Municipal Solid Waste Pre-treatment:
A Comparison Between Two Dewatering Options
Author(s)
M. Ragazzi, E. C. Rada, V. Panaitescu & T. Apostol
Abstract
In the field of Municipal Solid Waste (MSW) management, dewatering before
combustion is adopted in particular cases. The aim is the modification of the
waste characteristics in order to increase its LHV and allow an easier removal of
glass, metals and other inert material. The process is named bio-drying when it is
based on biological aerobic reactions; no auxiliary fuel is needed thanks to the
exothermic reactions that develop under aerobic conditions. About 2.5 million
tMSW/y will be bio-dried in 2006 when all the bio-drying plants under
construction will be completed. When the process is based on an external supply
of heat (generally obtained from auxiliary fuel), the option is named thermal
drying. This is well developed for sewage sludge but less for MSW. In Italy we
can find a few experiences of thermal drying on the oversieve from MSW
automatic sorting. In this case the aim is the decrease of humidity for the
production of Refuse Derived Fuel (RDF) as, according to the Italian regulation,
the highest value of humidity for RDF is 25%. A few proposals of thermal
drying have been proposed as a pre-treatment before combustion in two Italian
towns where an incinerator has been planned. In both cases the proposal is
integrated with the combustor (in order to use a part of the heat of the off-gases)
and the aim is the preparation of the waste to an easier inert, glass and metals
removal (for material recycling and for decreasing the impact of the
incineration). The present paper shows a comparison between bio-drying and
thermal drying taking into account MSW characteristics, environmental aspects,
energy balances and costs. An additional comparison concerns the role of
selective collection of biodegradable fraction in order to decrease the humidity of
the residual MSW.
Keywords: bio-drying, dewatering, MSW, thermal drying.
Keywords
bio-drying, dewatering, MSW, thermal drying.
Related Book
Other papers in this volume
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