초록 열기/닫기 버튼
Analysis of long term affecting factors on water quality items of gas emission form (BOD, COD) and leachate emissionform (T-N, non-bio-degradable COD (NBDCOD)) was performed for the SUDOKWON 1st Landfill Site (LS1) and 2ndLandfill Site (LS2). As landfill gas was generated, BOD and COD decreased from 6,887 and 20,025 mg/L in 1993 to 49.5and 670.2 mg/L in 2019, respectively. TN and NBDCOD increased with waste decomposition but gradually decreasedafter landfill closure because of the precipitation infiltration effect. Due to the drastic decline of carbon in the leachate, theBOD/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 causedcarbon deficiency in denitrification treatment and a chemical post-treatment request for NBDCOD. The differentbehaviors of gas emission and leachate emission items suggest the necessity of different strategic approaches in the longterm perspective.
