The Plant-Covered Retention Soil Filter (RSF): The Mechanical and Biological Combined Sewer Overflow (CSO) Treatment Plant

2006 ◽  
Vol 6 (1) ◽  
pp. 74-79 ◽  
Author(s):  
F.-B. Frechen ◽  
W. Schier ◽  
J. Felmeden
Keyword(s):  
Treatment Plant ◽  
Combined Sewer Overflow ◽  
Combined Sewer ◽  
Sewer Overflow

Application of Faecal Sterol Ratios in Sediments and Effluents as Source Tracers

2001 ◽  
Vol 36 (4) ◽  
pp. 781-792 ◽  
Author(s):  
Chris Marvin ◽  
John Coakley ◽  
Tatiana Mayer ◽  
Mitra Brown ◽  
Lina Thiessen
Keyword(s):  
Meteorological Data ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Pig Manure ◽  
Combined Sewer Overflow ◽  
Physical Measurements ◽  
Combined Sewer ◽  
Sewer Overflow

Abstract An analytical method to determine faecal sterols was developed and applied to the analysis of samples including pig manure, sewage treatment plant sludge and combined sewer overflow effluent. Compounds including coprostanol (5β-cholestan-3β-ol), epicoprostanol (5β-cholestan-3α-ol), cholesterol (cholestan-5-en-3β-ol) and dihydrocholesterol (cholestanol, 5α-cholestan-3β-ol) were quantified in these source samples and their relative ratios calculated to investigate their potential application as source tracers. A mean coprostanol:epicoprostanol ratio of 7.6 ± 1.17 was calculated for pig manure samples from three Ontario livestock operations. This ratio was much lower (approximately 1.8) for sewage treatment plant sludge while the ratio for a combined sewer overflow effluent was very high (approximately 70). This approach, with the addition of physical measurements (e.g., current velocities) and meteorological data, may assist in determination of the influence of shore-based activities, including sewage treatment and livestock operations, on aquatic systems.

scholarly journals Evaluating Cryptosporidium and Giardia concentrations in combined sewer overflow

2006 ◽  
Vol 4 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Russell D. Arnone ◽  
Joyce Perdek Walling
Keyword(s):  
Health Risks ◽  
Urban Areas ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
System Capacity ◽  
Combined Sewer Overflow ◽  
Water Contact ◽  
Detection Frequency ◽  
Combined Sewer ◽  
Sewer Overflow

Since the first identified Cryptosporidium outbreaks occurred in the 1980s and the massive 1993 Milwaukee, WI outbreak affected more than 400,000 people, the concern over the public health risks linked to protozoan pathogens Cryptosporidium and Giardia has grown. Cryptosporidium and Giardia, found in streams, rivers, groundwater, and soil, form hardy, disinfection-resistant oocysts and cysts. Both organisms are recognized causative agents of gastrointestinal illnesses linked to the consumption of contaminated surface or groundwater. This study, the first in a planned series to estimate the urban contribution to the total Cryptosporidium and Giardia receiving-water loads, focused on combined sewer overflow (CSO). CSOs are discharges of mixed untreated sewage and stormwater released directly into receiving waters during rainfall. This engineered relief is necessary to accommodate hydraulic strain when the combined rain and sanitary flows exceed the system capacity. Limited comprehensive data are available assessing the CSO discharge contribution as a source of these two pathogens. Works by States et al. and Gibson et al. each found Cryptosporidium and much greater Giardia concentrations in CSOs draining parts of Pittsburgh, PA. This project estimated the relative detection frequency and concentration of Cryptosporidium and Giardia in CSO. Analytical results were obtained using a modification of Method 1623, originally developed for much cleaner environmental samples. These data are useful for drinking water treatment plants located downstream of CSOs. It is also significant in determining the potential concentrations of parasites at treatment plant intakes and for assessing health risks for water contact and fishing activities. Commonly monitored indicator organisms (total coliform, fecal coliform, E. coli, Enterococcus, and fecal streptococcus), endospores, and selected physical and chemical parameters were analyzed to further describe the samples. CSO from urban areas was not found to be a significant contributor of Cryptosporidium, however, it was found to be a Giardia source.

