Addressing the challenges of combined sewer overflows

Perry, William Bernard; Ahmadian, Reza; Munday, Max; Jones, Owen; Ormerod, Steve J.; Durance, Isabelle

doi:10.1016/j.envpol.2023.123225

Cited by 15 publications

(7 citation statements)

References 175 publications

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“…Hydraulic models offer an effective means to simulate drainage processes in stormwater and sewage systems, enabling precise identification of operational risks within pipe networks [24]. However, prevailing studies often construct separate hydraulic models for stormwater and sewage, overlooking the compounding effects of mixed flow between stormwater and sewage on their respective risks [25]. Moreover, combined sewer systems are typically examined in isolation, neglecting their interaction with stormwater and sewage systems [26].…”

Section: Introductionmentioning

confidence: 99%

Operation Risk Simulation and Interaction Impact of Stormwater and Sewage Systems Based on Storm Water Management Model

Li,

Wang,

Zhou

et al. 2024

Water

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With the increasing urbanization rate, higher demand is placed on drainage systems, necessitating analysis of their risk profiles. While many studies focus on the individual hydraulic modeling of stormwater and wastewater systems when considering operational risks, they often overlook the exacerbating effects of combined stormwater and wastewater flows on each other’s risks. In this study, we constructed a model of the combined stormwater and wastewater drainage system in Lijiao, Guangdong Province. We analyzed the operational risks of both stormwater and sewage networks in different scenarios, focusing on full-load pipes, overload pipes, node overflows, and minimum flow velocities. Furthermore, we compared the exacerbating effects of sewage and stormwater on each other’s network operational risks. Simulation results indicated that, for sewage networks with combined sewer sections, the lengths of full-load pipes and overload pipes increased by an average of 27.4% and 16.3%, respectively, during rainy weather scenarios compared to dry weather. After considering the inflow of sewage into combined sewer sections, the average length of full-load pipes increased by 3.8 km, overload pipe length increased by 1.1 km, and overflow volume increased by 2.26 × 104 m3. As the return period of rainfall events increases, these inter-system impacts gradually diminish. Therefore, when modeling drainage systems and assessing operational risks, particularly during low return period rainfall events, the inclusion of both stormwater and sewage in combined sewer networks should be comprehensively considered.

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Section: Introductionmentioning

confidence: 99%

Operation Risk Simulation and Interaction Impact of Stormwater and Sewage Systems Based on Storm Water Management Model

Li,

Wang,

Zhou

et al. 2024

Water

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“…Wastewater can be lost by seepage or can spill into the natural environment through combined sewer overflows (CSOs). CSOs are active during times of high flow, when the capacity of the wastewater network has been reached, and prevent wastewater backing-up into properties (Perry et al [10]). Wastewater can also be temporarily diverted to storage tanks.…”

Section: Introductionmentioning

confidence: 99%

Estimating Wastewater Dilution Using Chemical Markers and Incomplete Flow Measurements: Application to Normalisation of SARS-CoV-2 Measurements

Jones,

Baldwin,

Perry

et al. 2024

Preprint

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We construct a Bayesian estimator for the dilution of a wastewater sample, and use it to estimate the prevalence of SARS-CoV-2 in Wales using data from the Wales Environmental Wastewater Analysis and Surveillance for Health project (WEWASH). In Wales wastewater is diluted by rainwater so an estimate of the level of dilution is required if we are to normalise sample measurements of disease markers such as SARS-CoV-2 RNA. We consider the situation where flow measurements are available, but will regularly be unreliable because of the action of combined sewer outflows, which divert wastewater away from treatment plants when the flow is excessive. However we also have proxies for the flow from various chemical markers, whose level per unit of population is fixed. The new estimator has multiple advantages compared to existing procedures: credible intervals for the estimates; optimal weighting of the chemical markers; systematic handling of missing and censored values; and model based smoothing without lags.

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“…These contaminants include triclosan from shampoos, soaps, and toothpastes 14 ; pharmaceuticals, such as erythromycin, fluoxetine, and diclofenac 15 ; per- and polyfluoroalkyl substances 16 ; diethylhexyl phthalate leaching from polyvinyl chloride piping 17 ; and pesticides and nutrients from agricultural and gardening activities. 18 Wastewaters from urban, rural, and industrial sources differ in their composition and are of concern for acute vs. chronic health effects depending on their source. 19 …”

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confidence: 99%

“…When comparing green and gray infrastructure projects, the former may be preferable because they can have socioeconomic, environmental, and community benefits, such as restoration of biodiversity and ecosystem services; increased real estate values; opportunities for increased tourism and leisure activity; and improved public health. 18 Gray infrastructure projects, on the other hand, while effective, are encumbered by high costs and carbon footprints. 18 Embracing green and community-centered approaches not only safeguards public health but also advances systemic resilience to climate change.…”

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confidence: 99%

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Invited Perspective: Toward Resilience—Community-Based Approaches to Managing Combined Sewer Overflows in a Changing Climate

Semenza

2024

Environ Health Perspect

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Addressing the challenges of combined sewer overflows

Cited by 15 publications

References 175 publications

Operation Risk Simulation and Interaction Impact of Stormwater and Sewage Systems Based on Storm Water Management Model

Operation Risk Simulation and Interaction Impact of Stormwater and Sewage Systems Based on Storm Water Management Model

Estimating Wastewater Dilution Using Chemical Markers and Incomplete Flow Measurements: Application to Normalisation of SARS-CoV-2 Measurements

Invited Perspective: Toward Resilience—Community-Based Approaches to Managing Combined Sewer Overflows in a Changing Climate

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