Caractérisation des eaux usées de débordements de réseau unitaire

1985 ◽  
Vol 12 (3) ◽  
pp. 527-537 ◽  
Author(s):  
Paul Lessard ◽  
Pierre Lavallée
Keyword(s):  
Water Quality ◽  
Rain Event ◽  
Combined Sewer Overflows ◽  
Drainage Basins ◽  
Combined Sewer ◽  
Different Types ◽  
Rain Events ◽  
The Impact ◽  
The City

In 1981, the City of Québec signed a protocol with the Québec Ministry of Environment permitting the study of the impact of combined sewer overflows (CSO) during rain periods on the St-Charles River. One of the main study objectives was to characterize CSO, both quantitatively and qualitatively. Five main drainage basins, representative of the study area, were selected and sampled during nine rain events. Certain appraisals were made to explain the importance of the water quality variations during rain events in combined sewers, dry weather period influence on runoff quality, and "first-flush" phenomenon. Two principal conclusions have been drawn from these data: (1) the major part of the pollutant load routed through a combined sewer network during a rain event is generated by surface runoff and dragging of sewage deposits and (2) the overall water quality of CSO doesn't seem to vary much from one basin to another, even if the percentages associated with different types of land use (residential, commercial, industrial, etc.) are different. Key words: urban runoff, combined sewer overflow, rainfall, quality, concentration, load.

Considering the impact of intermittent discharges when modelling overflows

1998 ◽  
Vol 38 (10) ◽  
pp. 23-30
Author(s):  
Sarah Jubb ◽  
Philip Hulme ◽  
Ian Guymer ◽  
John Martin
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Preliminary Investigation ◽  
Oxygen Demand ◽  
Sediment Oxygen Demand ◽  
Combined Sewer Overflows ◽  
River Hydraulics ◽  
Combined Sewer ◽  
The Impact ◽  
Curve Equation

This paper describes a preliminary investigation that identified factors important in the prediction of river water quality, especially regarding dissolved oxygen (DO) concentration. Intermittent discharges from combined sewer overflows (CSOs) within the sewerage, and overflows at water reclamation works (WRW) cause dynamic conditions with respect to both river hydraulics and water quality. The impact of such discharges has been investigated under both wet and dry weather flow conditions. Data collected from the River Maun, UK, has shown that an immediate, transient oxygen demand exists downstream of an outfall during storm conditions. The presence of a delayed oxygen demand has also been identified. With regard to modelling, initial investigations used a simplified channel and the Streeter-Phelps (1925) dissolved oxygen sag curve equation. Later, a model taking into account hydrodynamic, transport and dispersion processes was used. This suggested that processes other than water phase degradation of organic matter significantly affect the dissolved oxygen concentration downstream of the location of an intermittent discharge. It is proposed that the dynamic rate of reaeration and the sediment oxygen demand should be the focus of further investigation.

Emission-immission based design of combined sewer overflows and treatment plant - the dresden case study

1997 ◽  
Vol 36 (8-9) ◽  
pp. 355-359
Author(s):  
L. Fuchs ◽  
D. Gerighausen ◽  
S. Schneider
Keyword(s):  
Treatment Plant ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
Set Up ◽  
The City

For the city of Dresden a general master plan was set up based on investigations of the hydraulic capacity of the sewer system, the loads from combined sewer overflow and the treatment plant. The total emission from combined sewer overflows and treatment plant was the main criteria for the analysis of the efficiency of different renovation alternatives. The effect of the different alternatives on the quality of the receiving waters was investigated with a water quality model and evaluated with different approaches.

scholarly journals A Detention Reservoir Reduced Combined Sewer Overflows and Bathing Water Contamination Due to Intense Rainfall

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3425
Author(s):  
Marco Romei ◽  
Matteo Lucertini ◽  
Enrico Esposito Renzoni ◽  
Elisa Baldrighi ◽  
Federica Grilli ◽  
...  
Keyword(s):  
Environmental Concern ◽  
Treatment Options ◽  
Heavy Rain ◽  
Rain Event ◽  
Storm Events ◽  
Combined Sewer Overflows ◽  
Bathing Water ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Impact

Combined sewer overflows (CSOs) close to water bodies are a cause of grave environmental concern. In the past few decades, major storm events have become increasingly common in some regions, and the meteorological scenarios predict a further increase in their frequency. Consequently, CSO control and treatment according to best practices, the adoption of innovative treatment solutions and careful sewer system management are urgently needed. A growing number of publications has been addressing the quality, quantity and types of available water management and treatment options. In this study, we describe the construction of an innovative detention reservoir along the Arzilla River (Fano, Italy) whose function is to store diluted CSO wastewater exceeding the capacity of a combined drain system. River water sampling and testing for microbial contamination downstream of the tank after a heavy rain event found a considerable reduction of fecal coliform concentrations, which would have compounded the impact of stormwater on the bathing site. These preliminary results suggest that the detention tank exerted beneficial environmental effects on bathing water by lowering the microbial load.

