Experimental Characterization Of Municipal
Solid Waste Bio-drying
Author(s)
E. C. Rada, M. Ragazzi, V. Panaitescu & T. Apostol
Abstract
The bio-mechanical treatment of Municipal Solid Waste (MSW) has been
adopted in Europe either as a pre-treatment before landfilling or as a pretreatment
before combustion. In this frame, the bio-drying process concerns the
aerobic bioconversion applied mainly to MSW residual of selective collection.
The aim of this process is the exploitation of the biochemical exothermic
reactions for the evaporation of the highest amount of the humidity in the waste,
with the lowest consumption of organic carbon. The obtained material can be
easily refined to produce Refuse Derived Fuel. The present paper reports original
assessments of process parameters characterizing the MSW bio-drying. In
particular, outputs of a few pilot scale experimental runs have been elaborated in
order to assess the following overall process parameters: m3
AIR kg-1 of waste,
m3
AIR kg-1 of consumed volatile solids, m3
AIR kg-1 of initial volatile solids,
m3
AIR kg-1 of organic fraction in the waste. Additionally, the assessed volatile
solid dynamics during the bio-drying process are presented. These data are not
generally available in the literature. Concerning the organic fraction contents in
the waste suitable for bio-drying, usually its application is in the range of about
30-50%. The reasons are: a) lower values can give limited results in term of
Lower Heating Value (LHV) increase of the bio-dried material; b) the
application to waste with higher organic fraction content has the limitation of
starting with very low LHV affecting the final characteristics of the bio-dried
material. In this organic fraction range the air flow-rate is significant: it can vary
between 6 and 10 m3/kgMSW that is similar to the off-gas generable from the
incineration of the same waste.
Keywords: bio-drying, design, energy, MSW, pre-treatment.
Keywords
bio-drying, design, energy, MSW, pre-treatment.
Related Book
Other papers in this volume
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