Abstract
Wastewater treatment facilities collecting wastewater from longstanding sewer networks of five municipalities in the Ave River basin (located in NW Portugal) are especially vulnerable to water inflows since they have considerable extensions of sewers installed in stream and riverbeds. TRATAVE, the company responsible for operating the system, designed and implemented a monitoring network to measure discharges along the entire drainage network and treatment facilities in order to reduce those water inflows. Several flow measurement devices were installed at strategic locations within the sewer network and integrated with a SCADA system responsible for its operation. A decision support system (DSS) is being implemented using the Delft-FEWS platform, integrating monitoring data and models. Based on monitored data and model results, an estimation of infiltration volumes during wet periods is presented. Moreover, the capabilities of the DSS are illustrated in: (i) location of manholes losses along sewer networks during wet periods; (ii) identification and location of unknown connections to the sewer network using wastewater balances; and (iii) design of a PID controller for a pumping station using on-line tank water level measurement. Acquired knowledge resulting from the DSS greatly improved the utility performance both in terms of economic revenue and environmental protection.
Highlights
Sewer systems are responsible for the transport of domestic and industrial wastewaters and rainwater to one or more terminal points, where they are treated before their disposal to a receiving environment (Puig )
This infiltration is quite problematic since all the wastewater treatment plants (WWTP) were designed to receive domestic and industrial effluents with low volumes of infiltrated stormwater
A relatively complex transport and treatment system is being used as a living laboratory to support research on proper operational control techniques to deal with infiltration of stormwater in sewer networks
Summary
Sewer systems are responsible for the transport of domestic and industrial wastewaters and rainwater to one or more terminal points, where they are treated before their disposal to a receiving environment (Puig ). Mathematical modelling of wastewater systems has become. These tools can be used to properly solve different operational problems. Undesirable water infiltration in wastewater drainage systems has been studied in several previous works. The processes that contribute to these inflows are diverse, their entrance through manholes, infiltrations through sewer pipe joints and clandestine connections of storm waters and industrial waters to the wastewater sewer network
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