| Title |
Effects of Hydraulic Retention Time and Ammonia Nitrogen Concentration on the Biological Treatment of Leachate |
| Authors |
배재호 ; 조광명 ; 박수영 ; 맹성민 ; 송기봉 ( Jae Ho Bae ; Kwang Meyung Cho ; Soo Young Park ; Sung Min Maeng ; Ki Bong Song ) |
| Abstract |
The treatment of leachate from solid wastes landfill is generally difficult because it contains high concentrations of organics, ammonia nitrogen and ionic materials. Experiments were conducted to characterize the leachate generated from Kimpo Landfill Site and to investigate the effects of hydraulic retention time and ammonia nitrogen concentration on the efficiency of the leachate treatment system consisted of anaerobic digestion and extended aeration processes. The leachate was characterized for three months after eighteen months of landfill operations, and CODcr, COD_(mn), BOD, TDS, and NH₄^+ -N were stable with the average values of 3,960㎎/ℓ, 920㎎/ℓ, 3,430㎎/ℓ, 14,230㎎/ℓ, and 1,090㎎/ℓ, respectively. For anaerobic digestion of the leachate, the hydraulic retention time was found to be a critical factor for the operation, and should be maintained longer than 20 days without significant changes in flow rate. The high concentrations of NH₄^+-N and ionic materials in the leachate appeared not to significantly affect the treatment efficiency. However, for the extended aeration process which receives the anaerobic digester effluent, the hydraulic retention time appeared not to affect the organic removal efficiency. Effects of the high concentrations of NH₄^+-N and ionic materials on extended aeration process were negligible over a long term, but a longer adaptation period was required with those compounds. |