PAEs and BPA removal in landfill leachate with Fenton process and its relationship with leachate DOM composition |
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Authors: | Pin-Jing He Zhong Zheng Hua Zhang Li-Ming Shao Qiong-Yao Tang |
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Affiliation: | State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, PR China |
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Abstract: | An increasing attention has been paid to the trace endocrine disrupting compounds (EDCs) in landfill leachate. In this paper, the removal of EDCs including phthalic acid esters (PAEs) and bisphenol A (BPA) from the fresh and mature landfill leachate by Fenton treatment was studied. More than 40% of PAEs and about 62% of BPA were removed from the raw mature leachate while only 20% of PAEs and 37% of BPA in the raw fresh leachate were reduced, respectively. After the fresh and mature leachates were spiked with PAEs to 1.5 mg L− 1 and BPA to 0.08 mg L− 1, the removal efficiencies of BPA and PAEs increased to more than 88%. The results indicated that the removing efficiencies of the EDCs in the leachate had a relationship with their concentrations, and that the trace levels of EDCs in leachate challenged the treatment capacity of the Fenton process. Most of the EDCs in the enriched leachate were removed by oxidation, which had no clear correlation with the hydrophobicity of the EDCs. The flocculation played an important role in the removal of di-(2-ethylhexyl) phthalate that could not be completely oxidized in the Fenton process, in that the EDCs with high n-octanol/water partition coefficient inclined to precipitate after the Fenton process. The dissolved organic matter (DOM) in the fresh leachate inhibited the EDCs removal more than the DOM in the mature leachate did. Both the composition of the leachate DOM and the characteristics of the EDCs determined the removing efficiencies of the EDCs in the Fenton process. |
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Keywords: | AOPs advanced oxidation processes BBP benzyl butyl phthalate BPA bisphenol A DEHP di-(2-ethylhexyl) phthalate DEP di-ethyl phthalate DIBP diisobutyl phthalate DMP di-methyl phthalate DnBP di-n-butyl phthalate DOM dissolved organic matter DOP di-octyl phthalate EDCs endocrine disrupting compounds EEM excitation emission matrix EF leachate enriched fresh leachate EM leachate enriched mature leachate sample Ex/Em excitation/emission MSW municipal solid waste MW molecular weight PAEs phthalic acid esters OF leachate un-enriched fresh leachate OM leachate un-enriched mature leachate |
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