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Quality evaluation and improvement of mechanically–biologically treated municipal solid waste in view of a possible recovery

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Abstract

This study aimed to identify possibilities to improve the quality of the stabilized biowaste coming from the mechanical–biological treatment of municipal solid waste produced in Rome for possible recovery rather than landfilling. The waste sampled before and after the first and the fourth week of aerobic biodegradation as well as different particle size classes composing the biostabilized materials were characterized in order to investigate the content and distribution of contaminants. Results showed, firstly, that the stabilized biowaste was not biologically stable after 4 weeks of biostabilization process, presenting dynamic respiration index >1,000 mg O2 kg VS−1 h−1. Heavy metal (Cd, Cr, Cu, Ni, Pb, Zn) content fulfilled the requirements for utilization, but by contrast, their release in water phase was quite high and not complying with Italian regulatory limits for waste recovery. In order to raise the quality, the biological process management should be improved by increasing the water amount to add to the rotting waste since the output material had moisture (19.7 % WM) lower than the recommended content for an optimized aerobic biodegradation (>40 %). Furthermore, fractions having particle size higher than 10 mm, composed of high content of impurities and heavy metals, should be separated by obtaining a reduction in chemical–physical contamination. Finer waste flow (<10 mm) can be recovered in environmental remediation activities, whereas coarser fractions (>10 mm) can be used in waste-to-energy plants, given the great content of high calorific value materials and the compliance with characteristics defined for solid recovered fuels.

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Acknowledgments

The authors thank the employees of the MBT plant of Rome for the support during sampling activities, as well as Erwin Binner for critical comments and suggestions on the manuscript prior to the submission.

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Authors and Affiliations

  1. Department of Civil Engineering and Computer Science Engineering, University of Rome ‘‘Tor Vergata’’, Via del Politecnico 1, 00133, Rome, Italy

    M. C. Di Lonardo, F. Lombardi & R. Gavasci

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  1. M. C. Di Lonardo
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  2. F. Lombardi
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  3. R. Gavasci
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Corresponding author

Correspondence to M. C. Di Lonardo.

Abbreviations

DRI

Dynamic respiration index

DM

Dry matter

HM

Heavy metals

MBT

Mechanical biological treatment

MSW

Municipal solid waste

PS

Particle size

RA

Respiration activity

RDF

Refuse derived fuel

SBW

Stabilized biowaste

SRF

Solid recovered fuel

UBW

Untreated biowaste

WM

Wet matter

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Di Lonardo, M.C., Lombardi, F. & Gavasci, R. Quality evaluation and improvement of mechanically–biologically treated municipal solid waste in view of a possible recovery. Int. J. Environ. Sci. Technol. 12, 3243–3254 (2015). https://doi.org/10.1007/s13762-014-0735-4

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