Retention soil filters for the treatment of sewage treatment plant effluent and combined sewer overflow

2020 ◽  
Vol 699 ◽  
pp. 134426 ◽  
Author(s):  
Andrea F. Brunsch ◽  
Pedro Zubieta Florez ◽  
Alette A.M. Langenhoff ◽  
Thomas L. ter Laak ◽  
Huub H.M. Rijnaarts
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Combined Sewer Overflow ◽  
Combined Sewer ◽  
Sewer Overflow

scholarly journals Innovative monitoring of combined sewer overflow (CSO) quality in the Liguori catchnment (Cosenza, Italy)

2012 ◽  
Vol 47 (2) ◽  
pp. 178-185 ◽  
Author(s):  
Patrizia Piro ◽  
Marco Carbone ◽  
Giuseppina Garofalo
Keyword(s):  
Chemical Oxygen Demand ◽  
Treatment Plant ◽  
Treatment Strategies ◽  
Oxygen Demand ◽  
Combined Sewer Overflow ◽  
Planning Approach ◽  
Combined Sewer ◽  
Wet Weather ◽  
Wet Weather Flow ◽  
Sewer Overflow

Estimates of urban wet-weather flow pollutant loads are required to assess their impact on receiving waters and optimize wastewater treatment plant (WWTP) and combined sewer overflow (CSO) operations. In particular, a quantitative characterization of flow quality by means of fairly accurate monitoring is required for developing a rational planning approach and preferential treatment strategies. The main aim of this paper is to examine the qualitative–quantitative characteristics of wet-weather flow in an urbanized test catchment in Cosenza, Italy, and to compare three studied water quality constituent concentrations (total suspended solids (TSS), total chemical oxygen demand (CODt) and filtered chemical oxygen demand (CODf)) obtained by laboratory analyses to those measured by a UV/Vis spectrometer (‘spectrolyzer scan’), which represents a most modern and efficient spectrometric instrument requiring little maintenance. The results of such comparisons indicated the feasibility of using in situ spectroscopy to provide fairly accurate concentrations of the constituents studied, particularly in the case of CODt and CODf.

scholarly journals Citizens' Perception of Combined Sewer Overflow Spills into Bathing Coastal Areas

2021 ◽  
Vol 232 (9) ◽  
Author(s):  
Eduardo Martínez-Gomariz ◽  
Maria Guerrero-Hidalga ◽  
Edwar Forero-Ortiz ◽  
Susana Gonzalez
Keyword(s):  
Urban Areas ◽  
Treatment Plant ◽  
City Council ◽  
The Body ◽  
Main Concern ◽  
Combined Sewer Overflow ◽  
Council Decision ◽  
Combined Sewer ◽  
Awareness Programs ◽  
Sewer Overflow

AbstractOnce a wastewater treatment plant (WWTP) exceeds its capacity, it is necessary to discharge a proportion of the flow to watercourses through combined sewer overflow (CSO) structures. In coastal urban areas, CSO spills may occur in seawaters. The present study analyses the effects of these spills into urban coastal bathing areas, through a qualitative survey-based analysis in Badalona and Barcelona, focusing on stakeholders' reputation and image involved in the sewer system and beaches management (i.e. intangible damages) and the consequences for the economy (i.e. tangible damages). The direct relation between CSO spills and impacts on restaurants’ revenues is not observed since business owners in Badalona and Barcelona do not perceive any economic impact due to these events. Their main concern is the municipality’s image, which might affect the citizens’ view of the management of the responsible agents and indirectly, the tourist sector, especially in Barcelona. Residents perception in this matter is remarkably different in both cities. In Badalona, residents know the problem and even the body responsible for setting the red flag and the beaches closure (i.e. the municipality). In Barcelona, though, residents are quite confused about this. The complexity in terms of competencies in sewer systems management requires a better communication campaign for the citizens to avoid misunderstandings and unnecessary loss of trust in the City Council. Decision-makers and stakeholders should be interested in understanding the perception of affected users upon these events to take appropriate measures to enhance awareness programs or measures to reduce overflows.

Experience with Vortex Separators for Combined Sewer Overflow Control

1993 ◽  
Vol 27 (5-6) ◽  
pp. 93-104 ◽  
Author(s):  
H. Brombach ◽  
C. Xanthopoulos ◽  
H. H. Hahn ◽  
W. C. Pisano
Keyword(s):  
Separation Efficiency ◽  
Operational Reliability ◽  
Second Phase ◽  
Combined Sewer Overflow ◽  
Specific Storage ◽  
Impervious Area ◽  
Evaluation Phase ◽  
Combined Sewer ◽  
Sewer Overflow ◽  
Overflow Control

In 1987 the first vortex solids separator facility in Germany was installed for combined sewer overflow (CSO) control. The separation efficiency was optimized in the hydraulic laboratory using scaled down models with artificial tracers to simulate typical sewage particulates. The station has two parallel operating vortex separators and serves a connected and impervious area of about 11 hectares (ha) and 1,500 people. The specific storage volume of the station is 7.2 m3 per ha. Two evaluation programs were conducted. The first evaluation phase noted the operational reliability, hydraulic loads, overflow frequencies and water mass balances. The second phase monitored separation efficiencies. The evaluation showed that vortex solids separators are now ready for use in CSO control.

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