准好氧填埋结构渗滤液CODCr衰减规律及模拟研究

建立模拟准好氧填埋场和厌氧填埋场中试试验装置(装置规模1.0 m×1.5 m×1.8 m)，并以后者做对照，对渗滤液ρ(COD_Cr)进行27周监测(每1～2周测1次)，研究模拟准好氧和厌氧填埋结构的不同层次空间和底部渗滤液ρ(COD_Cr)的时空变化规律及降解效果，对2种填埋结构渗滤液COD_Cr衰减规律原因及差异进行分析. 结果表明，准好氧填埋结构空间渗滤液ρ(COD_Cr)层次差异明显，呈现下层>中层>上层的规律，3层渗滤液ρ(COD_Cr)在前7周衰减幅度最大，之后表现为小幅度波动下降最后趋于稳定；在27周的监测时间里，准好氧填埋场空间和底部渗滤液ρ(COD_Cr)一直远低于厌氧填埋场对应层位，基本没有出现厌氧填埋场COD_Cr累积的现象. 对准好氧填埋场上、中、下层和底部渗滤液ρ(COD_Cr)的衰减规律进行数学拟合发现，27周的拟合曲线与实测数据曲线相关性较好，基本反映了COD_Cr的衰减规律. 

Study on the Attenuation Rules and Fitted Equations for Chemical Oxygen Demand of Semi-aerobic Landfill Leachate

Simulated semi-aerobic landfill equipment and anaerobic landfill equipment (CK) were installed with scale 1.0 m×1.5 m×1.8 m in order to investigate temporal and spatial change and degradation of leachate COD_Cr, and to explore the mechanism of COD_Cr decrease and the difference shown in two equipments. COD_Cr concentration was monitored for 27 weeks and measured once every 1～2 weeks. Theresults showed that leachate COD_Cr in semi-aerobic landfill equipment varied with spatial distribution, and showed under-layer > middle-layer > upper-layer. In the three layers, leachate COD_Cr mass concentration significantly decreased in the first 7 weeks; after that, COD_Cr mass concentration decreased with fluctuation and finally stabilized. During the whole monitoring period of 27 weeks, CODCr mass concentrations of spatial and bottom leachate in semi-aerobic landfill equipment were much lower than that in anaerobic landfill equipment, and little COD_Cr accumulation that often occurs in anaerobic landfill equipment was found. Theattenuation rules of the COD_Cr mass concentration in upper-layer, middle-layer,under-layer and bottom of semi-aerobic landfill leachate were fitted, and theresult showed that, during the 27 weeks, the fitted curves were well correlated with the measured curves and revealed the attenuation rule of COD_Cr in the semi-aerobic landfill equipment.