Temporal analysis of E. coli, TSS and wastewater micropollutant loads from combined sewer overflows: implications for management

2015 ◽  
Vol 17 (5) ◽  
pp. 965-974 ◽  
Author(s):  
Madoux-Humery Anne-Sophie ◽  
Sarah M. Dorner ◽  
Sébastien Sauvé ◽  
Khadija Aboulfadl ◽  
Martine Galarneau ◽  
...  
Keyword(s):  
Treatment Options ◽  
Temporal Analysis ◽  
Combined Sewer Overflow ◽  
Combined Sewer Overflows ◽  
E Coli ◽  
Snowmelt Period ◽  
Combined Sewer ◽  
Different Seasons ◽  
Mass Loads ◽  
The Impact

A combined sewer overflow (CSO) outfall was monitored during different seasons (including the snowmelt period) to assess the impact ofE. coli, TSS and WWMP temporal mass loads on the appropriateness of treatment options.

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.

Development of a Methodology to Determine the Pollution Discharged by a Combined Sewer Network

1990 ◽  
Vol 22 (10-11) ◽  
pp. 15-22 ◽  
Author(s):  
M. Cherrered ◽  
B. Chocat
Keyword(s):  
Urban Runoff ◽  
Pollution Source ◽  
Relative Effect ◽  
Actual State ◽  
Combined Sewer Overflow ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflow ◽  
The Impact

Until a few years ago, there was not much research in France into Combined Sewer Overflow phenomena in storm weather. The water of urban runoff has always been considered “clean” and one considered that the dilution of dry weather flows in storm water decreased the impact of the pollution generated by overflows. Now, with increased urban development and realization of the importance of pollution caused by urban runoff, the problem can be considered differently. Indeed, some quality studies of receiving waters show that combined sewer networks represent an important pollution source for the natural environment, due to the increasing relative effect of combined sewer overflow discharge into receiving waters. Thus, combined sewer overflows have until recently been the least known part of the sewer system. In this present communication, methodology to estimate combined overflows has been elaborated after exploitation of data resulted from ten French real case studies where such problems were observed. This study has been realized in four steps:- A bibliography study to discover the actual state of the problem in terms of existent methods concerning both experimentation and modelling and to define the needs of the research.- Ten French studies have been selected, analysed, and used to define the different methods used, and to show methodological lacunas from the observations and results realized. Elements of improvement have been proposed.- Methods and new propositions have been defined and a coherent methodological diagram has been realized to compare and test these methods.- Computer tools have been conceived and tested in the ten study cases.

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.

Pilot-Scale Study of Satellite Treatment Options for the Control of Combined Sewer Overflows

1997 ◽  
Vol 32 (1) ◽  
pp. 169-184 ◽  
Author(s):  
J. SCHMIDT ◽  
P. SETO ◽  
D. Averill
Keyword(s):  
Treatment Options ◽  
Cost Effective ◽  
Pilot Scale ◽  
Combined Sewer Overflows ◽  
International Joint Commission ◽  
Pollution Problem ◽  
Combined Sewer ◽  
Vortex Separator ◽  
Sewer Overflows ◽  
Screen Performance

Abstract Combined sewer overflows (CSOs) have been recognized for many years as a pollution problem within the Great Lakes ecosystem. CSOs were identified as a source of contamination in 10 of the 17 Canadian “Areas of Concern” designated by the International Joint Commission, and were considered a major problem in Hamilton Harbour and the Metropolitan Toronto Waterfront. Satellite treatment systems (located upstream in the sewerage system) were identified as being significantly more cost effective than other CSO control options in a feasibility study conducted for Metropolitan Toronto. Consequently, a multi-agency initiative was established in 1993 to examine the treatment of CSOs at a pilot-scale facility in the City of Scarborough. The technologies evaluated during two experimental seasons in 1994 and 1995 included a vortex separator, a circular clarifier, a horizontal-flow plate clarifier and an inclined rotary drum screen. Performance of the technologies is being assessed against a draft policy proposed by the Ontario Ministry of Environment and Energy. Results to date have indicated that the vortex separator and the plate clarifier under “best conditions” were capable of 50% TSS removal and 30% BOD5 removal and should be capable of satisfying the policy.

