垃圾龄对填埋场好氧修复供氧和加速稳定化效果的影响

EVALUATION OF OXYGEN REQUIREMENT AND ACCELERATED PERFORMANCE OF STABILIZATION BY LANDFILL AERATION: EFFECT OF REFUSE AGE

填埋场好氧处理是一种有效的填埋场修复手段。采用模拟填埋反应器,搭配水气联合控制系统,探讨不同填埋龄垃圾好氧稳定化过程最佳氧气控制范围和污染物去除情况。结果表明新鲜垃圾和填埋龄分别为1,3,7年的垃圾最佳氧浓度调控范围分别为11%~14%、8%~14%、7%~15%和6%~17%。垃圾耗氧速率随填埋龄增加而降低。经过180~220 d的好氧处理,新鲜垃圾渗滤液BOD5和COD去除率均达到92%以上;而老龄垃圾渗滤液COD降解慢。处理后期各反应器ρ（BOD_5）/ρ（COD）〈0.1,垃圾基本稳定。

Landfill aeration was considered as a promising technology to remediate the old landfill sites. In this study,simulated landfill columns were constructed equipping with automatic control system for moisture and oxygen content,and the optimal oxygen range and accelerated performance of aerobic treatment for different age refuses were investigated. The results demonstrated that the oxygen range required was slightly different according to the refuse age： The optimal control ranges for fresh and aged refuse（ 1,3 and 7 years old） were 11% ~ 14% 、8% ~ 14% 、7% ~ 15% and 6% ~ 17%,respectively. The older the refuse was,the more slowly the oxygen was consumed. After 180 ~ 220 days of aerobic treatment,the total removal of BOD5 and COD in the leachate from fresh refuse were more than 92%; while,the decrease of leachate COD from aged refuses was relatively slow. After aeration,the characteristics of leachate from all the reactors were relatively stable with BOD5/ COD 0. 1,which were considered as a stabilization condition of refuses.