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Substance flow analysis for an urban drainage system of a representative hypothetical city in China

Frontiers of Environmental Science & Engineering 2013年第5期7卷 746-755页

作者： Hua BAI Siyu ZENG Xin DONG Jining CHEN School of Environment Tsinghua University Beijing 100084 China

This paper discusses the use of substance flow analysis （SFA） as a tool to support quantified research on urban drainage systems. Based on the principle of mass balance, a static substance flow model is established to describe and examine the routes and intensities of water, chemical oxygen demand （COD）, total nitrogen （TN） and total phosphorus （TP） for a representative hypothetical city （RH city） in China, which is a devised and scaled city using statistical characteristics of urban circumstances at the national level. It is estimated that the annual flux of water, COD, TN and TP through the urban drainage system in 2010 was 55.1 million m3, 16037.3 t, 1649.5 t and 209.7 t, respectively. The effluent of wastewater treatment plant （WWTP） was identified as the most important pathway for pollutant emissions, which con- tributed approximately 60% of COD, 65% of TN and 50% of TP to receiving water. During the wastewater treatment process, 1.0 million m3, 7042.5 t, 584.2 t and 161.4 t of the four studied substances had been transmitted into sludge, meanwhile 3813.0 t of COD and 394.0 t of TN were converted and emitted to the atmosphere. Compared with the representative hypothetical city of 2000, urban population and the area of urban built districts had expanded by approximately 90% and 80% respectively during the decade, resulting in a more than threefold increase in the input of substances into the urban drainage system. Thanks to the development of urban drainage systems, the total loads of the city were maintained at a similar level.

关键词： substance flow analysis (SFA) urban drainage system representative hypothetical city (RH city) waterpollution control

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