LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Split dosing of H2O2 for enhancing recalcitrant organics removal from landfill leachate in the Fe0/H2O2 process: Degradation efficiency and mechanism

Photo by collab_media from unsplash

Abstract This study applied a simple but efficient hydrogen peroxide (H2O2) split-dosing strategy as part of a zero valent iron (Fe0)/H2O2 process to effectively remove refractory organics from landfill leachate.… Click to show full abstract

Abstract This study applied a simple but efficient hydrogen peroxide (H2O2) split-dosing strategy as part of a zero valent iron (Fe0)/H2O2 process to effectively remove refractory organics from landfill leachate. Results showed that both the traditional Fenton and Fe0/H2O2 processes produced comparable treatment results, but the Fe0/H2O2 process (advantageously) produced much less sludge. Furthermore, Fe0/H2O2 process using a split H2O2 dosing strategy removed refractory organics from landfill leachate better than using the same oxidant dosage in a single dose. Under optimized operating conditions (H2O2 dosage = 12 mL/L) that included four small sub-doses of H2O2, removal efficiencies of total organic carbon, light absorbance at 254 nm, and color number were 56.76%, 58.59% and 94.56%, respectively. In addition, humic-like substances as refractory organics in the leachate were almost completely removed by the improved Fe0/H2O2 process. Our results demonstrated that the split-dosing strategy substantially enhanced hydroxyl radical (•OH) production in the Fe0/H2O2 process. Overall, the catalytic mechanism of the unique Fe0/H2O2 process can be assigned to the homogeneous catalytic effect of Fe2+ from Fe0 leaching and the heterogenous catalytic effect of iron (hydro) oxides, both of which act on H2O2 to produce •OH. This study provides an efficient strategy that can enhance refractory organics removal efficiency for practical application of the Fe0/H2O2 process.

Keywords: landfill leachate; h2o2 process; fe0 h2o2; split dosing; h2o2

Journal Title: Separation and Purification Technology
Year Published: 2022

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.