2007 Volume 18 Issue 5 Pages 325-334
The leachate samples from 22 landfill sites for municipal solid waste (MSW) in Saitama prefecture were analyzed for 46 parameters in the years 2000 and 2005. Five parameters (pH, Cd, Pb, BOD and Fe) exceeded the standard values set by the government for final effluent. The correlation analysis for these 46 parameters showed high correlation coefficients among the organic parameters of BOD, COD, TOC and volatile fatty acids (VFA), and among the inorganic parameters of EC, Na, K, Ca and Cl-. The principal component analysis for these nine parameters showed that the primary component represented the total amount of chemical substances and the secondary component represented the organic or inorganic nature of the leachate, and that these two components were applicable to the classification of the surveyed landfill sites. In addition, in the landfill sites for MSW that accept mainly incineration residue, it become clear that the EC value can be applied to monitor the fate of BOD in the leachate after landfill input has stopped and to predict the occurrence of high concentrations of heavy metals like Pb in the leachate of a specific landfill site.
