TY - JOUR

T1 - Effect of rainfall characteristics on the sewer sediment, hydrograph, and pollutant discharge of combined sewer overflow

AU - Yu, Dawei

AU - Dian, Liu

AU - Hai, Yonglong

AU - Randall, Mark T.

AU - Liu, Li

AU - Liu, Jibao

AU - Zhang, Junya

AU - Zheng, Xiang

AU - Wei, Yuansong

N1 - Funding Information: The work was funded by Major Science and Technology Program for Water Pollution Control and Treatment of China (2017ZX0710202-001), China Europe Water Platform (CEWP) Lot 3 Water and Urbanization (PI/2017/382?116). All the authors would like to acknowledge Professor Peter Engelund Holm from University of Copenhagen, for pre-peer reviewed the manuscript. Funding Information: The work was funded by Major Science and Technology Program for Water Pollution Control and Treatment of China ( 2017ZX0710202-001 ), China Europe Water Platform (CEWP) Lot 3 Water and Urbanization ( PI/2017/382–116 ). All the authors would like to acknowledge Professor Peter Engelund Holm from University of Copenhagen, for pre-peer reviewed the manuscript. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2022

Y1 - 2022

N2 - Significant management needs raised in urban sewer system to facilitate urban resilience to rainstorm. The work investigated the effects of temporal evolution of rainfall on hydrograph and pollutant discharge of CSO over an intensive observation period of 12 months, with special attention to differences in temporal scale for supporting management decision making. The characteristics of rainfall in different temporal scales helped overflow-risk identification and assessment. Prolonged dry seasons over 112 days in the CSO monitored year 2018 increased the sediment buildup in the pipes. The built sediment was mostly flushed out to overflow (and the treatment facility) by initial rainfall during 47 h. Following CSO hydraulics and pollutant discharge follows initial peak patterns which responded to rainfall patterns. Results of Redundancy analysis and network analysis showed that the combined effects of rainfall, urbanization, and sediments as “CSO troika” are the driving forces for CSO pollutants in the long-term. The improved characterization of CSO events and the associated pollutants has refined our understanding of how overflow hydrograph and pollutant discharge responds to rainfall temporally, which methodology supported decision making in the combining source/process control with terminal management for facilizing urban resilience.

AB - Significant management needs raised in urban sewer system to facilitate urban resilience to rainstorm. The work investigated the effects of temporal evolution of rainfall on hydrograph and pollutant discharge of CSO over an intensive observation period of 12 months, with special attention to differences in temporal scale for supporting management decision making. The characteristics of rainfall in different temporal scales helped overflow-risk identification and assessment. Prolonged dry seasons over 112 days in the CSO monitored year 2018 increased the sediment buildup in the pipes. The built sediment was mostly flushed out to overflow (and the treatment facility) by initial rainfall during 47 h. Following CSO hydraulics and pollutant discharge follows initial peak patterns which responded to rainfall patterns. Results of Redundancy analysis and network analysis showed that the combined effects of rainfall, urbanization, and sediments as “CSO troika” are the driving forces for CSO pollutants in the long-term. The improved characterization of CSO events and the associated pollutants has refined our understanding of how overflow hydrograph and pollutant discharge responds to rainfall temporally, which methodology supported decision making in the combining source/process control with terminal management for facilizing urban resilience.

KW - Combined sewer overflow

KW - Hydrograph

KW - Pollutant discharge

KW - Rainfall

KW - Sewer sediment

U2 - 10.1016/j.jenvman.2021.114268

DO - 10.1016/j.jenvman.2021.114268

M3 - Journal article

C2 - 34894491

AN - SCOPUS:85120888607

VL - 303

JO - Journal of Environmental Management

JF - Journal of Environmental Management

SN - 0301-4797

M1 - 114268

ER -