3.5. Removal of ammoniacal-nitrogen under optimized conditions
The ammoniacal nitrogen concentration of the raw leachate is
2040 mg/L (mean value), as presented in Table 1. Ammoniacal
nitrogen in leachate may last for several decades and is a result of
slow leaching and the release of soluble nitrogen from solid waste
in landfills (Aziz et al., 2004). From Fig. 7, the removal efficiency of
ammoniacal nitrogen using the alum coagulant was 47.6%, while
41.2% was removed using the lateritic soil as a coagulant under