Application of a modified Fenton method for landfill leachate treatment – a case study

Résumé fourni par la source

ABSTRACT The study analyzed the effect of modification of the dosing method of reagents in the Fenton process and the effect of sequential dosing on the reduction of impurities in leachates. Leachate samples were collected from a landfill in Janczyce (Świętokrzyskie Voivodeship), which is a part of the municipal waste disposal plant in Janczyce. Tests were carried out at the initial process pH value of 4 (correction with concentrated H 2 SO 4 ) for various doses of Fe 2+ catalyst (Fe 2+ dose within the range of 600–1,400 mg L –1 ) at 20°C ± 1°C. The effect of oxidant dosing was investigated in different configurations for Fe 2+ relations: H 2 O 2 ratio of 1:8. Prior to and following the treatment process, the values of inter alia chemical oxygen demand (COD), total organic carbon (TOC), and selected elements including heavy metals in the leachate were studied. The maximum decrease in the COD indicator was as much as 81.1%, and was obtained in the series for which the conventional Fenton process excluding the sequential dosing at a H 2 O 2 dose of 8,000 mg H 2 O 2 L –1 was run. The maximum decrease in the TOC indicator was as much as 72.6% for 11,200 mg H 2 O 2 L –1 . This time, however, a better result was noted for the series in which the modification was implemented by means of hydrogen peroxide sequencing dosing. It was demonstrated that oxidant sequencing at a constant catalyst dose results in substantial improvement in elimination of TOC in treated leachate samples compared with the results obtained for the reference sample. Significant increase in electrolytic conductivity or improvement in heavy metal removal were not observed.

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