Journal
ENVIRONMENTAL TECHNOLOGY
Volume 32, Issue 9, Pages 945-951Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2010.521953
Keywords
landfill leachate; UV-Fenton; UV-H2O2; COD removal; BOD5; COD
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Funding
- Ministry of Housing and Urban-Rural Development of the People's Republic of China [2009-K6-26]
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In this study, laboratory experiments were conducted to compare the efficacy of several H2O2-based advanced oxidation processes (AOPs): UV-Fenton, UV-H2O2, and Fenton reagent, to treat landfill leachate with the objective of removing COD and improving the leachate's overall biodegradability (evaluated in terms of BOD5/COD ratio). The results indicated that, at optimized experimental conditions of 25 degrees C, pH 4.0, 4000 mg L-1 H2O2, 30 mg L-1 Fe(II) (for UV-Fenton and Fenton ) and 60 min reaction time, the UV-Fenton system showed the highest COD removal. The COD removal rate in the H2O2-based AOPs was strongly dependent on the concentration of H2O2 and the pH value. Temperature had little effect on overall COD removal rate in the Fenton and Fenton-like systems. All three systems would result in a significant increase in the ratio of BOD5/COD, from 0.17 to about 0.60, at the applied H2O2 dosage of 4000 mg L-1. The increase in biodegradability of the AOP leachate indicates that these AOPs would be beneficial for the subsequent biological treatment process. The UV-Fenton process was found to be the most effective approach of these H2O2-based AOPs to enhance the biodegradability and eliminate the colour of the leachate.
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