The combination of Mechanical Biological Treatment (MBT) and Susteinable Landfill managed mainly in anaerobic way have been analyzed for a given Italian municipal solid waste management system. Non Differentiate Wastes (NDW) entering the MBT are mechanically sorted in two separate streams a Dry and a Waste Organic Fraction (WOF) one. The WOF, with high organic material content, is then processed in the aerobic biological treatment section of the MBT for being stabilized before being disposed off. In the next future, this WOF will be disposed in a landfill that has been permitted to be managed as bioreactor, with leachate recirculation. This can lead to an increase of the biological activity inside the landfill body during the disposal period, enhancing a more rapid stabilization and environmental recovery of the site. Combining together an adequate aerobic pre-treatment period with the management of the landfill in sustainable way, can lead also to some energetic advantages by enhancing both the quality and the quantity of biomethane effectively recoverable. Experimental runs shows that an aerobic pre-treatment period ranging from 15 to 30 days can lead to a maximum biomethane yield per kg of VS of the WOF disposed. Further, the choice of a correct interval of time among the activation of the leachate recirculation for the different landfill waste cells, can lead to an optimization of the amount of energy effectively recoverable. The aerobic pretreatment leads to a significant VS reduction in the first 30 days, after which the VS concentration results to be quite constant. Similarly the Dynamic Respirometer Index Potential results significantly reduced in the first 15 days of aerobic pre-treatment passing from about 5,000 to about 3,500 mgO2/kgVSh. Maximum biomethane production is achieved for the sample with 30 days of aerobic pre-treatment and results to be about 10 Nm3tonne-1 of disposed WOF. The amount of electrical energy producible ranges from 15,000 to 17,000 MWh.

Management of the Biodegradable Fraction of Residual Waste by Sustainable Landfill

DI MARIA, Francesco;
2012

Abstract

The combination of Mechanical Biological Treatment (MBT) and Susteinable Landfill managed mainly in anaerobic way have been analyzed for a given Italian municipal solid waste management system. Non Differentiate Wastes (NDW) entering the MBT are mechanically sorted in two separate streams a Dry and a Waste Organic Fraction (WOF) one. The WOF, with high organic material content, is then processed in the aerobic biological treatment section of the MBT for being stabilized before being disposed off. In the next future, this WOF will be disposed in a landfill that has been permitted to be managed as bioreactor, with leachate recirculation. This can lead to an increase of the biological activity inside the landfill body during the disposal period, enhancing a more rapid stabilization and environmental recovery of the site. Combining together an adequate aerobic pre-treatment period with the management of the landfill in sustainable way, can lead also to some energetic advantages by enhancing both the quality and the quantity of biomethane effectively recoverable. Experimental runs shows that an aerobic pre-treatment period ranging from 15 to 30 days can lead to a maximum biomethane yield per kg of VS of the WOF disposed. Further, the choice of a correct interval of time among the activation of the leachate recirculation for the different landfill waste cells, can lead to an optimization of the amount of energy effectively recoverable. The aerobic pretreatment leads to a significant VS reduction in the first 30 days, after which the VS concentration results to be quite constant. Similarly the Dynamic Respirometer Index Potential results significantly reduced in the first 15 days of aerobic pre-treatment passing from about 5,000 to about 3,500 mgO2/kgVSh. Maximum biomethane production is achieved for the sample with 30 days of aerobic pre-treatment and results to be about 10 Nm3tonne-1 of disposed WOF. The amount of electrical energy producible ranges from 15,000 to 17,000 MWh.
2012
9788890769429
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/887498
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