Modeling the Formation and Fate of Odorous Substances in Collection Systems

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A conceptual model that simulates the formation and fate of odorous substances in branched collection systems is presented. The model predicts the activity of the relevant biomass phenotypes under aerobic, anoxic and anaerobic conditions in force mains and gravity sewers. The formation and fate of individual, malodorous substances in the bulk water, the biofilms and the sediments are modeled. The release of odorous compounds from the bulk water to the sewer gas phase, their fate in the gas phase and their subsequent ventilation into the urban atmosphere is simulated. Examples of model application include the prediction of hydrogen sulfide and malodorous fermentation products from force mains and gravity sewers.

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