Anaerobic Digestion - Metropolitan Water Reclamation District of ...
Anaerobic Digestion - Metropolitan Water Reclamation District of ...
Anaerobic Digestion - Metropolitan Water Reclamation District of ...
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Significance and Drivers<br />
• Electric use for centralized W&WW treatment<br />
accounts for 3.0% * <strong>of</strong> US electricity use<br />
• $4 billion annually, 25-30% <strong>of</strong> total plant O&M<br />
Cost **<br />
• Direct US GHG Emissions (2006) *** - Municipal WW<br />
treatment-<br />
• 0.4 % <strong>of</strong> total GHG emissions<br />
• 3.0% <strong>of</strong> total anthropogenic Methane (CH 4 ) and<br />
2.2% <strong>of</strong> total Nitrous Oxide (N 2 O) emissions<br />
• CH 4 : 16 Tg CO 2 eq., N 2 O: 8.1 Tg CO 2 eq.<br />
• Estimated US GHG Emissions (2006) from electricity<br />
generation for centralized W&WW treatment: 69.8 Tg<br />
CO 2 eq. **** (1.2% <strong>of</strong> total US GHG emissions)<br />
* Electric Power Research Institute (EPRI)<br />
** Energy Star Program<br />
*** Inventory <strong>of</strong> Greenhouse Gas Emissions and Sinks: 1990 – 2006, EPA, 2008<br />
**** EPRI estimate & Inventory <strong>of</strong> Greenhouse Gas Emissions and Sinks: 1990 – 2006, EPA, 2008
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