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Evaluation of Groundwater Quality Characteristics around Uncontrolled Closed Valley Landfill  

Park, Joung-Ku (Department of Environmental Engineering, Andong National University)
Kim, Tae-Dong (Department of Environmental Engineering, Andong National University)
Choi, Dong Hyuk (Department of Environmental Engineering, Andong National University)
Lee, Jin-Yong (Department of Geology, Kangwon National University)
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.3, 2007 , pp. 75-80 More about this Journal
Abstract
This study evaluated groundwater quality around an uncontrolled landfill in W sity, Korea, which was monitored for about two years (2005-2006). Parameters of concern include redox-sensitive indicators such as pH, DO, EC, ORP, DOC (dissolved organic carbon), NH3, NO3 and SO4. About 10 years have elapsed after closing dumping of municipal wastes in the landfill. Leachates showed widely varying concentrations in COD(136${\sim}$263 mg/L), T-N(121${\sim}$186 mg/L), and NH3-N(14${\sim}$369 mg/L). Groundwater at the immediate downgradient of the landfill showed weakly acidic pH condition but very high levels of EC (3,000-4,000 ${\mu}S/cm$), which indicated that the groundwater was largely affected by the landfill leachate. Cl, a conservative ion, showed over 200 mg/L at the landfill border, but a gradually decreasing level with distance from the landfill, representing dispersion and dilution (natural attenuation) due to mixing with surrounding groundwater and replenished rainwater. Redox potential showed negative value at the landfill border but it increased up to 350 mV at downgradient wells, which indicated conversion of redox condition from reducing oxic ones. Ammonia, was largely enriched at most of the monitoring wells and its level greatly exceeded drinking water standard. In summary, all the parameters evidenced occurrence of natural attenuation with distance and with time but further monitoring is still required.
Keywords
Groundwater quality; Groundwater contamination; Leachate; Closed landfill;
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