Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 463, Issue -, Pages 904-912Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2013.06.010
Keywords
CSO; Monitoring; Sewer system; Temperature; Wastewater; CSS
Categories
Funding
- Consorci per la Defensa de la Conca del Riu Besos (CDCRB)
- Spanish Ministry of Science and Innovation (ENDERUS) [CTM-2009-13018]
- Spanish National Project [CTM-2011-27163]
- Juan de la Cierva [jci-2009-05604, FPI BES2010-039247]
- European Union [FEDER-CTM2009-13018]
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Combined sewer overflow (CSO) events produced in combined sewer systems (CSS) during wet weather conditions are a threat for the receiving water bodies. The large number of CSO structures normally present in a CSS makes that the monitoring of the complete CSO network in a simultaneous way would drastically increase the investment costs. In this paper, a new methodology is presented aiming to characterize the occurrence and duration of CSO events by means of low-cost temperature sensors. Hence, a large number of CSO structures can be simultaneously monitored and the system can be characterized as a whole. The method assumes temperature differences between the overflowing mix of wastewater and stormwater and the sewer gas phase, so the temperature shift produced during a rainfall episode is related to a CSO event occurrence. The method has been tested and validated in La Garriga CSS (Spain) where the temperature at 13 CSO weirs was monitored for a period of 1 year (57 rainfall episodes). For the whole set of CSO events, occurrence and duration were successfully determined in 80% of cases. Advantages, limitations and potential applications of the method are discussed at the end of the paper. (C) 2013 Elsevier B.V. All rights reserved.
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