The Chemical Compatibility of Sand–Attapulgite Cut-Off Walls for Landfills

Soil–bentonite cut-off walls have been widely used to control landfill pollution but they do not good chemical compatibility with leachate. Attapulgite can be substituted for bentonite in walls. However, little is known about the of attapulgite and This study experimentally investigated wall specimens organic inorganic contaminants found that a sand–attapulgite has contaminants. A CaCl2 solution was represent contaminants, oxygen demand (COD) as an indicator content. The hydraulic conductivity initially decreased then increased become approximately constant Ca2+ concentration increased. Changes COD were divided into decreasing stage (0–10,000 mg/L) (10,000–40,000 mg/L). increase or decrease by no more than one order magnitude. explained terms bound water content pore structure. An while macropore mesopore volume small wall. purpose this elucidate understanding interactions between results research are informative improving application, design, construction