A novel pretreatment process of mature landfill leachate with ultrasonic activated persulfate: Optimization using integrated Taguchi method and response surface methodology |
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| Institution: | 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;3. Hunan Xinruidi Environmental Protection and Garden Co., Ltd., Changsha 410007, China;4. Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85719, USA;1. Faculty of Caspian, College of Engineering, University of Tehran, Tehran, Iran;2. Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P.O. Box 11365/8486, Tehran, Iran;1. Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City) , New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt;2. Electronic Materials Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt;3. Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, 163 Horrya Avenue, P.O. Box 832, Shatby, 21526 Alexandria, Egypt |
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| Abstract: | A novel advanced oxidation process (AOP) using ultrasonic activated persulfate oxidation was used to pretreat mature landfill leachate. The effects of different operating variables (e.g., the initial S2O82? concentration, pH, temperature, ultrasonic power and reaction time) on the oxidation performance were investigated regarding the total organic carbon (TOC) removal efficiency, and the variables were optimized using the integrated Taguchi method and response surface methodology (RSM). Based on the Taguchi method under L16 (45) arrays and a grey relational analysis, the most significant variables included the initial S2O82? concentration, temperature and reaction time. The concentrations of these variables were further optimized using RSM. Using the integrated optimization method, the optimal conditions included an initial S2O82? concentration of 8.5 mM, a reaction temperature of 70 °C and a reaction time of 2.46 h, which resulted in a TOC removal efficiency of 77.32%. The experimental results showed that the enhanced TOC removal from mature landfill leachate by sono-activated persulfate oxidation could be attributed to the combined effects of ultrasonic catalysis and sulfate radical-AOP. Overall, ultrasonic activated persulfate oxidation is a promising method for the pretreatment of landfill leachate. |
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| Keywords: | Mature landfill leachate Optimization Persulfate Response surface methodology Taguchi method Ultrasonic |
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