Seung-Kyu Chun1·Min Hyuk Kim2·Jong Chul Won2,*
1Graduate School of Energy & Environment, Seoul National University of Science & Technology, Seoul 01811, Korea
2Water Environmental Management Division, SUDOKWON Landfill Site Management Corporation, Incheon 22688, Korea
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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
2021; 26(1): 24-33
Published on Feb 28, 2021
Water Environmental Management Division, SUDOKWON Landfill Site Management Corporation, Incheon 22688, Korea