International Scientific Journal


The combustion characteristics of blends of lignite with various organic waste materials are evaluated in this study in order to assess their potential for energy recovery. Different types of municipal solid waste (MSW) (i.e. paper, plastic, textile, organic), as well as sewage sludge and agri-residues (sunflower shells) samples were collected from the Western Macedonia region, northern Greece. Mixtures of each one of them with lignite in different proportions (30-50-70 wt%) were prepared. Proximate analysis, calorific value determination and thermogravimetry (TGA/DTG) were performed. Thermal parameters such as ignition temperature, total weight loss, maximum rate of weight loss, peak and burnout temperatures and burnout time were determined from the TG/DTG profiles of the raw materials and their blends. The combined utilization of proximate analysis, calorific value determination and TG/DTG method proved to be an effective method for a preliminary assessment of the energetic potential of raw solid waste “combustible” materials and their blends with lignite. The analytical results revealed that most of the blends are promising for energy recovery. Regarding the raw wastes, sunflower shells were the most reactive. A non-synergistic effect was found for the blends. Organic and sewage sludge blends revealed the lowest combustibility, which is attributed to the high content of inorganic matter and the heterogeneity of these two types of wastes.
PAPER REVISED: 2017-10-02
PAPER ACCEPTED: 2017-10-19
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  1. Athanasiou, C. J., et al., Feasibility Analysis of Municipal Solid Waste Mass Burning in the Region of East Macedonia – Thrace in Greece, Waste Management & Research, 33 (2015), 6, pp. 561-569
  2. Vamvuka, D., et al., Potential of Poor Lignite and Biomass Blends in Energy Production, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 38 (2016), 14, pp. 2079-2085
  3. ***, DIADYMA S. A., Management Plan for the Municipal Solid Wastes (MSW) of the Western Macedonia Region, (Internal unpublished report), 2016
  4. Zabaniotou, A. A., et al., Sunflower Shells Utilization for Energetic Purposes in an Integrated Approach of Energy Crops: Laboratory Study Pyrolysis and Kinetics, Bioresource Technology, 99 (2008), 8, pp. 3174-3181
  5. Cardozo, E., et al., Combustion of Agricultural Residues: An Experimental Study for Small-Scale Applications, Fuel, 115 (2014), Jan., pp. 778-787
  6. Vamvuka, D., et al., Evaluation of Urban Wastes as Promising Co-Fuels for Energy Production – A TG/MS Study, Fuel, 147 (2015), May, pp. 170-183
  7. Magdziarz, A., et al., Investigation of Sewage Sludge Preparation for Combustion Process, Chemical and Process Engineering, 32 (2011), 4, pp. 299-309
  8. Magdziarz, A., et al., Properties of Ash Generated During Sewage Sludge Combustion: A Multifaceted Analysis, Energy, 113 (2016), Oct., pp. 85-94
  9. Iordanidis, A., et al., Petrographic Composition and Palaeoenvironment of the Amynteo Lignite Deposit, Northern Greece, Energy Sources, Part A Recovery, Utilization and Environmental Effects, 36 (2014), 24, pp. 2715-2724
  10. Magdziarz, A., Wilk, M., Thermogravimetric Study of Biomass, Sewage Sludge and Coal Combustion, Energy Conversion and Management, 75 (2013), Nov., pp. 425-430
  11. Varol, M., et al., Investigation of Co-Combustion Characteristics of Low Quality Lignite Coals and Biomass with Thermogravimetric Analysis, Thermochimica Acta, 510 (2010), 1-2, pp. 195-201
  12. Buratti, C., et al., Thermogravimetric Analysis of the Behavior of Sub-Bituminous Coal and Cellulosic Ethanol Residue during Co-Combustion, Bioresource Technology, 186 (2015), June, pp. 154-162
  13. ***, ASTM D 5142-09, Standard Test Methods for Proximate Analysis of the Analysis Sample of Coal and Coke by Instrumental Procedures, ASTM International, West Conshohocken, Penn., USA, 2009
  14. ***, ASTM D 5865-13, Standard Test Method for Gross Calorific Value of Coal and Coke, ASTM International, West Conshohocken, Penn., USA, 2013
  15. Suksankraisorn, K., et al., Co-Firing of Thai Lignite and Municipal Solid Waste (MSW) in a Fluidised Bed: Effect of MSW Moisture Content, Applied Thermal Engineering, 30 (2010), 17-18, pp. 2693-2697
  16. Sahu, S. G., et al., Coal-Biomass Co-Combustion: An Overview, Renewable and Sustainable Energy Reviews, 39 (2014), Nov., pp. 575-586
  17. Vamvuka, D., Sfakiotakis, S., Combustion Behaviour of Biomass Fuels and their Blends with Lignite, Thermochimica Acta, 526 (2011), 1-2, pp. 192-199
  18. Casado, R. R., et al., Classification and Characterisation of SRF Produced from Different Flows of Processed MSW in the Navarra Region and its Co-Combustion Performance with Olive Tree Pruning Residues, Waste Management, 47 (2016), Part B, pp. 206-216
  19. Kijo-Kleczkowska, A., et al., Experimental Research of Sewage Sludge with Coal and Biomass Co-Combustion, in Pellet Form, Waste Management, 53 (2016), July, pp. 165-181
  20. Iordanidis, A., et al., Application of TG-DTA to the Study of Amynteon Lignites, Northern Greece, Thermochimica Acta, 371 (2001), 1-2, pp. 137-141
  21. Fernandes, E. R. K., et al., Thermochemical Characterization of Banana Leaves as a Potential Energy Source, Energy Conversion and Management, 75 (2013), Nov., pp. 603-608
  22. Hu, S., et al., Thermogravimetric Analysis of the Co-Combustion of Paper Mill Sludge and Municipal Solid Waste, Energy Conversion and Management, 99 (2015), July, pp. 112-118
  23. Toptas, A., et al., Combustion Behavior of Different Kinds of Torrefied Biomass and Their Blends with Lignite, Bioresource Technology, 177 (2015), Feb., pp. 328-336
  24. Yu, D., et al., An Assessment on Co-Combustion Characteristics of Chinese Lignite and Eucalyptus Bark with Tg-Ms Technique, Powder Technology, 294 (2016), June, pp. 463-471
  25. Idris, S. S., et al., Combustion Characteristics of Malaysian Oil Palm Biomass, Sub-Bituminous Coal and their Respective Blends via Thermogravimetric Analysis (TGA), Bioresource Technology, 123 (2012), Nov., pp. 581-591

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