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<p>This study presents a novel, eco-friendly method for removing methyldiethanolamine (MDEA) from wastewater, addressing its environmental impact and elevated chemical oxygen demand (COD) from gas refineries. We employed two wetland plants, <i>Phragmites australis</i> and <i>Typha latifolia</i>, utilizing a hydroponics approach to assess MDEA removal efficiency. Wastewater samples from the Ilam gas refinery in Iran were tested at varying initial concentrations (50 to 1600&#xa0;ppm) over three consecutive 7-day periods, with a 1-day rest interval. Key factors influencing MDEA absorption—contact time, initial effluent concentration, and pH—were systematically analyzed. Results indicated a significant decrease in pH, COD, and MDEA concentration during the first four days. Kinetic modeling employed pseudo-first-order (PFO) and pseudo-second-order (PSO) models, alongside adsorption isotherms (Langmuir, Freundlich, Temkin, Dobinin–Radeshkovich, and Louis), to evaluate MDEA absorption capacity. The Langmuir isotherm best described the absorption characteristics of both plants. Maximum adsorption capacities were recorded for <i>P. australis</i> at 1.181, 2.018, and 3.77&#xa0;mg/L across the experimental periods, while <i>T. latifolia</i> showed values of 0.779, 1.099, and 2.99&#xa0;mg/L. Kinetic analysis favored the pseudo-second-order model for both species. Our findings suggest that <i>P. australis</i> is the more effective candidate for phytoremediation of MDEA in wastewater treatment applications.</p>

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Efficiency of Phragmites australis (Cav.) Trin. Ex Steud. and Typha latifolia L. in remediating methyldiethanolamine (MDEA) from Ilam gas refinery wastewater: Isotherm and kinetic studies

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Mohammad Davoud Ghasemi Azadkhani,
  • Naser Karimi,
  • Mostafa Keshavarz Moraveji

摘要

This study presents a novel, eco-friendly method for removing methyldiethanolamine (MDEA) from wastewater, addressing its environmental impact and elevated chemical oxygen demand (COD) from gas refineries. We employed two wetland plants, Phragmites australis and Typha latifolia, utilizing a hydroponics approach to assess MDEA removal efficiency. Wastewater samples from the Ilam gas refinery in Iran were tested at varying initial concentrations (50 to 1600 ppm) over three consecutive 7-day periods, with a 1-day rest interval. Key factors influencing MDEA absorption—contact time, initial effluent concentration, and pH—were systematically analyzed. Results indicated a significant decrease in pH, COD, and MDEA concentration during the first four days. Kinetic modeling employed pseudo-first-order (PFO) and pseudo-second-order (PSO) models, alongside adsorption isotherms (Langmuir, Freundlich, Temkin, Dobinin–Radeshkovich, and Louis), to evaluate MDEA absorption capacity. The Langmuir isotherm best described the absorption characteristics of both plants. Maximum adsorption capacities were recorded for P. australis at 1.181, 2.018, and 3.77 mg/L across the experimental periods, while T. latifolia showed values of 0.779, 1.099, and 2.99 mg/L. Kinetic analysis favored the pseudo-second-order model for both species. Our findings suggest that P. australis is the more effective candidate for phytoremediation of MDEA in wastewater treatment applications.