Lan Xinzhe; Song Yonghui

doi:10.1515/gps-2021-0072

Green Processing and Synthesis (Nov 2021)

Optimization for simultaneous removal of NH3-N and COD from coking wastewater via a three-dimensional electrode system with coal-based electrode materials by RSM method

Su Ting,
Gao Wenwen,
Xing Xiangdong,
Lan Xinzhe,
Song Yonghui

Affiliations

Su Ting: School of Chemistry and Chemical Engineering, Yulin University, Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, Yulin, 719000, China
Gao Wenwen: School of Chemistry and Chemical Engineering, Yulin University, Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, Yulin, 719000, China
Xing Xiangdong: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Key Laboratory of Gold and Resources of Shaanxi Province, Xi’an, 710055, China
Lan Xinzhe: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Key Laboratory of Gold and Resources of Shaanxi Province, Xi’an, 710055, China
Song Yonghui: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Key Laboratory of Gold and Resources of Shaanxi Province, Xi’an, 710055, China

DOI: https://doi.org/10.1515/gps-2021-0072
Journal volume & issue: Vol. 10, no. 1
pp. 756 – 767

Abstract

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The present work demonstrated preparation of coal-based electrode materials (CEM)-derived low-rank coal for simultaneous removal of ammonia nitrogen (NH3-N) and chemical oxygen demand (COD) from coking wastewater by a three-dimensional electrode system (3DES). The influence of important parameters in 3DES such as processing time, applied voltage, electrode plate spacing, mass of commercially activated carbon (CAC), and initial pH were investigated. Based on the central composite design, the response surface method (RSM) was employed in order to optimize the variable parameters in removal process of pollutants. From the analysis of RSM, the optimum conditions for 3DES were 4.5 h of processing time, 5.5 V of applied voltage, 17 mm electrode plate spacing, 4.5 g CAC, and pH of 3 with higher simultaneous removal rate of COD (74.20%) and NH3-N (51.48%). Besides, the content of N element (4.9%) and N containing groups were traced by SEM-EDS and FTIR analysis in order to verify the removal effect. The experiment results showed the capability of CEM for electrode system removal of pollutants from coking wastewater and obtained considerable simultaneous removal rate of NH3-N and COD.

Published in Green Processing and Synthesis

ISSN: 2191-9542 (Print); 2191-9550 (Online)
Publisher: De Gruyter
Country of publisher: Poland
LCC subjects: Science: Chemistry
Website: https://www.degruyter.com/view/j/gps

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