Experimental Analysis of the Aerobic stabilization Efficiency of an existing MBT plant

The management of the Municipal Solid Waste (MSW) has been strongly improved by the last Waste FrameworkDirective 2008/98/CE, by increasing the amount of waste materials that have to be reutilized, prepared for reutilizationand/or recycled. In any case, even if these goals will be achieved, a large amount of residual MSW from the SourceSegregated collection (SS) will need to be properly managed.Incineration is a quite suitable way for managing these materials even if it is costly and not homogenously spread in thedifferent European Areas.

Further Authors:
A. Sordi - LAR - Dipartimento di Ingegneria Industriale
C. Micale - LAR - Dipartimento di Ingegneria Industriale
G. Cirulli - LAR - Dipartimento di Ingegneria Industriale

Another diffused solution is represented by Mechanical Biological Treatment (MBT)facilities that can lead to some advantages as producing and high quality Solid Recovered Fuels (SRF) or reducing andstabilizing the mass of the waste to be disposed off. In particular, this last solution was the first exploited in MSWmanagement since many years ago. Currently many of these plants operate in quite different conditions related to thedesign one. The difference arises from the variation both in waste management strategies and in the waste rates treated.These differences can influence both the mechanical and the Biological Treatment (BT) sections of the facility leadingtom some modifications in plant efficiency. The present study analyses the BT section of an existing MBT facilityoperating the aerobic stabilization of the Waste Organic Fraction (WOF) produced by the mechanical screening of theMSW resulting from SS collection. This BT section is a continuous flow composting plant with an aerated flow throughwhich electrical fans provides the process air. The continuous flow is performed by a crane bridge with screw thatmoves on the basin area. The screws provide to stir and move ahead the WOF from the inlet to the outlet section.The analysis has been focused on the evaluation of the main WOF physical and biological activity features duringdifferent days of the treatment period. Different sampling points have been fixed on the basin area corresponding tospecific mean days of treatment. The stability achieved by the WOF in the different sampling points has been evaluatedby a Dynamic Respirometer Index (DRI) apparatus developed by the LARn of the University of Perugia, able toevaluate the oxygen uptake rate (mgO2/kgVSh) of the material.Main results show that the screws has a relevant influence on some process parameters as temperature, Volatile Solidsand Dynamic Respirometer Index potential. The continuous mixing effect combined with the continuous WOFintroduction in the basin, produces a temperature profile that in some cases is quite constant during the whole basinlength. Similarly for the VS concentration that seems not to vary significantly from the inlet to the outlet section.The high temperature level profiles combined with the amount of air injected beneath the WOF bed, causes a rapidhumidity reduction in the first days of the process that can lead to an inhibition of the aerobic bacteria activity. This isconfirmed by the VS concentration but also by the DRI values.The DRI potential of the WOF at the basin inlet is practically reduced in the first 25-50% meters of the basin length,remaining quite constant in the remaining part.Some improvement concerning process air regulation along with the possibility of increasing the WOF humidity ifbecomes to low, can lead to improve the stabilization process efficiency together with a reduction of the global Impact of the MBT process.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 8
Preis inkl. MwSt.: € 8,00
Autor: Prof-Ing. Francesco Di Maria
Dr. Moreno Marionni
F. Castellani

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