Post-tanning wastewater treatment using electrocoagulation: Optimization, kinetics, and settlement analysis

被引：12
作者：
Villaseñor-Basulto D.L. [1 ]
Kadier A. [2 ,3 ]
Singh R. [4 ]
Navarro-Mendoza R. [1 ]
Bandala E. [5 ]
Peralta-Hernández J.M. [1 ]
机构：
[1] Departamento de Química, DCNE, Universidad de Guanajuato, Cerro de la Venada s/n, Pueblito de Rocha, 36040, Guanajuato, Guanajuato
[2] Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi
[3] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing
[4] Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida, Gainesville, FL
[5] Division of Hydrologic Sciences, Desert Research Institute, 755 E. Flamingo Road, Las Vegas, 89119–7363, NV
来源：
Process Safety and Environmental Protection | 2022年 / 165卷
关键词：
Electrocoagulation; Post-tanning process; RSM; Sludge reuse; Steel-carbon electrodes;
D O I：
10.1016/j.psep.2022.08.008
中图分类号：
学科分类号：
摘要：
Post-tanning process in the tannery industry generates complex wastewater. Continuous electrocoagulation (EC) with carbon-steel electrodes was used to treat synthetic/post-tanning wastewater. Research surface methodology, based on central composite design (RSM-CCD), was used for variables optimization and analysis of variance (ANOVA) to relate all parameters. Optimal variables were identified as initial pH 3.0, current density 6.4 mA m−2, initial dye concentration 125 mg L−1, NaCl concentration 1000 mg L−1, and inlet flow rate 176 mL min−1 to produce 71% dye removal, operational costs (OC) 0.05 US$ m−3, power consumption 1.3 kWh m−3, iron consumption 0.05 kg m−3, dye removal capacity per dissolved mg iron (qe) 4.3 mg Dye L−1 C−1 and total dissolved solids (TDS) removal 43.5%. Best process conditions were used to treat real post-tanning wastewater and resulted in carbon oxygen demand (COD) and TDS abatement (23% and 76%, respectively), as well as low OC (0.84 US$ m−3) and energy consumption (20.6 kWh m−3). Pseudo-first-order kinetic model was found fitting experimental results, having electrical energy per order (EEO) of 1 kW h m−1 order−1 with a higher k = 1.14 min−1. Scanning electron microscopy analysis suggested the presence of iron nanoparticles within the sludge. All input and output parameters resulted in statistically significant where TDS and qe were the most valued for effective pollutant removal optimization and prevention of TDS increase in treated water. The outcomes of this study suggest EC as a suitable treatment for post-tanning wastewater and further knowledge of steel-carbon EC reactor design and sludge reusing purposes. © 2022 The Institution of Chemical Engineers
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页码：872 / 886
页数：14
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