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Advisor(s)
Abstract(s)
In order to fulfil European and Portuguese legal requirements, adequate alternatives to traditional municipal
waste landfilling must be found namely concerning organic wastes and others susceptible of valorisation.
According to the Portuguese Standard NP 4486:2008, refuse derived fuels (RDF) classification is based on
three main parameters: lower heating value (considered as an economic parameter), chlorine content
(considered as a technical parameter) and mercury content (considered as an environmental parameter).
The purpose of this study was to characterize the rejected streams resulting from the mechanical treatment
of unsorted municipal solid waste, from the plastic municipal selective collection and from the composting
process, in order to evaluate their potential as RDF. To accomplish this purpose six sampling campaigns
were performed. Chemical characterization comprised the proximate analysis – moisture content, volatile
matter, ashes and fixed carbon, as well as trace elements. Physical characterization was also done. To
evaluate their potential as RDF, the following parameters established in the Portuguese standard were also
evaluated: heating value and chlorine content. As expected, results show that the refused stream from
mechanical treatment is rather different from the selective collection rejected stream and from the rejected
from the compost screening in terms of moisture, energetic matter and ashes, as well as heating value and
chlorine. Preliminary data allows us to conclude that studied materials have a very interesting potential to
be used as RDF. In fact, the rejected from selective collection and the one from composting have a heating
value not very different from coal. Therefore, an important key factor may be the blending of these materials
with others of higher heating values, after pre-processing, in order to get fuel pellets with good consistency,
storage and handling characteristics and, therefore, combustion behavior.
Description
Keywords
Municipal Solid Wastes RDF
Citation
Bás, I., Silva, M. E., Lobo, G., Faria, M., & Lemos, L. T. de. (2016). Characterization of MSW rejected fractions to fulfill RDF requirements and utilization. Apresentado no International Congress on Water, Waste and Energy Management, Roma.