오수관거 내의 오염물질 변화에 관한 모델링

Abstract

Contaminats move to the wastewater treatment plant through the sewer systems. Simultaneously, while floowing, contaminants are disminished in sewer systems. This is due to the physical, chemical, and biological reactions while wastewater is flowing: the sedimentation of solid particles and the decomposition of contaminats caused by microbes living in wastewater or the pipe wall. This reactions makes the composition of raw water be changed before wastewater reaches the wastewater treatment plant, thus it influences the efficiency of wastewater treatment directly or indirectly. In this study focused on organic matters, nutrients, and sulfides in order to predict the change of contaminants which is occurred while sewage flows in sanitary sewer. Also we simulated modeling applied to ASM1(Activated Sludge Models No. 1). When the velocity is constant at 1m/s and sewage flows for 24 hours, in the organic matter's concern, TCOD is 375mg/L at upstream and 330mg/L at downstream, showing 12% decrease. Also, SCOD is 170mg/L at upstream and 122mg/L at downstream, showing 28% decrease. To represent nutrients, TKN records 39mg/L at upstream and reduces 4mg/L, 35mg/L at downstream. In terms of sulfides, sulfer ions decrease by 60%, 12mg/L downstream from 30mg/L upstream. Consequently, hydrogen sulfide increases to 4mg/L and 2mg/L is emitted.