Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...
Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ... Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...
Systems Analysis of Zaragoza UWS Guillermo Penagos 4.3.2 Energy consumption and Atmospheric emissions Figure 8 shows the total energy consumption of Zaragoza UWS discriminated by process. Both direct as well as indirect energy consumption are included. Direct consumption is electric power required for operation. Indirect consumption is the one required for transportation of both sludge and chemical products. It can be seen that around 60% of total consumption is due to WWT process. The contribution of groundwater extraction to total energy consumption is negligible. Energy consumption per water cubic meter is around 0.35 Kwh for WWT, 0.12 Kwh for DWT and 0.02 Kwh for groundwater extraction. Sludge digestion at “Almozara” and “Paper mills” as well as heat recovery at “Cartuja” allow energy production by the UWS for about 4 Gwh every year, which represents 10% of total energy consumption by the UWS system. (see figure 8). 34
Systems Analysis of Zaragoza UWS Guillermo Penagos 10 Energy (Gwh) 50 40 30 20 10 Water supply Ground water WWT Energy recovery (Gwh) 8 6 4 2 0 2001 2002 2003 2004 2005 2006 Year 0 2001 2002 2003 2004 2005 2006 Year Water supply Ground water WWT 0.40 Energy (Kwh m 3 ) 0.30 0.20 0.10 0.00 2001 2002 2003 2004 2005 2006 Year Figure 8. Energy consumption of Zaragoza’s UWS per process. Left up: Total energy consumption. Right: Energy recovery (energy produced by sludge digestion and heat recovering at WWTPs). Left down: Energy consumption per cubic meter. 35
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<strong>Systems</strong> <strong>Analysis</strong> <strong>of</strong> <strong>Zaragoza</strong> UWS Guillermo Penagos<br />
10<br />
Energy (Gwh)<br />
50<br />
40<br />
30<br />
20<br />
10<br />
<strong>Water</strong> supply Ground water WWT<br />
Energy recovery (Gwh)<br />
8<br />
6<br />
4<br />
2<br />
0<br />
2001 2002 2003 2004 2005 2006<br />
Year<br />
0<br />
2001 2002 2003 2004 2005 2006<br />
Year<br />
<strong>Water</strong> supply Ground water WWT<br />
0.40<br />
Energy (Kwh m 3 )<br />
0.30<br />
0.20<br />
0.10<br />
0.00<br />
2001 2002 2003 2004 2005 2006<br />
Year<br />
Figure 8. Energy consumption <strong>of</strong> <strong>Zaragoza</strong>’s UWS per process. Left up: Total<br />
energy consumption. Right: Energy recovery (energy produced by sludge digestion<br />
and heat recovering at WWTPs). Left down: Energy consumption per cubic meter.<br />
35
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