Comparative Assessment of Urban Drainage Systems in Different Cities Based on Substance Flow Analysis

Abstract:

In this paper the substance flow analysis (SFA) method was employed to map the water, COD-C, TN-N flows in urban drainage system, focusing on the pathways of contaminants to urban water environment. As case studies, four cities were selected for the comparative assessments using the statistical data of 2011.Through examining the fluxes of three sources (effluent of WWTPs, wastewater discharged without treatment, and urban storm runoff) of COD-C and TN-N emission, analysis and discussionwere made based on different units of measurements.The results showed that the load of COD-C was in the range of 16.50~80.25 kg/y/capand 131.44~227.58 t/y/km², and TN-Nwas in the range of 1.20~5.43 kg/y/capand 9.57~23.18 t/y/km².Taking considerations ofproportional relationship among the three origins, urban storm runoff released the majority of COD-C to receiving water, accounting more than 60% of the total. For TN-N flows, effluent of WWTPs and urban storm runoff wereidentified as the major contributors, accumulated contribution of 85%.Thus, the outcomes from these substance flow analyses, suggested that a reduction in pollution could be achieved by improvingstormwater management and upgrading emission standard of WWTPs, and proved itself as an effective tool for urban wastewater management as well.

• Periodical: Advanced Materials Research (Volume 742)
• Pages: 290-299
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.742.290
• Online since: August 2013
• Authors: Hua Bai, Si Yu Zeng, Xin Dong, Ji Ning Chen
• Keywords: Comparative Assessment, Substance Flow Analysis, Urban Drainage System, Water Pollution Control

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