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The potential to gain energy from the extractable fraction of organic waste

Composting is a widely used method to treat organic waste; it is, however, not an energy-efficient method. When an existing compost treatment plant is provided with a simple percolation system, an organically loaded liquid fraction can be gained from the compost. In a further step this liquid fraction can be digested to biogas which then delivers energy through a combined heat and power unit.

During this work the potential extraction of organic matter from compost was examined in various percolation experiments. Percolate was collected and tested for its organic content with the chemical oxygen demand (COD) being the main reference parameter. The gas production potential of the percolate was quantified in a batch-digestion-test with OxiTop®-pressuremeasurement. Depending on input material and percolation conditions, the COD yield varied a lot. Interrelationships were difficult to point out due to the high variability of certain parameters. Nevertheless, in an over-all examination a base for the calculation of the potential COD yield in an existing compost treatment plant could be established. Further calculations lead to a potential annual electricity amount of 330.000 kWh which could be gained from the organically loaded liquid fraction. A simplified feasibility study showed positive results for the integration of a percolation system in an existing compost treatment plant.

Copyright:	© IWWG International Waste Working Group
Quelle:	Venice Conference 2006 (November 2006)
Seiten:	5
Preis:	€ 0,00
Autor:	D. Sperl K. Meyer H. Insam
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