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Ghassan Chebbo - One of the best experts on this subject based on the ideXlab platform.

  • assessment of total suspended solids tss event load and its uncertainties in Combined Sewer System from continuous turbidity measurements
    Urban Water Journal, 2017
    Co-Authors: Ali Hannouche, Claude Joannis, Ghassan Chebbo
    Abstract:

    AbstractThis paper presents a methodology for assessing TSS wet weather event load along with the associated uncertainties from continuous turbidity measurements. The proposed method is applied to dozens of rainfall events sampled on various urban catchments in the cities of Paris and Nantes. This method takes into account the dependency between the residual errors made by converting the turbidity values into TSS concentrations using an average TSS-turbidity relationship. Results obtained indicate that the inter-event variations of TSS-turbidity relationships induce significant Systematic errors on TSS event loads which can reach ±30% of the average TSS event load.

  • relationship between turbidity and total suspended solids concentration within a Combined Sewer System
    Water Science and Technology, 2011
    Co-Authors: Ali Hannouche, Ghassan Chebbo, Gwenael Ruban, Bruno Tassin, Bruno J Lemaire, Claude Joannis
    Abstract:

    This article confirms the existence of a strong linear relationship between turbidity and total suspended solids (TSS) concentration. However, the slope of this relation varies between dry and wet weather conditions, as well as between sites. The effect of this variability on estimating the instantaneous wet weather TSS concentration is assessed on the basis of the size of the calibration dataset used to establish the turbidity - TSS relationship. Results obtained indicate limited variability both between sites and during dry weather, along with a significant inter-event variability. Moreover, turbidity allows an evaluation of TSS concentrations with an acceptable level of accuracy for a reasonable rainfall event sampling campaign effort.

  • Sterols: a tracer of organic matter in Combined Sewers
    Water Science and Technology, 2008
    Co-Authors: S. Zgheib, Marie-christine Gromaire, C. Lorgeoux, Mohamed Saad, Ghassan Chebbo
    Abstract:

    The important organic pollution of Combined wet weather flows (WWF), its acute impact on receiving waters have been widely demonstrated. The main three possibly origins for this organic pollution are: runoff water (streets and roofs), wastewater and erosion of Sewer sediments in Combined Sewer System. This work, for tracing the origin of organic particles bound in Combined Sewer System, has been focused on the innovative use of sterols. So, eight sterols have been selected and analysed for each kind of sample. Results are represented in contents of sterols (microg g(-1)) and in sterol profiles (%). The comparison of contents and profiles leads the separation between two groups: runoff water, characterized by the total absence of coprostanol, epicoprostanol and coprostanone, and the group of Sewer deposits (gross bed sediment (GBS), organic layer (OL), biofilms) and wastewater. Moreover, Sewer deposits and wastewater can be distinguished by their sterol contents and profiles. To evaluate their contribution to WWF a comparison between sterol signatures is done which shows that these effluents have a strong similarity in profiles and in contents of sterols to the organic layer.

  • Hydrocarbon loads from street cleaning practices: Comparison with dry and wet weather flows in a Parisian Combined Sewer System
    Polycyclic Aromatic Compounds, 2005
    Co-Authors: Johnny Gasperi, Régis Moilleron, Vincent Rocher, Ghassan Chebbo
    Abstract:

    So far little attention has been given to the effect of the street cleaning waters (SCW) load on the Sewer Systems during dry-weather periods. However the knowledge of this pollution is needed to better understand the contribution of SCW to dry weather flow (DWF) pollution within Combined Sewers. Therefore, hydrocarbon loads conveyed by SCW were, analyzed for two different sites of the Paris agglomeration. Median n-alkane, Unresolved Complex Mixture (UCM) and Polycyclic Aromatic Hydrocarbon (PAH) concentrations have been estimated at 19, 628 and 1.4 mu g (.) l(-1) for the Marais catchment (or 4th district), and at 8, 249, and 2.1 mu g (.) l(-1) for the 13th district, respectively.

  • HYDROCARBON LOADS FROM STREET CLEANING PRACTICES: COMPARISON WITH DRY AND WET WEATHER FLOWS IN A PARISIAN Combined Sewer System
    Polycyclic Aromatic Compounds, 2005
    Co-Authors: Johnny Gasperi, Régis Moilleron, Vincent Rocher, Ghassan Chebbo
    Abstract:

    Abstract So far, little attention has been given to the effect of the street cleaning waters (SCW) load on the Sewer Systems during dry-weather periods. However, the knowledge of this pollution is needed to better understand the contribution of SCW to dry weather flow (DWF) pollution within Combined Sewers. Therefore, hydrocarbon loads conveyed by SCW were analyzed for two different sites of the Paris agglomeration. Median n-alkane, Unresolved Complex Mixture (UCM) and Polycyclic Aromatic Hydrocarbon (PAH) concentrations have been estimated at 19, 628 and 1.4 μ g · l− 1for the Marais catchment (or 4th district), and at 8, 249, and 2.1 μ g · l− 1for the 13th district, respectively. The observed contamination was mainly attributed to road traffic. Moreover, a comparison between SCW and street runoff showed that street cleaning removes a higher PAH stock than street runoff. In addition, SCW hydrocarbon fluxes evaluated at 5.4, 178 and 0.4 g · d− 1for n-alkanes, UCM and PAH, respectively, were compared to the...

