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Optimization of landfill leachate treatment by microwave oxidation using the Taguchi method

  • C.-J. Yeh
  • S.-L. Lo
  • J. Kuo
  • Y.-C. Chou
Original Paper
  • 128 Downloads

Abstract

Landfill leachate issue in Taiwan was often to be concerned for its treatment technology, effects, and costs. An experimental study using microwave oxidation process to treat leachate was designed and optimized using Taguchi L16 orthogonal array (OA) design, coupled with the signal-to-noise (S/N) ratio method and the analysis of variance (ANOVA) method, and compared the relationships between them. Three experimental factors, microwave (MW) power settings, persulfate (PS) doses, and MW irradiation time (T), as well as three target parameters, total organic carbon (TOC), color, and UV254, were studied. The optimal conditions were found to be: 550 W, 1 M, and 120 min for TOC removals of 80% and color removals of 96%; 775 W, 1 M, and 120 min for UV254 removals of 55%. The ranking of significance of experimental factors was: MW > PS > T for TOC removals, PS > MW > T for color removals, and MW > PS > T for UV254 removals. The quality loss function values were used to compare the quality loss situation among different experimental conditions in the Taguchi OA design. The predicted removals of target parameters under the optimal conditions by Taguchi method and ANOVA were similar to the actual results from the confirmation experimental runs.

Graphical Abstract

Keywords

Microwave Persulfate Chemical oxidation Landfill leachate Taguchi orthogonal array ANOVA 

Notes

Acknowledgements

The UV–Vis spectrophotometer and the TOC analyzer were provided by Department of Water Resources and Environmental Engineering, Tamkang University. We would like to thank Professors Chi Wang Li, Shyh Fang Kang, and Tau Being Hsu for their valuable comments and assistance.

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Copyright information

© Islamic Azad University (IAU) 2017

Authors and Affiliations

  1. 1.Graduate Institute of Environmental EngineeringNational Taiwan UniversityTaipeiTaiwan, ROC
  2. 2.Department of Civil and Environmental EngineeringCalifornia State UniversityFullertonUSA

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