Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11030036 | Process Safety and Environmental Protection | 2018 | 29 Pages |
Abstract
The removal of soluble organic matter from mature landfill leachate by means of biological, chemical, and combined biological-chemical methods was investigated in this study. Aerobic sequencing batch reactor (SBR) with activated sludge was used as the biological treatment to remove ammonium. The chemical treatments included ozone (O3), ozoneâ+âhydrogen peroxide (O3â+âH2O2), Fenton's reagents (H2O2â+âFe2+), and ozoneâ+âFenton's reagents (O3â+âH2O2â+âFe2+). Results indicated that the SBR achieved approximately 25% Chemical Oxygen Demand (COD) removal with an initial COD of 1276âmg/L. Ozonation of raw leachate achieved 16% COD removal after 240âmin of treatment while O3â+âH2O2 achieved 33% COD removal of raw leachate with 900âmg/L H2O2 in 120âmin. Moreover, Fenton's process also achieved 33% COD removal from raw leachate. Results suggest that the biological treatment followed by chemical treatments had the most efficient COD removal. After biological stabilization, ozonation removed 52% of the COD within 240âmin. The Fenton's process achieved 67% COD removal using equal doses of H2O2 and Fe2+. However, Fenton's reagents in conjunction with O3 removed 69% and 72% COD in 120âmin and 240âmin, respectively. The dosage test also revealed that the 2:1 ratio of H2O2 and Fe2+ had the best COD removal. Therefore, these results indicate that the combination of biological and post-chemical treatment methods effectively remove organic pollutants from mature landfill leachate.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
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Authors
Q. Xu, G. Siracusa, S. Di Gregorio, Q. Yuan,