Optimization of landfill leachate treatment by microwave oxidation using the Taguchi method
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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.
KeywordsMicrowave Persulfate Chemical oxidation Landfill leachate Taguchi orthogonal array ANOVA
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.
- Go AW, Sutanto S, Tran-Nguyen PL, Ismadji S, Gunawan S, Ju YH (2014) Biodiesel production under subcritical solvent condition using subcritical water treated whole Jatropha curcas seed kernels and possible use of hydrolysates to grow Yarrowia lipolytica. Fuel 120:46–52. doi: 10.1016/j.fuel.2013.11.066 CrossRefGoogle Scholar
- Oloibiri V, Ufomba I, Chys M, Audenaert WT, Demeestere K, Van Hulle SW (2015) A comparative study on the efficiency of ozonation and coagulation–flocculation as pretreatment to activated carbon adsorption of biologically stabilized landfill leachate. Waste Manag 43:335–342. doi: 10.1016/j.wasman.2015.06.014 CrossRefGoogle Scholar
- Rahman K (2007) Studies on free radicals, antioxidants, and co-factors. Clin Interv Aging 2:219–236Google Scholar
- Taguchi G (1986) Introduction to quality engineering: designing quality into products and processes. Asian Productivity Organization, TokyoGoogle Scholar
- Tenório-Neto ET, Guilherme MR, Lima-Tenório MK, Scariot DB, Nakamura CV, Rubira AF, Kunita MH (2015) Synthesis and characterization of a pH-responsive poly (ethylene glycol)-based hydrogel: acid degradation, equilibrium swelling, and absorption kinetic characteristics. Colloid Polym Sci 239:3611–3622. doi: 10.1007/s00396-015-3744-z CrossRefGoogle Scholar
- Xie S, Ma Y, Strong PJ, Clarke WP (2015) Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: the effect of pH and associated mechanisms. J Hazard Mater 299:577–583. doi: 10.1016/j.jhazmat.2015.07.065 CrossRefGoogle Scholar