Abstract
The objective of this study is to evaluate the leaching reduction of heavy metals in leachate using carbonization residue of sewage sludge as a covering soil in landfill. From the results of batch experiment applying the Freundlich adsorption isotherms, the well-carbonized residue showed higher adsorption capacity than the partly-carbonized residue and covering soil. In continuous experiment to investigate the effect of the well-carbonization residue of sewage sludge on improvement of water quality and leaching reduction of heavy metals, 4-type columns (column1: waste only (incineration residue + sewage sludge) ; column2: waste + cover soil ; column3: waste + carbonization residue ; column4: waste + carbonization residue + cover soil) are prepared, monitored and compared the results each other. From the result of TOC, the leachate from column3 was in the lowest concentration; and/thus the accumulated concentration of heavy metals in leachate from column3 was lower than the other columns. As a result, it could be expected that using carbonization residue of sewage sludge as a covering soil would have a good effect on improvement of water quality