Jiri Marsalek - One of the best experts on this subject based on the ideXlab platform.

  • characterization of the settling process for wastewater from a Combined Sewer System
    Water Research, 2011
    Co-Authors: Patrizia Piro, Marco Carbone, Nadia Penna, Jiri Marsalek
    Abstract:

    Abstract Among the methods used for determining the parameters necessary for design of wastewater settling tanks, settling column tests are used most commonly, because of their simplicity and low costs. These tests partly mimic the actual settling processes and allow the evaluation of total suspended solids (TSS) removal by settling. Wastewater samples collected from the Liguori Channel (LC) catchment in Cosenza (Italy) were subject to settling column tests, which yielded iso-removal curves for both dry and wet-weather flow conditions. Such curves were approximated well by the newly proposed power law function containing two empirical parameters, a and b, the first of which is the particle settling velocity and the second one is a flocculation factor accounting for deviations from discrete particle settling. This power law function was tested for both the LC catchment and literature data and yielded a very good fit, with correlation coefficient values (R2) ranging from 0.93 to 0.99. Finally, variations in the settling tank TSS removal efficiencies with parameters a and b were also analyzed and provided insight for settling tank design.

Larsgoran Gustafsson - One of the best experts on this subject based on the ideXlab platform.

  • the impacts of climate change and urbanisation on drainage in helsingborg sweden Combined Sewer System
    Journal of Hydrology, 2008
    Co-Authors: Annette Semadenidavies, Claes Hernebring, Gilbert Svensson, Larsgoran Gustafsson
    Abstract:

    Assessment of the potential impact of climate change on water Systems has been an essential part of hydrological research over the last couple of decades. However, the notion that such assessments should also include technological, demographic and land use changes is relatively recent. In this study, the potential impacts of climate change and continued urbanisation on waste and stormwater flows in the Combined Sewer of central Helsingborg, South Sweden, have been assessed using a series of DHI MOUSE simulations run with present conditions as well as two climate change scenarios and three progressive urbanisation storylines. At present, overflows of untreated wastewater following heavy rainfalls are a major source of pollution to the coastal receiving waters and there is a worry that increased rainfall could exacerbate the problem. Sewer flows resulting from different urbanisation storylines were simulated for two 10-year periods corresponding to present (1994-2003) and future climates (nominally 2081-2090). In all, 12 simulations were made. Climate change was simulated by altering a high-resolution rainfall record according to the climate-change signal derived from a regional climate model. Urbanisation was simulated by altering model parameters to reflect current trends in demographics and water management. It was found that city growth and projected increases in precipitation, both together and alone, are set to worsen the current drainage problems. Conversely, System renovation and installation of sustainable urban drainage Systems (SUDS) has a positive effect on the urban environment in general and can largely allay the adverse impacts of both urbanisation and climate change.

  • the impacts of climate change and urbanisation on drainage in helsingborg sweden suburban stormwater
    Journal of Hydrology, 2008
    Co-Authors: Annette Semadenidavies, Claes Hernebring, Gilbert Svensson, Larsgoran Gustafsson
    Abstract:

    Assessment of the potential impact of climate change on water Systems has been an essential part of hydrological research over the last couple of decades. However, the notion that such assessments should also include other changes is relatively recent. In this study, the potential impacts of climate change and continued urbanisation on stormwater flows to a suburban stream, Helsingborg, south Sweden, have been assessed using drainage simulations for present conditions as well as two climate (medium and high gas emission) and two water management storylines for subdivision. Climate change was simulated by altering a high-resolution rainfall record according to the climate-change signal derived from a regional climate model. Subdivision and urbanisation was simulated by altering model parameters chosen to reflect current trends in demographics and water management. The simulations were run for a 15 month period. It was found that city growth and projected increases in heavy rainfalls, both together and alone, are set to raise peak flow volumes and increase flood risk. Conversely, installation of a sustainable urban drainage System (SUDS) has a positive effect on the urban environment in general and can largely allay the adverse impacts of change road. The relative impacts of changes in climate and urbanisation are assessed for the Combined Sewer System which serves central Helsingborg in Semadeni-Davies et al. [Semadeni-Davies A., Hernebring, C., Svensson, G., Gustafsson, L.G., 2008. The impacts of climate change and urbanisation on drainage in Helsingborg, Sweden: Combined Sewer System. J. Hydrol. 350 (1-2), 100-113.

Annette Semadenidavies - One of the best experts on this subject based on the ideXlab platform.

