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Innovative Technology of Landfill Stabilization Combining Leachate Recirculation with Shortcut Biological Nitrogen Removal Technology  

Shin, Eon-Bin (ERM Korea Ltd.)
Chung, Jin-Wook (Samsung Engineering Ltd.)
Bae, Woo-Keun (Department of Civil Engineering, Hanyang University)
Kim, Seung-Jin (Department of Civil Engineering, Hanyang University)
Baek, Seung-Cheon (Department of Civil Engineering, Hanyang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.9, 2007 , pp. 1035-1043 More about this Journal
Abstract
A leachate containing an elevated concentration of organic and inorganic compounds has the potential to contaminate adjacent soils and groundwater as well as downgradient areas of the watershed. Moreover high-strength ammonium concentrations in leachate can be toxic to aquatic ecological systems as well as consuming dissolved oxygen, due to ammonium oxidation, and thereby causing eutrophication of the watershed. In response to these concerns landfill stabilization and leachate treatment are required to reduce contaminant loading sand minimize effects on the environment. Compared with other treatment technologies, leachate recirculation technology is most effective for the pre-treatment of leachate and the acceleration of waste stabilization processes in a landfill. However, leachate recirculation that accelerates the decomposition of readily degradable organic matter might also be generating high-strength ammonium in the leachate. Since most landfill leachate having high concentrations of nitrogen also contain insufficient quantities of the organic carbon required for complete denitrification, we combined a shortcut biological nitrogen removal (SBNR) technology in order to solve the problem associated with the inability to denitrify the oxidized ammonium due to the lack of carbon sources. The accumulation of nitrite was successfully achieved at a 0.8 ratio of $NO_2^{-}-N/NO_x-N$ in an on-site reactor of the sequencing batch reactor (SBR) type that had operated for six hours in an aeration phase. The $NO_x$-N ratio in leachate produced following SBR treatment was reduced in the landfill and the denitrification mechanism is implied sulfur-based autotrophic denitrification and/or heterotrophic denitrification. The combined leachate recirculation with SBNR proved an effective technology for landfill stabilization and nitrogen removal in leachate.
Keywords
Landfill Stabilization; Leachate Recirculation; Shortcut Biological Nitrogen Removal (SBNR); Sulfate Reduction;
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