Systems Analysis of Zaragoza Urban Water - SWITCH - Managing ...

Systems Analysis of Zaragoza UWS Guillermo Penagos
Table 7. Seasonal impact peaks of Zaragoza UWS upon the Ebro River under present conditions and worst climate change scenarios for 2020 and
2060. These impacts are calculated on the basis of current pollutant concentrations in August, when river discharge is at minimum and projected river flows
for the same month in 2020 and 2060. (see figure 27). So this can be considered as the maximum impact that Zaragoza might annually have upon the Ebro
River
Parameter
Current
Current impact of Zaragoza 2020 2060
concentrations
upstream from
Zaragoza during
Expected
%* Expected
%* Expected
%*
summer time
raising of
raising of
raising of
Concentration
Concentration
Concentration
BOD (mg l -1 ) 6.4 – 10.4 7.5 – 11.5 13 7.9 – 11.9 18 6.7 – 13.7 20
COD (mg l -1 ) 5.2 – 14.4 10.1 -19.3 50 11.8 – 21.0 67 19.6 – 28.8 147
TN (mg l -1 ) 2.8 – 7.9 4.6 – 9.7 33 5.2 – 10.3 45 7.9 – 13.0 95
TP (µg l -1 ) 120 – 200 326 - 406 110 396 – 476 173 718 – 798 374
Heavy metals (µg l -1 ) 113 – 324 152 - 363 17 165 – 376 24 225 – 436 51
* The percentage in this table refers to the increasing with respect to the current value.
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