scholarly journals The Impacts of Climate Change and Porous Pavements on Combined Sewer Overflows: A Case Study of the City of Buffalo, New York, USA

2021 ◽  
Vol 3 ◽  
Author(s):  
Andrew Roseboro ◽  
Maria Nariné Torres ◽  
Zhenduo Zhu ◽  
Alan J. Rabideau
Keyword(s):  
Climate Change ◽  
New York ◽  
Combined Sewer Overflows ◽  
Aquatic Life ◽  
Impact Of Climate Change ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Impact ◽  
The City

Combined sewer overflows (CSOs) release pollutants collected in urban runoff into local waterways, impacting both aquatic life and human health. The impact of climate change on precipitation may result in an increase in the frequency and magnitude of heavy precipitation events, with a corresponding increase in CSO discharges. The installation of Green Infrastructure (GI) such as Porous Pavements (PP) is a resilient approach to mitigate CSO events. However, an understanding of the impact of climate change on CSO events and the effectiveness of GI practices is crucial for designing sustainable urban stormwater management systems. Using the Storm Water Management Model (SWMM), the performance of PP as a CSO abatement strategy was studied for the city of Buffalo, New York, USA. This paper used the Intensity-Duration-Frequency (IDF) curves for current (1970–1999) and future (2070–2099) design rainfall scenarios, with four rainfall durations (1, 6, 12, and 24 hours) and four return periods (2, 10, 50, and 100 years). The simulation results show that (1) current 100-year events generate CSO volumes similar to predicted 50-year events; (2) CSO volumes could increase by 11–73% in 2070–2099 compared to 1970–1999 when no GI intervention is performed; and (3) the installation of PP can reduce 2–31% of future CSO volume. This case study demonstrates the regional CSO challenges posed by climate change and supports the use of GI as a mitigation strategy.

Water Quality of Combined Sewer Overflows, Stormwater, and Streams, Omaha, Nebraska, 2006-07

2009 ◽  
Author(s):  
Jason R. Vogel ◽  
Jill D. Frankforter ◽  
David L. Rus ◽  
Christopher M. Hobza ◽  
Matthew T. Moser
Keyword(s):  
Water Quality ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Sewer Overflows

The impacts of discharges from two combined sewer overflows on the water quality of an urban watercourse

1997 ◽  
Vol 36 (8-9) ◽  
pp. 195-199 ◽  
Author(s):  
R. Mulliss ◽  
D. M. Revitt ◽  
R. B. E. Shutes
Keyword(s):  
Water Quality ◽  
Storm Event ◽  
Combined Sewer Overflows ◽  
Ecosystem Classification ◽  
Combined Sewer ◽  
Total Ammonia ◽  
Sewer Overflows ◽  
Urban Watercourse ◽  
The Uk

The impacts of combined sewer overflows and surface water outfalls on receiving water quality are assessed by comparing dry weather flow and storm event concentrations of dissolved oxygen, BOD, total and unionised ammonia, pH, dissolved copper and total zinc with those recommended by the River Ecosystem classification guidelines for freshwaters in the UK. The deteriorating conditions during wet weather are identified by water quality falling below the RE2 category for all monitored pollutants, other than dissolved copper, and reaching the most grossly polluted condition for BOD and total ammonia.

The Impact of Storm Sewage Discharges on the Ecology of a Small Urban River

1990 ◽  
Vol 22 (10-11) ◽  
pp. 163-171 ◽  
Author(s):  
J. Seager ◽  
R. G. Abrahams
Keyword(s):  
Water Quality ◽  
Physiological Responses ◽  
Quality Criteria ◽  
Water Quality Criteria ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
Sewage Discharges

Intermittent discharges of storm sewage from combined sewer overflows continue to be one of the principal causes of poor water quality in many urban rivers in the UK. Despite the persistent nature of this problem, very little attention has been given to the study of how discharges of varying magnitude, duration and frequency affect the ecological quality of receiving waters. This information is of critical importance for deriving meaningful water quality criteria for the control of intermittent pollution. This paper describes the results of a study which has been carried out on Pendle Water, a river which flows through the urban catchment of Burnley, Lancashire, UK. Both the chemical and biological quality of Pendle Water are adversely affected by storm sewage discharges during heavy rainfall events. The ecological investigation has been primarily concerned with impact of these episodic discharges on benthic invertebrate communities and physiological responses in fish. Quantitative sampling of macroinvertebrates has indicated that storm sewage discharges may have a significant impact on the structure and diversity of benthic communities in receiving waters. Physico-chemical properties of habitats appear to be altered in a way which tends to favour the proliferation of certain pollution-tolerant species and decrease the abundance of taxa intolerant of organic pollution. Insitu bioassays, including the WRc Mark III Fish Monitor, have been deployed to investigate physiological responses to storm events of different magnitude, duration and frequency. Results are discussed in relation to their application in the field validation of proposed water quality criteria for the control of intermittent pollution from combined sewer overflows.

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