紫外吸光度与渗滤液COD浓度的关系研究

以上海老港填埋场1991年填埋单元渗滤液和各处理工艺出水渗滤液为对象，研究了各自的COD浓度值和对应的紫外吸光度之间的关系。结果表明，水样COD浓度值越低，COD值与对应吸光度之间的相关性越好。不同处理单元的渗滤液由于有机物组成差别较大，对应的特征吸收范围也各不相同。渗滤液中胶体物质对COD值有贡献，微滤和超滤系统使得渗滤液中胶体物质被截留，COD值减小，测定得到对应的吸光度值也相应减小。

On Relationship between COD Values in Leachate and their UV Absorbance in Various Conditions

In this paper the relationship between COD and UV absorbance for leachate is explored under different conditions so as to understand their chemical and physical properties. The leachate samples used are taken from the landfill compartments closed in 1991 and the effluents in the treatment facilities. Meanwhile, the colloidal particles in leachate are gradiently separarted using membranes with various porosity. It is found that the lower COD values in leachate are, the better correlation between COD values and UV absorbance is, and such a correlation should be established for each leachate due to the differentiation of chemical composition in different leachate. Both COD values and UV absorbance decrease as the colloids in leachate are separated by membranes. Hence, UV absorbance can be used as a potential index for COD in dilute leachate.