Abstract
An optimal pollution control (OPC) model for interceptor sewer systems has been developed to minimize total pollution overspill load to receiving waters. This derives from a formal optimization applied to a simplistic hydraulic representation of the sewer, under a so-called 'slug flow' approach. Combined sewer overflow (CSO) structures are represented and the model tracks the pollution concentrations in the CSOs as well as incoming pollution loads in arriving at its optimal spill strategy at each such structure. In essence, the strategy strives to defer overspill to river as far as is possible and, when unavoidable, to first release sewage carrying the lowest pollution loads for minimum receiving water impact. This paper describes an academically driven study on the application of the OPC model to part of the Liverpool Interceptor Sewer system during a typical year of rainfall. The results show that the OPC model considerably reduces pollution overspill load compared to fixed local control strategies, by as much as 70% in the case study presented. Furthermore, the approach is computationally efficient and therefore holds promise for application in real time.
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