... liners or geotesynthetic liners. Clay is also used as a liner because of its ability to attenuate pollutants such as metals (Yong & Sheremaya 1991). By choosing a suitable liners material and engineering it to suitable standards on site, the migration or seepage of leachate can be kept within environmental acceptable limit. Swelling clays such as those from the smectite group have been the preferred clay minerals use in mineral liners. Elliott and Watkins (1997) reported that Kaolinite - containing clay has distinct advantage over smectite containing clays when used as landfill lining system. A numbers of researches (Quigley et al., 1988; Anderson, 1982; Acar & Seals, 1984; Acar & Field, 1984a; Anderson & Jones, 1983; Yanful et al.,1990;) have been devoted to the investigation of the use of clay soils as landfill liners. Daniel & Liljestrand (1984); Joseph et all., (2003) both reported that different leachates have distinct effects on ...

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