14.12.2012 Views

International Review of Waste Management Policy - Department of ...

International Review of Waste Management Policy - Department of ...

International Review of Waste Management Policy - Department of ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Table 63-15: Assumed Used for Modelling Biodrying Phase<br />

Parameter Parameter Parameter<br />

Ass Assumption Ass umption<br />

Residence time in biodrying phase 12 days<br />

Residence time <strong>of</strong> rejects in maturation (stabilisation) phase 7 weeks<br />

Electricity requirement 1 40 kWh / t input<br />

Diesel use by process 1 0.5 l / t input<br />

CH4 emissions from process 2 0.01 kg / t input<br />

N20 emissions from process 2 0.02 kg / t input<br />

Recovery rate for ferrous metals 80%<br />

Recovery rate for non-ferrous metals 80%<br />

Recovery rates for plastics 70%<br />

Notes:<br />

1. Per tonne input to the MBT facility.<br />

2. Per tonne input to the biodrying process.<br />

Table 63-16: Model Parameters for Residual <strong>Waste</strong> to SRF<br />

Parameter Parameter Parameter<br />

Assumption Assumption<br />

Assumption<br />

Amount <strong>of</strong> SRF produced by biodrying process (per tonne to facility) 0.4 tonnes<br />

Energy content <strong>of</strong> SRF (lower heating value as received) 16.5 MJ / kg<br />

% <strong>of</strong> carbon that is non-fossil 46%<br />

63.5.2 Air Quality Impacts <strong>of</strong> Aerobic Biodrying Systems<br />

As is the case with the aerobic stabilisation systems, biodrying plant typically install<br />

controlled air supply systems and bi<strong>of</strong>ilters to minimise the impact <strong>of</strong> organic<br />

pollutants emanating from the aerobic degradation process. Non-GHG air emissions<br />

are calculated from work undertaken for the Austrian Umweltbundesamt, though we<br />

have adapted these over time based on more up to date data. 1251 These are<br />

dependent upon the choice <strong>of</strong> emissions abatement equipment at the plant (each<br />

modelled in the study). There are three key options which the study addressed:<br />

1008<br />

� Basic bi<strong>of</strong>ilter;<br />

1251 Uwe Lahl, Barbara Zeschmar-Lahl and Thomas Angerer (2000) Entwicklungspotentiale der<br />

Mechanisch-biologischen Abfallbehandlung: Eine Ökologische Analyse, Vienna: Umweltbundesamt,<br />

June 2000.<br />

29/09/09

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!