Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...
Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...
Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...
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<strong>Systems</strong> <strong>Analysis</strong> <strong>of</strong> <strong>Zaragoza</strong> UWS<br />
Guillermo Penagos<br />
Table 4. <strong>Zaragoza</strong> public WWTPs<br />
WWTP Cartuja<br />
Almozara<br />
Parameter<br />
Sewage Origin Industrial and domestic Industrial and domestic<br />
Average flow at design<br />
3.00 0.40<br />
(m 3 s -1 )<br />
Average actual flow in<br />
1.72 0.37<br />
2006 (m 3 s -1 )<br />
<strong>Water</strong> treatment<br />
Primary sedimentation, Biological Primary decantation, Biological<br />
treatment by activated sludge and treatment by activated sludge and<br />
secondary decantation<br />
secondary<br />
decantation,<br />
Phosphorus removal with Iron<br />
Chloride<br />
Sludge treatment Primary and secondary digestion<br />
plus dehydration by filter press<br />
Centrifuge dehydration flowed by<br />
incineration<br />
As it can be seen in table 4 “Almozara” is working near its actual capacity whereas<br />
“Cartuja” seems to be over dimensioned and is working at half <strong>of</strong> its actual capacity.<br />
4.3 Environmental performance <strong>of</strong> <strong>Zaragoza</strong> UWS<br />
4.3.1 Use <strong>of</strong> chemical products<br />
Figure 7 shows the annual consumption <strong>of</strong> chemical products by <strong>Zaragoza</strong> UWS<br />
from 2000 for DWT and from 2001 for WWT. There is a steady trend over these<br />
years, but Chlorine and Allum shows a clear reduction for 2005 and 2006, from<br />
around 3000 to 2500 ton and from 8000 to 6000 ton respectively. PAC use for DWT<br />
started in 2003 and it has not been steady since then.<br />
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