Older landfills may, however, be of greater
concern. Whilst post-Landfill Directive changes and the conse-
quences for HHW have yet to be examined, it would appear that the
requirements made will not provide any further mitigation of risks
than currently offered through engineered landfills and leachate
treatment. Despite rising landfill costs and taxes, incineration
remains financially the more expensive option, particularly if
incineration residues fail to meet the waste acceptance criteria. The
introduction of tighter regulations concerning the chemical content
of potentially hazardous consumer products may render HHW less
problematic. The risks associated the various HHW disposal tech-
niques and comparison with landfill to assess the impact of hazards
on the environment and human health require further evaluation.