Unformatted text preview: This paper aims at comparing the cost effectiveness of the two mainly used wastewater system, that is the combined sewer system and the separate sewer system, based on the analysis of simulations. The problem which of the 2 systems is better was heavily discussed over the years. The answer to the question is usually the same: it depends. In this paper specific answers are given for specific cases. The results are subsequently summarized and can help in the system choice to be implemented. Despite earlier reasoning, studies on river water quality strongly indicate that the separate system is not always the better solution because the polluted runoff from the street, containing e.g. different heavy metals, is discharged directly into the river. This paper aims to compare the two different sewer systems on the basis of literature data and simulation of specific cases. The results are evaluated, as suggested in the EU-Water Framework Directive on the basis of different assessment criteria: river water quality and morphology impacts, emissions and costs. A specifically tailored weighting system is used for the evaluation of the better solution for each analysed case....
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- Spring '12
- sewer systems, Chemical oxygen demand, River Water Quality, different pollutants