The sewer is traditionally considered simply as a means of transporting waste flows and storm-water runoff to a sewage treatment plant or directly to receiving waters via overflow structures during wet weather periods. Except for the transport of sediment and formation of H2S, processes taking place in the sewer are normally neglected. In reality, wastewater in sewer systems is subject to important physical, chemical and biological changes and the sewer should be considered as an integral part of the urban wastewater system. Among the processes that have significant implications are: corrosion of sewers caused by H2S, odour problems from anaerobic transformation of organic matter, contamination of sewer atmosphere, solids deposits, pollution of receiving waters from combined sewer overflows, and operational problems for wastewater treatment plants, particularly those with denitrification and biological phosphorous removal. These selected proceedings record the results of pioneering research as presented at a highly successful and groundbreaking conference.
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