  • the impacts of climate change and urbanisation on drainage in helsingborg sweden Combined Sewer System
    Journal of Hydrology, 2008
    Co-Authors: Annette Semadenidavies, Claes Hernebring, Gilbert Svensson, Larsgoran Gustafsson
    Abstract:

    Assessment of the potential impact of climate change on water Systems has been an essential part of hydrological research over the last couple of decades. However, the notion that such assessments should also include technological, demographic and land use changes is relatively recent. In this study, the potential impacts of climate change and continued urbanisation on waste and stormwater flows in the Combined Sewer of central Helsingborg, South Sweden, have been assessed using a series of DHI MOUSE simulations run with present conditions as well as two climate change scenarios and three progressive urbanisation storylines. At present, overflows of untreated wastewater following heavy rainfalls are a major source of pollution to the coastal receiving waters and there is a worry that increased rainfall could exacerbate the problem. Sewer flows resulting from different urbanisation storylines were simulated for two 10-year periods corresponding to present (1994-2003) and future climates (nominally 2081-2090). In all, 12 simulations were made. Climate change was simulated by altering a high-resolution rainfall record according to the climate-change signal derived from a regional climate model. Urbanisation was simulated by altering model parameters to reflect current trends in demographics and water management. It was found that city growth and projected increases in precipitation, both together and alone, are set to worsen the current drainage problems. Conversely, System renovation and installation of sustainable urban drainage Systems (SUDS) has a positive effect on the urban environment in general and can largely allay the adverse impacts of both urbanisation and climate change.

  • the impacts of climate change and urbanisation on drainage in helsingborg sweden suburban stormwater
    Journal of Hydrology, 2008
    Co-Authors: Annette Semadenidavies, Claes Hernebring, Gilbert Svensson, Larsgoran Gustafsson
    Abstract:

    Assessment of the potential impact of climate change on water Systems has been an essential part of hydrological research over the last couple of decades. However, the notion that such assessments should also include other changes is relatively recent. In this study, the potential impacts of climate change and continued urbanisation on stormwater flows to a suburban stream, Helsingborg, south Sweden, have been assessed using drainage simulations for present conditions as well as two climate (medium and high gas emission) and two water management storylines for subdivision. Climate change was simulated by altering a high-resolution rainfall record according to the climate-change signal derived from a regional climate model. Subdivision and urbanisation was simulated by altering model parameters chosen to reflect current trends in demographics and water management. The simulations were run for a 15 month period. It was found that city growth and projected increases in heavy rainfalls, both together and alone, are set to raise peak flow volumes and increase flood risk. Conversely, installation of a sustainable urban drainage System (SUDS) has a positive effect on the urban environment in general and can largely allay the adverse impacts of change road. The relative impacts of changes in climate and urbanisation are assessed for the Combined Sewer System which serves central Helsingborg in Semadeni-Davies et al. [Semadeni-Davies A., Hernebring, C., Svensson, G., Gustafsson, L.G., 2008. The impacts of climate change and urbanisation on drainage in Helsingborg, Sweden: Combined Sewer System. J. Hydrol. 350 (1-2), 100-113.

Joseph M. Gianvito - One of the best experts on this subject based on the ideXlab platform.

  • Kiski Valley WPCA Combined Sewer System Long Term Model Study
    Journal of Water Management Modeling, 2011
    Co-Authors: Joseph M. Gianvito
    Abstract:

    The Kiski Valley Water Pollution Control Authority (KVWPCA) owns and operates a Combined Sewer System (CSS) which includes 23 diversion chambers, eight pump st…

  • Kiski Valley WPCA Combined Sewer System Long Term Model Study
    2010
    Co-Authors: Joseph M. Gianvito
    Abstract:

    operates a Combined Sewer System (CSS) which includes 23 diversion chambers, eight pump stations, 12.6 mi (20 km) interceptor Sewers, and a wastewater treatment plant (WWTP). KVWPCA decided to use the U. S. Environmental Protection Agency (USEPA)’s CSO Control Policy presump-tion approach criterion 2 through their long term control plan (LTCP) process. In order to assess the overflow volumes relative to total CSS con-veyance on an annual average basis, KVWPCA completed a comprehensive flow monitoring and CSS hydrologic–hydraulic modeling study. The RTK method was used in separate Sewershed areas and a non-linear reservoir method was used in Combined Sewershed areas to simulate the RDII and runoff. Calibration and verification were performed using three criteria: integral square error; the percentage of model peak higher than me-ter peak; and the percentage of model volume higher than meter volume. To evaluate the long term System performance, a one year continuous simula-tion (given the typical precipitation year, which was 41.24 in., 104.74 cm) was run and analyzed (USEPA, 1995b). Traditional methods for these calcu-lations are time consuming, so the authors proposed a new method to calculate the percentage capture. The new method utilizes statistical tools, RDII, runoff, and dry weather analysis during rainfall events. It reduced the calculation time from one week to one hour. The model predicted that 88.09 % Combined sewage is captured and conveyed to the WWTP during wet weather in a typical precipitation year. 288 Kiski Valley WPCA Combined Sewer System Long Term Model Stud