Mechanical-biological waste process of municipal solid waste: pilot laboratory project

From October 2008 to May 2009, the Centre de recherche industrielle du Québec (CRIQ) performed a pilot laboratory project on behalf of the City of Montreal, pertaining to energy recovered from municipal solid waste (MSW) through mechanical-biological treatment (MBT), a process which combines mechanical components (grinding and sifting) with a biological component (biological drying).

Further authors:
M. Daigle, O. Solomatnikova, M.-A. St-Pierre - Centre de recherche industrielle du Québec

This project was intended to develop the optimal production conditions required for producing a viable, energy-recovered by-product with desirable end-user characteristics (cement plants, cogeneration plants, boiler houses, etc.). Work performed included:
• Sampling and characterization of various types of MSW available throughout the City of Montreal territory;
• Assessment of the need to create mixtures from various types of available MSW;
• Seeking information as to the desired characteristics required for energy recovery of fuels produced through MBT processes;
• Performance of laboratory and large-scale MBT tests related to MSW in order to assess the need of using biological drying procedures on MSW or on individual fractions after sieving. These tests were intended to determine the proportions and characteristics of the various individual fractions obtained during the sieving processes of MSW;
• Research and selection of equipment required for MBT processes and research of Quebec equipment manufacturers available in this area;
• Interpretation and mainstreaming of results leading to the development of a MBT supply chain process specifically designed for City of Montreal MSW.
 
Results from the work performed have shown that:
• The quantity of waste generated per household is approximately 11.3 kg/week/household and this waste has a moisture content of approximately 40%;
• The ‘compostable material’ category constitutes more than 50% of MSW and has a promising calorific value of 20 megajoules per kg on a dry basis;
• The coarser fraction (above 100 mm) is the most interesting fraction with respect to energy recovery. It represents 50% or more of all domestic garbage, has a moisture content of 15%, is not strong-smelling and does not require stabilization. The chlorine content of this fraction presently represents one of the main constraints in that based on criteria of 2 Quebec cement plants, the requirements were not met.
• The intermediate fraction (between 50 and 100 mm) must be dried and stabilized in order to consider its use as a fuel;
• The fine fraction (less than 50 mm) which represents approximately 10% of all MSW and contains a significant proportion of organic matter also has the highest moisture content and the lowest calorific value. Biological drying will lower the moisture content to approximately 20% and, at the same time, stabilize it biologically. The fine fraction which is biologically dried could be used as backfill in engineered landfill sites.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 7
Preis inkl. MwSt.: € 7,00
Autor: Yves Bernard
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