Modelling oxygen deficits in the Seine River downstream of combined sewer overflows

2004 ◽  
Vol 173 (2-3) ◽  
pp. 177-196 ◽  
Author(s):  
Stéphanie Even ◽  
Michel Poulin ◽  
Jean-Marie Mouchel ◽  
Martin Seidl ◽  
Pierre Servais
Keyword(s):  
Combined Sewer Overflows ◽  
Seine River ◽  
Combined Sewer ◽  
Sewer Overflows

Priority substances in combined sewer overflows: case study of the Paris sewer network

2011 ◽  
Vol 63 (5) ◽  
pp. 853-858 ◽  
Author(s):  
J. Gasperi ◽  
S. Garnaud ◽  
V. Rocher ◽  
R. Moilleron
Keyword(s):  
Hazardous Substances ◽  
Local Source ◽  
Rain Event ◽  
Combined Sewer Overflows ◽  
Limit Of Quantification ◽  
Seine River ◽  
Pollutant Loads ◽  
Sewer Network ◽  
Combined Sewer ◽  
Sewer Overflows

This study was undertaken to supply data on both priority pollutant (PP) occurrence and concentrations in combined sewer overflows (CSOs). A single rain event was studied on 13 sites within the Paris sewer network. For each sample, a total of 66 substances, including metals, polycyclic aromatic hydrocarbons (PAHs), pesticides, organotins, volatile organic compounds, chlorobenzenes, phthalates and alkylphenols were analyzed. Of the 66 compounds analyzed in all, 40 PPs including 12 priority hazardous substances were detected in CSOs. As expected, most metals were present in all samples, reflecting their ubiquitous nature. Chlorobenzenes and most pesticides were never quantified above the limit of quantification, while the majority of the other organic pollutants, except DEHP (median concentration: 22 μg.l−1), were found to lie in the μg.l−1 range. For the particular rain event studied, the pollutant loads discharged by CSOs were evaluated and then compared to pollutant loads conveyed by the Seine River. Under the hydraulic conditions considered and according to the estimations performed, this comparison suggests that CSOs are potentially significant local source of metals, PAHs and DEHP. Depending on the substance, the ratio between the CSO and Seine River loads varied from 0.5 to 26, underscoring the important local impact of CSOs at the scale of this storm for most pollutants.

Transfer of Combined Sewer Overflows in the Seine River

1994 ◽  
Vol 29 (1-2) ◽  
pp. 209-217 ◽  
Author(s):  
L. Simon ◽  
M. A. Maldiney ◽  
J. M. Mouchel
Keyword(s):  
Critical Shear Stress ◽  
Field Measurements ◽  
Combined Sewer Overflows ◽  
Seine River ◽  
Vertical Diffusivity ◽  
Combined Sewer ◽  
Dissolved Matter ◽  
Order Of Magnitude ◽  
Sewer Overflows ◽  
Differential Advection

The understanding of transport and dispersion of combined sewer overflows (CSOs), containing both dissolved and paniculate matters, is a major component of a research program dealing with the assessment of impacts of CSOs on the Seine River. This study has combined field measurements and the development of modelling tools. The first experimental results stress the fact that predictions of the behaviour of dissolved matter require the use of a fully two-dimensional hydraulic model, because the dispersion process seems to strongly depend on geometrical features of the river - meanders and the differential advection they induce. Concerning the paniculate matter, it appears that different factors govern its downstream transport, namely, settling properties, critical shear stress, and vertical diffusivity. These factors may produce forces on particles of the same order of magnitude, but in opposite directions. Special experiments are needed to determine precisely how these forces combine.

Implementation of Hamilton-Wentworth Region’s Pollution Control Plan

1996 ◽  
Vol 31 (3) ◽  
pp. 453-472 ◽  
Author(s):  
M. Stirrup
Keyword(s):  
Wastewater Treatment ◽  
Pollution Control ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Control Measures ◽  
Storm Events ◽  
Combined Sewer Overflows ◽  
Control Plan ◽  
Combined Sewer ◽  
Sewer Overflows

Abstract The Regional Municipality of Hamilton-Wentworth operates a large combined sewer system which diverts excess combined sewage to local receiving waters at over 20 locations. On average, there are approximately 23 combined sewer overflows per year, per outfall. The region’s Pollution Control Plan, adopted by Regional Council in 1992, concluded that the only reasonable means of dealing with large volumes of combined sewer overflow in Hamilton was to intercept it at the outlets, detain it and convey it to the wastewater treatment plant after the storm events. The recommended control strategy relies heavily on off-line storage, with an associated expansion of the Woodward Avenue wastewater treatment plant to achieve target reductions of combined sewer overflows to 1–4 per year on average. The region has begun to implement this Pollution Control Plan in earnest. Three off-line detention storage tanks are already in operation, construction of a fourth facility is well underway, and conceptual design of a number of other proposed facilities has commenced. To make the best possible use of these facilities and existing in-line storage, the region is implementing a microcomputer-based real-time control system. A number of proposed Woodward Avenue wastewater treatment plant process upgrades and expansions have also been undertaken. This paper reviews the region's progress in implementing these control measures.

A STRATEGY FOR MONITORING THE IMPACTS OF COMBINED SEWER OVERFLOWS ON THE OHIO RIVER

1994 ◽  
Vol 30 (1) ◽  
pp. 167-175
Author(s):  
Alan H. Vicory ◽  
Peter A. Tennant
Keyword(s):  
National Policy ◽  
The United States ◽  
Ohio River ◽  
Combined Sewer Overflows ◽  
Treatment Technology ◽  
Design Storm ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Definition Of ◽  
And Control

With the attainment of secondary treatment by virtually all municipal discharges in the United States, control of water pollution from combined sewer overflows (CSOs) has assumed a high priority. Accordingly, a national strategy was issued in 1989 which, in 1993, was expanded into a national policy on CSO control. The national policy establishes as an objective the attainment of receiving water quality standards, rather than a design storm/treatment technology based approach. A significant percentage of the CSOs in the U.S. are located along the Ohio River. The states along the Ohio have decided to coordinate their CSO control efforts through the Ohio River Valley Water Sanitation Commission (ORSANCO). With the Commission assigned the responsibility of developing a monitoring approach which would allow the definition of CSO impacts on the Ohio, research by the Commission found that very little information existed on the monitoring and assessment of large rivers for the determination of CSO impacts. It was therefore necessary to develop a strategy for coordinated efforts by the states, the CSO dischargers, and ORSANCO to identify and apply appropriate monitoring approaches. A workshop was held in June 1993 to receive input from a variety of experts. Taking into account this input, a strategy has been developed which sets forth certain approaches and concepts to be considered in assessing CSO impacts. In addition, the strategy calls for frequent sharing of findings in order that the data collection efforts by the several agencies can be mutually supportive and lead to technically sound answers regarding CSO impacts and control needs.

Methods of Estimating the Discharge of Gross Solids from Combined Sewer Systems

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1295-1304 ◽  
Author(s):  
C. Jefferies
Keyword(s):  
Research Centre ◽  
Combined Sewer Overflows ◽  
Water Research ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Uk

Visible pollution discharged from two combined sewer overflows were studied using passive Trash Trap devices and the UK Water Research Centre Gross Solids Sampler. Relationships are presented for the number of visible solids and the mass of gross solids discharged during an event. The differences in the behaviour of the overflow types are reported on and they are categorised using the Trash Traps.

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