Citation:
Hall, D.H.; Drury, D.; Gronow, J.R.; Rosevear, A.; Pollard, S.J.T.; Smith, R. Estimating Pollutant Removal Requirements for Landfills in the UK: II. Model Development, Environmental Technology, Vol 27, No 12, December 2006 , pp. 1323-1333
Abstract:
A modelling methodology using a leachate source term has been produced for
estimating the timescales for achieving environmental equilibrium status for
landfilled waste. Results are reported as the period of active management
required for modelled scenarios of non-flushed and flushed sites for a range of
pre-filling treatments. The base scenario against which results were evaluated
was raw municipal solid waste (MSW) for which only cadmium failed to reach
equilibrium. Flushed raw MSW met our criteria for stabilisation with active
leachate management for 40 years, subject to each of the leachate species being
present at or below their average UK concentrations. Stable non-reactive wastes,
meeting EU waste acceptance criteria, fared badly in the non-flushed scenario,
with only two species stabilising after a management period within 1000 years
and the majority requiring >2000 years of active leachate management. The
flushing scenarios showed only a marginal improvement, with arsenic still
persisting beyond 2000 years management even with an additional 500 mm y−1 of
infiltration. The stabilisation time for mechanically sorted organic residues
(without flushing) was high, and even with flushing, arsenic and chromium
appeared to remain a problem. Two mechanical biological treatment (MBT)
scenarios were examined, with medium and high intensity composting. Both were
subjected to the non-flushing and flushing scenarios. The non-flushing case of
both options fell short of the basic requirements of achieving equilibrium
within decades. The intense composting option with minimal flushing appeared to
create a scenario where equilibrium could be achieved. For incinerator bottom
ash (raw and subjected to various treatments), antimony, copper, chloride and
sulphate were the main controls on achieving equilibrium, irrespective of
treatment type. Flushing at higher flushing rates (500 mm y−1) failed to
demonstrate a significant reduction in the management period requi