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Identification of high oxygen-consuming substances in stormwater drainage systems illicitly connected with sewage system

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Journal of Environmental Sciences 2024年第4期138卷 132-140页

作者： Chen Xu Zuxin Xu Wenhai Chu Shanshan Wu Rong Xiao Lei Su State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China Guangzhou Resource Environmental Protection Technology Co. Ltd.Guangzhou 510030China

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment,and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological environment.When a water body is anoxic,the activity of anaerobic microorganisms increases and organic matter is decomposed to produce a large number of blackening and odorizing substances,resulting in black and odorous water bodies,which is a very common and typical phenomenon in China.Presently,there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urban drainage pipe network in China,which makes oxygen-consuming substances be directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water bodies,resulting in an oxygen deficiency of the water.This induces seasonal or year-round black and stink phenomena in urban rivers.Hence,identifying high oxygen-consuming substances,which lays the foundation for the subsequent removal of oxygen-consuming substances,is essential.Through a series of comparisons of water quality indicators and analysis of organic characteristics,it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study,and the oxygen-consuming substances of domestic sewage were small molecular amino acids.By comparing 20 conventional free amino acids,it was found that seven of them consumed oxygen easily,and compared with chemical oxygen consumption,biological oxygen consumption was in a leading position.

关键词： urban drainage system Oxygen-consuming substances Domestic sewage Amino acid

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

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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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An integrated assessment method of urban drainage system:A case study in Shenzhen City,China

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Frontiers of Environmental Science & Engineering 2008年第2期2卷 150-156页

作者： Xin DONG Siyu ZENG Jining CHEN Dongquan ZHAO Department of Environmental Science&Engineering Tsinghua UniversityBeijing 100084China

In recent years,the urban drainage system in China is facing the dual pressure of renovation and construction.This requires that the integrated assessment for the planning and operation of the urban drainage system is obligatory.To evaluate the urban drainage system,an integrated assessment methodology based on the analytic hierarchy process(AHP),integrated simulation,and fuzzy assessment is established.This method is a multi-criteria decision adding app roach to the assessment of the urban drainage system comprehensively.Through the integration of the Storm Water Management Model(SWMM),a simple wastewater treatment plant model,and a surface water quality model,an integrated modelling system for the urban drainage system is developed and applied as a key tool for assessment.Using the established method,a case study in Shenzhen City has been implemented to evaluate and compare two urban drainage system reno vation plans,the distributed plan and the centralized plan.Because of the particularity of this case study,the established method is not applied entirely.Considering the water environ mental impact,ecological impact,technological feasibility,and economic cost,the integrated performance of the distri buted plan is better.As shown in this case study,the proposed method is found to be both effective and practical.

关键词： analytic hierarchy process(AHP) centralized plan distributed plan fuzzy assessment integrated assessment integrated simulation urban drainage system

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BASIC THEORY AND MATHEMATICAL MODELING OF urban RAINSTORM WATER LOGGING

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Journal of Hydrodynamics 2004年第1期16卷 17-27页

作者： LIDa-ming ZHANGHong-ping LIBing-fei XIEYi-yang SchoolofCivilEngineering TianjinUinversityTianjin300072.China TianjinInstituteofMeteorologicalSciences Tianjin300074China

In this paper, a mathematical model for the urban rainstorm water logging wasestablished on the basis of one- and two-dimensional unsteady flow theory and the technique ofnon-structural irregular grid division. The continuity equation was discretized with the finitevolume method. And the momentum equations were differently simplified and discretized for differentcases. A method of ''special passage'' was proposed to deal with small-scale rivers and open channels.The urban drainage system was simplified and simulated in the model. The method of ''open slot'' wasapplied to coordinate the alternate calculation of open channel flow and pressure flow in drainagepipes. The model has been applied in Tianjin City and the verification is quite satisfactory.

关键词： urban rainstorm water logging urban drainage system mathematical model unsteady flow theory non-structural irregular grids finite volume method

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