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

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Systems Analysis of Zaragoza UWS Guillermo Penagos facilities, but nothing has been done yet. The Local Agenda 21 Office also suggested an assessment of water losses and energy consumption for these tanks as part of demonstration activities for Zaragoza within the SWITCH framework. Figure 6 shows a scheme of the typical breaking pressure tank as described by municipality staff. Meters Ground floor Bassement Pump Breaking pressure tank Sewer Drinking water pipeline Figure 6. Scheme of a breaking pressure tank 4.2.5 Sewer system Zaragoza has got a combined sewer system to which nearly all Industries and neighborhoods are nowadays connected. As previously described, some excess of irrigation water may also reach the sewer system. Nearly all industrial activities are currently taking place in areas surrounding the city, so called “Industrial Polygons”. Industrial discharges are regulated by a local law since 1986. There are 23 physicchemical parameters that industrial waste waters must meet to be discharged into municipal sewers. Local Agenda 21 Office asks each industry for a discharge statement where all substances and processes involved in the industrial activity must be described. Industries should also implement management options intended to reduce WW pollution. Substances classified as harmful or toxic are not to be discharged into municipal sewers. Agenda 21 Office carries out inspection visits in order to confirm the information provided by the industry. Industrial discharge statements are classified as shown in table 3. 30
Systems Analysis of Zaragoza UWS Guillermo Penagos Table 3. Classification of industrial discharges in Zaragoza in 2005 Class Definition % of Industrial activities falling in each category in 2005 0 Similar to domestic WW. No statement required 25 1 Discharge < 15 m 3 day -1 . No toxic substances 65 2 Discharge > 15 m 3 day -1 and < 50 m 3 day -1 . No toxic 5 Discharge < 15 m 3 day -1 possible content of toxic substances 3 > 50 m 3 day -1 5 Iinformation concerning each industrial discharge statement is introduced into a data base. Included aspects are: • Discharge location • Industrial activity • Both potential and actual pollutants emitted to the environment • Toxic substances used along the industrial process • Water consumption • WW quality • WWT or processes aimed to reduce WW pollution • Legal information (licences, etc) Zaragoza sewer infrastructure is fully mapped in a GIS, but it has not been yet modelled, therefore there are no data concerning flows or substances transport and transformation. 4.2.6 Wastewater treatment Zaragoza has got two public WWTP. General features for the two plants are provided in table 4. The average inflow for “La Almozara” is 12 million m 3 year -1 for “La Cartuja” is 59 million m 3 year -1 . In addition to those public treatment plants there are also two private ones treating industrial sewage from two paper mills which do not use tap water but extract groundwater. Since these two companies own WWTPs they are not connected to Zaragoza sewer system, but discharge into the Gallego and the Ebro River (see figure 2). The authority in charge of controlling such discharges is not the Local Agenda 21 Office but the CHE. These two WWTPs provide the same sewage and sludge treatment than “Almozara” and together they treat even more water, around 13.6 million m 3 year -1 (see figure 2). Therefore they are also considered for all analyses in this report and they will be referred to as “Paper mills”. 31
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