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Characteristics of Transformation Process of Wastewater in Sewer  

Lee, Doo-Jin (Korea Institute of Water and Environment, Korea Water Resources Corporation)
Kim, Moon-Il (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.9, 2005 , pp. 911-916 More about this Journal
Abstract
In this study, variations of water quality, sediment size and contaminant substances are analyzed at upstream and downstream in sewer systems in order to evaluate the characteristics of wastewater transformation by physico-chemical and biological reactions. The differences of DOC concentration between up and down stream showed the range of $-5.8{\sim}18.6$ from the result of continuous measurement at up and down stream. About 8.4% of DOC concentration was reduced and reduction rate was 2.3 mg/L/km. SS reduction rate was measured by 5.5 mg/L/km, 0.22 mg/L/min from upstream to downstream, which was twice than DOC reduction rate. When pollution load reduction was evaluated considering infiltration/inflow effect, DOC load was eliminated from 1,230 ka/d to 1,167 kg/d by physi-chemical and biological reaction in a sewer and 7.8% of the SS in upstream station was reduced under dry weather condition. The results showed that the characteristics of transformation process of wastewater in sewer should be considered for design and operation of wastewater treatment plant.
Keywords
Sewer System; Sediment; Physico-Chemical and Biological Reactions; Water Quality Transformation;
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