上海老港填埋垃圾场渗滤液COD与UVA的相互关系

本实验研究对象为上海老港填埋场1991年填埋单元渗滤液和各处理工艺出水渗滤液，水样经过不同孔径膜微滤和超滤后，比较了各自COD值和UVA值之间的相关性．结果表明，水样COD浓度愈低，与其对应的UVA相关性愈好．由于有机物的组成不同，对应的特征吸收范围存在差别，因此，不同渗滤液的UVA与COD的关系也不同．渗滤液中的胶体物质对COD值有贡献，微滤和超滤系统使渗滤液中的胶体物质被截留，COD值减小，测定得到对应的UVA值也相应减小．

RELATIONSHIP BETWEEN COD VALUES IN LEACHATE IN SHANGHAI LANDFILL AND THEIR UV ABSORBANCE

In this work the relationship between COD and UV absorbance for leachate are explored under different conditions,aiming to understand the 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 separated using membranes with various porosity.It is found that the lower COD values in leachate,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.