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http://dx.doi.org/10.7857/JSGE.2021.26.1.024

Long Term Affecting Factors on Major Water Quality Items of Landfill Leachate  

Chun, Seung-Kyu (Graduate School of Energy & Environment, Seoul National University of Science & Technology)
Kim, Min Hyuk (Water Environmental Management Division, SUDOKWON Landfill Site Management Corporation)
Won, Jong Chul (Water Environmental Management Division, SUDOKWON Landfill Site Management Corporation)
Publication Information
Journal of Soil and Groundwater Environment / v.26, no.1, 2021 , pp. 24-33 More about this Journal
Abstract
Analysis of long term affecting factors on water quality items of gas emission form (BOD, COD) and leachate emission form (T-N, non-bio-degradable COD (NBDCOD)) was performed for the SUDOKWON 1st Landfill Site (LS1) and 2nd Landfill Site (LS2). As landfill gas was generated, BOD and COD decreased from 6,887 and 20,025 mg/L in 1993 to 49.5 and 670.2 mg/L in 2019, respectively. TN and NBDCOD increased with waste decomposition but gradually decreased after landfill closure because of the precipitation infiltration effect. Due to the drastic decline of carbon in the leachate, the BOD/TN ratios of LS1 and LS2 declined from 13.0 and 17.0 during early stage of the landfill to 0.07 and 0.16 in 2019, respectively; LS2 and NBDCOD/COD increased from 0.25 to 0.65 during the same period. These conditions caused carbon deficiency in denitrification treatment and a chemical post-treatment request for NBDCOD. The different behaviors of gas emission and leachate emission items suggest the necessity of different strategic approaches in the long term perspective.
Keywords
Leachate; Landfill gas; BOD; COD; T-N;
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