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In this study, waste landfill site was used as a bioreactor landfill for the treatment of anaerobically digested food wastewater, and a basic study on waste landfill injection of anaerobically digested food wastewater was conducted. To study the effect of different operating condition on the quality of lysimeter leachate, 3 lysimeters were operated at different condition (i.e., Lys 1 = no recirculation, Lys 2 = leachate recirculation, Lys 3 = leachate recirculation after one day aeration), and the results of leachate quality were as followings. pH Level of leachate became similar to the digested food wastewater after 63 days of operation(equivalent to the 11.2% of bed volume) and Cl- concentration of leachate was higher than injected food wastewater during whole 6 months of operation period. Leachate COD showed stable values after 70 days of operation, and reduction rate of COD concentration after 6 months was 86%, 89, and 90% for Lys 1, Lys 2, and Lys 3, respectively. The reduction rates of TKN concentration were 19, 28, and 65% for Lys 1, Lys 2, and Lys 3. Lys 3 showed the most effective TKN reduction. Leachate recirculation after one day aeration resulted effective reduction of cumulative COD and TKN mass, which were 61% and 40% respectively, compared to the no recirculation case.

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