RESEARCH ON LAYOUT OF INTERCEPTION COMBINED SEWER OVERFLOW DETENTION TANKS BASED ON THEIR LIFE CYCLE CARBON EMISSIONS
Detention tanks are crucial facilities in urban water environment management.Currently,the engineering application of interception-type combined sewer overflow(CSO)detention tanks primarily focuses on pollutant reduction efficiency,cost,and land use,with limited consideration on carbon emissions and overall benefits analysis.To further investigate the relationship between the pollutant reduction effectiveness of detention tanks and their carbon emissions,this study,taking a city in central Jiangsu province as a case,conducted field monitoring of CSO and utilized the Storm Water Management Model(SWMM)to establish a CSO pollution calculation model.The model simulated the pollutant control effects of end-of-pipe centralized detention tanks and distributed detention tanks of various sizes along the drainage system.Based on these simulations,the study calculated the life cycle carbon emissions for each scheme.The results indicated that although distributed detention tanks were more effective at pollutant reduction,resulting in higher overall carbon emissions.Moreover,as the size of the detention tanks increased,the carbon emission increment of the distributed detention tanks further exceeded that of the centralized detention tanks.These findings provide a reference for the green development of urban water systems and the achievement of carbon reduction goals.It is recommended that future design and construction of urban CSO detention tanks comprehensively consider energy conservation,emission reduction,and efficiency improvement to maximize their overall benefits.
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