scholarly journals Intensive monitoring of conventional and surrogate quality parameters in a highly urbanized river affected by multiple combined sewer overflows

2018 ◽  
Vol 19 (3) ◽  
pp. 953-966 ◽  
Author(s):  
D. Copetti ◽  
L. Marziali ◽  
G. Viviano ◽  
L. Valsecchi ◽  
L. Guzzella ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Laboratory Data ◽  
Quality Parameters ◽  
Nutrient Concentrations ◽  
Combined Sewer Overflows ◽  
Continuous Measurements ◽  
Combined Sewer ◽  
Early Peak ◽  
Sewer Overflows ◽  
The Impact

Abstract The paper reports results of four intensive campaigns carried out on the Seveso River (Milan metropolitan area, Italy) between 2014 and 2016, during intense precipitation events. Laboratory analyses were coupled with on-site, continuous measurements to assess the impact of pollutants on water quality based on both conventional and surrogate parameters. Laboratory data included total suspended solids, caffeine, total phosphorus and nitrogen, and their dissolved forms. Screening of trace metals (Cr, Cu, Pb, Ni, Cd) and PBDEs (polybromodiphenylethers) was carried out. Continuous measurements included water level, physico-chemical variables and turbidity. Nutrient concentrations were generally high (e.g. average total phosphorus > 1,000 μg/L) indicating strong sewage contributions. Among monitored pollutants Cr, Cu, Pb, and Cd concentrations were well correlated to TSS, turbidity and discharge, being bound mostly to suspended particulate matter. A different behavior was found for Ni, that showed an early peak occurring before the flow peak, as a result of first flush events. PBDEs correlated well to nutrient concentrations, showing the highest peaks soon after activation of the combined sewer overflows, likely because of its accumulation in sewers. In addition to showing the existing correlations between quality parameters, the paper highlights the importance of surrogate parameters as indicators of anthropic pollution inputs.

Aerobic microbial transformations of pipe and silt trap sediments from combined sewers

1999 ◽  
Vol 39 (2) ◽  
pp. 233-249 ◽  
Author(s):  
Jes Vollertsen ◽  
Thorkild Hvitved-Jacobsen ◽  
Iain McGregor ◽  
Richard Ashley
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Conceptual Model ◽  
Combined Sewer Overflow ◽  
Organic Fraction ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Oxygen Utilisation ◽  
Fast Settling ◽  
The Impact

Organic matter in sediments from pipes and silt traps in combined sewers was divided into fractions with different settling velocities. Biodegradability of organic matter for these fractions was characterised based on results from a conceptual model of aerobic transformations of resuspended sediments calibrated on oxygen utilisation rates. Pipe sediments as well as silt trap sediments were investigated and no differences between these deposits were detected. It was found that the largest fraction of organic matter is associated with material which settles relatively fast and only a small part is associated with relatively slow settling material. However, the fast settling organic matter was found to be rather slowly biodegradable compared to the slow settling organic fraction. Because the biodegradability of the organic matter discharged during combined sewer overflow (CSO) events is of significant importance to the impact on the dissolved oxygen concentrations in receiving waters, the biodegradability of sewer sediments is argued to be taken into account for detailed characterisation when dealing with CSO impacts.

The feasibility of flocculation in a storage sedimentation basin

1999 ◽  
Vol 39 (2) ◽  
pp. 75-83 ◽  
Author(s):  
W. De Cock ◽  
P. Blom ◽  
G. Vaes ◽  
J. Berlamont
Keyword(s):  
Numerical Model ◽  
Velocity Gradient ◽  
Settling Velocity ◽  
Pollution Load ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Efficiency Increase ◽  
Receiving Waters ◽  
Sedimentation Basins ◽  
The Impact

For the Flemish situation, storage sedimentation basins are one of the best ‘end-of-pipe’ solutions to reduce the impact of combined sewer overflows on the receiving waters. In some cases, when the spilled pollution load is too high, the settling efficiency of the basin has to be improved. Adding coagulants could be a reasonable alternative for building larger basins. To estimate the effect of enhancing the settling by flocculation, a floc growth and break-up model is worked out and is implemented in the numerical model Phoenics. The evolution of the floc dimensions and the sedimentation behaviour of the particles in the basin is calculated for different inflow rates and initial settling velocity profiles. Finally, the efficiency increase by mixing (creating a higher velocity gradient) in the agitation chamber or by adding coagulants in the trunk sewer upstream of the basin is also investigated.

