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Combined sewer systems collect and carry both runoff from storm events and wastewater. Combined sewer overflows result in the release of 23 billion gallons of untreated wastewater in New Jersey each year. Installation of separate sanitary sewers can prevent this problem, but upgrading sewer systems in New Jersey is an $8 billion problem. Due to the high cost of upgrading sewer systems, end-of-pipe treatment options are desirable. Major challenges for achieving end-of-pipe treatment are the (1) variable nature of the combined sewer overflow effluent and (2) uncertainties associated with wet weather treatment technologies. The aims of this work are to understand how the concentration and character of chemical and microbial contaminants varies during wet weather flows to improve design of treatment technologies. Research will take place in the field and laboratory to answer these questions.
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