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Title: Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions
Authors: Tong, Huanhuan
Yin, Ke
Ge, Liya
Giannis, Apostolos
Wang, Jing-Yuan
Chuan, Valerie W.L.
Keywords: DRNTU::Engineering::Environmental engineering::Waste management
Issue Date: 2015
Source: Tong, H., Yin, K., Ge, L., Giannis, A., Chuan, V. W., & Wang, J. Y. (2015). Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions. Journal of hazardous materials, 287, 342-348.
Series/Report no.: Journal of hazardous materials
Abstract: The presence of humic substances (HS) in landfill leachate is of great interest because of their structural stability and potential toxicity. This study examined the effects of temperature and waste age on the transformation of HS during in situ aeration of bioreactor landfills. By establishing aerobic conditions, dissolved organic carbon (DOC) rapidly accumulated in the bioreactor leachate. Fractional analysis showed that the elevated concentration of humic acids (HAs) was primarily responsible for the increment of leachate strength. Further structural characterization indicated that the molecular weight (MW) and aromacity of HS were enhanced by aeration in conjunction with thermophilic temperature. Interestingly, elevation of HAs concentration was not observed in the aeration reactor with a prolonged waste age, as the mobility of HAs was lowered by the high MW derived from extended waste age. Based on these results, aeration may be more favorable in aged landfills, since dissolution of HAs could be minimized by the evolution to larger MW compared to young landfills. Moreover, increased operation temperature during aeration likely offers benefits for the rapid maturation of HS.
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2015.01.049
Rights: © 2015 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Hazardous Materials, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [ ].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
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