Modelling total suspended solids, E. coli and carbamazepine, a tracer of wastewater contamination from combined sewer overflows

2015 ◽  
Vol 531 ◽  
pp. 830-839 ◽  
Author(s):  
Khemngeun Pongmala ◽  
Laurène Autixier ◽  
Anne-Sophie Madoux-Humery ◽  
Musandji Fuamba ◽  
Martine Galarneau ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Total Suspended Solids ◽  
Combined Sewer Overflows ◽  
E Coli ◽  
Combined Sewer ◽  
Sewer Overflows

Survival of Indicator Organisms in a Detention Pond Receiving Combined Sewer Overflow

1987 ◽  
Vol 19 (3-4) ◽  
pp. 547-555 ◽  
Author(s):  
Lambertus Lijklema ◽  
Barbara Habekotté ◽  
Christine Hooijmans ◽  
Roelof H. Aalderink ◽  
Arie H. Havelaar
Keyword(s):  
Pathogenic Bacteria ◽  
Removal Rate ◽  
Indicator Bacteria ◽  
Combined Sewer Overflow ◽  
Indicator Organisms ◽  
Combined Sewer Overflows ◽  
Short Period ◽  
Combined Sewer ◽  
Detention Pond ◽  
Better Than

Removal of four groups of indicator bacteria and two groups of bacteriophages in a detention pond receiving Combined Sewer Overflows (CSO) were measured. Also the survival of the bacteria in the sediments was studied. The overall removal rate of the bacteria tended to be somewhat higher than the removal rate for phages. Most values were in the range of 0.7 - 1.0 per day (e-basis). Sedimentation was of limited importance except for a short period following the overflow event. Dilution contributed in a reduction of 0.3 - 0.4 per day and die-off rates were about 0.3 - 0.6 per day, for phages maybe as low as 0.2 per day. Survival of the bacteria in the sediment was much better than in the water, net loss rates were about 0.1 per day, resulting in a more or less continuous contamination of the sediment with pathogenic bacteria as represented by indicator organisms.

Source tracking ofEscherichia coliby 16S–23S intergenic spacer region denaturing gradient gel electrophoresis (DGGE) of therrnBribosomal operon

2007 ◽  
Vol 53 (10) ◽  
pp. 1174-1184 ◽  
Author(s):  
Thomas V. D’Elia ◽  
Chester R. Cooper ◽  
Carl G. Johnston
Keyword(s):  
Escherichia Coli ◽  
Gel Electrophoresis ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Intergenic Spacer ◽  
Source Tracking ◽  
Combined Sewer Overflow ◽  
Intergenic Spacer Region ◽  
E Coli ◽  
Combined Sewer ◽  
Gradient Gel Electrophoresis

This research validates a novel approach for source tracking based on denaturing gradient gel electrophoresis (DGGE) analysis of DNA extracted from Escherichia coli isolates. Escherichia coli from different animal sources and from river samples upstream from, at, and downstream of a combined sewer overflow were subjected to DGGE to determine sequence variations within the 16S–23S intergenic spacer region (ISR) of the rrnB ribosomal operon. The ISR was analyzed to determine if E. coli isolates from various animal sources could be differentiated from each other. DNA isolated from the E. coli animal sources was PCR amplified to isolate the rrnB operon. To prevent amplification of all 7 E. coli ribosomal operons by PCR amplification using universal primers, sequence-specific primers were utilized for the rrnB operon. Another primer set was then used to prepare samples of the 16S–23S ISR for DGGE. Comparison of PCR–DGGE results between human and animal sources revealed differences in the distribution and frequency of the DGGE bands produced. Human and Canada Goose isolates had the most unique distribution patterns and the highest percent of unique isolates and were grouped separately from all other animal sources. Method validation suggests that there are enough host specificity and genetic differences for use in the field. Field results at and around a combined sewer overflow indicate that this method can be used for microbial source tracking.

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