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 3. Classification <strong>of</strong> industrial discharges in <strong>Zaragoza</strong> in 2005<br />
Class Definition<br />
% <strong>of</strong> Industrial<br />
activities falling<br />
in each category<br />
in 2005<br />
0 Similar to domestic WW. No statement required 25<br />
1 Discharge < 15 m 3 day -1 . No toxic substances 65<br />
2 Discharge > 15 m 3 day -1 and < 50 m 3 day -1 . No toxic<br />
5<br />
Discharge < 15 m 3 day -1 possible content <strong>of</strong> toxic substances<br />
3 > 50 m 3 day -1 5<br />
Iinformation concerning each industrial discharge statement is introduced into a data<br />
base. Included aspects are:<br />
• Discharge location<br />
• Industrial activity<br />
• Both potential and actual pollutants emitted to the environment<br />
• Toxic substances used along the industrial process<br />
• <strong>Water</strong> consumption<br />
• WW quality<br />
• WWT or processes aimed to reduce WW pollution<br />
• Legal information (licences, etc)<br />
<strong>Zaragoza</strong> sewer infrastructure is fully mapped in a GIS, but it has not been yet<br />
modelled, therefore there are no data concerning flows or substances transport and<br />
transformation.<br />
4.2.6 Wastewater treatment<br />
<strong>Zaragoza</strong> has got two public WWTP. General features for the two plants are provided<br />
in table 4. The average inflow for “La Almozara” is 12 million m 3 year -1 for “La<br />
Cartuja” is 59 million m 3 year -1 . In addition to those public treatment plants there are<br />
also two private ones treating industrial sewage from two paper mills which do not<br />
use tap water but extract groundwater. Since these two companies own WWTPs they<br />
are not connected to <strong>Zaragoza</strong> sewer system, but discharge into the Gallego and the<br />
Ebro River (see figure 2). The authority in charge <strong>of</strong> controlling such discharges is<br />
not the Local Agenda 21 Office but the CHE. These two WWTPs provide the same<br />
sewage and sludge treatment than “Almozara” and together they treat even more<br />
water, around 13.6 million m 3 year -1 (see figure 2). Therefore they are also<br />
considered for all analyses in this report and they will be referred to as “Paper mills”.<br />
31