• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1999.10a
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• pp.44-47
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• 1999

• Proceedings of the KSEEG Conference
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• 2002.04a
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• pp.377-379
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• 2002

• Proceedings of the KSEEG Conference
• /
• 2002.04a
• /
• pp.406-408
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• 2002

• Proceedings of the Korean Environmental Health Society Conference
• /
• 2001.04a
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• pp.99-100
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• 2001

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2003.04a
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• pp.73-74
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• 2003

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 1999.04a
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• pp.182-184
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• 1999

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1998.10a
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• pp.312-313
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• 1998

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2018.10a
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• pp.79-79
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• 2018

• Journal of the Korean GEO-environmental Society
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• v.15 no.8
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• pp.45-50
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• 2014

The microorganism decomposition experiment of sewage in the underground sewer has the limit of experiment condition and time. The way to reproduce the microorganism decomposition in the underground sewer was studied using batch reactor setting up the DO as a limiting condition. The DO concentration in the sewer is controlled by reaeration. It is possible to obtain correlation between flow condition and reaeration coefficient through the reproduction of reaeration phenomenon by controlling the flow condition in the sewer using this phenomenon. And it is possible to set the flow condition and agitation intensity (velocity gradient) that has the same reaeration coefficient using the correlation between the reaeration coefficient with the flow condition and reaeration coefficient with the agitation intensity. The circumstances in the sewer system was reproduced using batch reactor setting up the DO as a limiting condition from these results.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.1
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• pp.26-33
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• 2006

This study investigated the characteristics of the biofilm removal by free chlorine or monochloramine. The simulated drinking water distribution pipes on which biofilms had been formed were supplied with tap water containing 0.5, 1.0, 2.0 mg/L of free chlorine or monochloramine residuals. The biofilm removal was characterized by measurement of attached HPC and biomass on pipe surfaces. Chlorine was more effective in both inactivation of attached viable heterotrophic bacteria and removal of biofilm biomass compared to monochloramine. Biofilm matrix was not much eliminated from the surfaces by monochloramine disinfection. Free chlorine residual of 2.0 mg/L was found to be effective in biomass removal. However, biofilm level as low as $10CFU/cm^2$ of attached HPC and $5{\mu}g/cm^2$ of biomass still remained on the surfaces at 2.0 mg/L of chlorine residual. The measurement of biomass appeared to be a useful means in evaluating the characteristics of biofilm removal.