Optimization of microwave-enhanced oxidation of landfill leachate by response surface methodology
Journal
DESALINATION AND WATER TREATMENT
Journal Volume
191
Pages
350-361
Date Issued
2020
Author(s)
Abstract
Raw landfill leachate was treated using an enhanced microwave oxidation process for removals of total organic carbon (TOC), color, and organic compounds with double bonds (UV254 ). Experimental factors, microwave (MW) power setting, reaction time, and initial persulfate (PS) concentration, were optimized via response surface methodology (RSM) with a Box–Behnken design. The analysis of variance was used to derive the prediction correlation coefficient and the relationship of each factor on the test parameters. The contour-line plots and surface plots revealed the optimal operating conditions for removals of three parameters. The initial PS concentration had the most sig-nificant effect on the removals of all three parameters. The highest removals of 79.5%, 100%, and 68.4% for TOC, color, and UV254 attained under separate optimal operating conditions, respectively. The optimal operating conditions for TOC, color, and UV254 removals as a whole were derived to be 447.7 W, 20.0 mM, and 116.3 min with removals of 78.8%, 100%, and 66.4%, respectively.
Type
journal article