The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Ghassan Chebbo - One of the best experts on this subject based on the ideXlab platform.
-
Hydrocarbon loads from Street Cleaning practices: Comparison with dry and wet weather flows in a Parisian combined sewer system
Polycyclic Aromatic Compounds, 2005Co-Authors: Johnny Gasperi, Régis Moilleron, Vincent Rocher, Ghassan ChebboAbstract: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, 2005Co-Authors: Johnny Gasperi, Régis Moilleron, Vincent Rocher, Ghassan ChebboAbstract: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...
-
The quality of Street Cleaning waters: comparison with dry and wet weather flows in a Parisian combined sewer system
Urban Water, 2000Co-Authors: Marie-christine Gromaire, S. Garnaud, M. Ahyerre, Ghassan ChebboAbstract:Abstract The pollutant loads conveyed by Street Cleaning waters, by Street runoff and the maximum pollutant load that can be removed from a Street surface by water were measured for three Streets in central Paris. Suspended solids (SS), chemical oxygen demand (COD), biological oxygen demand 5 (BOD5) and heavy metal loads were measured as well as the pollutant contents of transported particles and settling velocities. The contribution of Street Cleaning to dry weather flow pollution in combined sewers and its effect on wet weather flow pollution are discussed. Street Cleaning waters are a minor source of dry weather pollution – with the exception of lead – and of dry weather flow volume. The pollutant load removed on a daily basis from Street surfaces by Street Cleaning waters was found to be similar to that removed during one rainfall event, for SS and organic matter. However, it was five times lower for heavy metals. This load is nevertheless far inferior to the total mass of pollutants stored on the Street surface. Thus, the effect of Street Cleaning on abating runoff pollution seems limited. An unexpected effect of Street Cleaning is that it induces sediment erosion inside the sewer during dry weather periods, thus reducing the stock of pollutants available for wet weather flow.
Melanie Samson - One of the best experts on this subject based on the ideXlab platform.
-
Privatizing Collective Public Goods: a Case Study of Street Cleaning in Johannesburg, South Africa
Studies in Political Economy, 2007Co-Authors: Melanie SamsonAbstract:Where Ruckert’s article considers the uneven effects of hegemonic strategies, Melanie Samson examines the partial and fragmented effects of privatization and the spatialization of social policy. Her study “Privatizing Collective Public Goods: A Case Study of Street Cleaning in Johannesburg, South Africa” examines how the privatization of Street Cleaning in Johannesburg took different and uneven forms, and the ways in which that unevenness served to reinscribe gender, race, and class hierarchies. In exploring and exposing the varied experiences of privatization, Samson’s article also provides insight into how state restructuring can engender new divisions such as, in her context, between workers and citizens.
William R. Selbig - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of leaf removal as a means to reduce nutrient concentrations and loads in urban stormwater
The Science of the total environment, 2016Co-Authors: William R. SelbigAbstract:While the sources of nutrients to urban stormwater are many, the primary contributor is often organic detritus, especially in areas with dense overhead tree canopy. One way to remove organic detritus before it becomes entrained in runoff is to implement a city-wide leaf collection and Street Cleaning program. Improving our knowledge of the potential reduction of nutrients to stormwater through removal of leaves and other organic detritus on Streets could help tailor more targeted municipal leaf collection programs. This study characterized an upper ideal limit in reductions of total and dissolved forms of phosphorus and nitrogen in stormwater through implementation of a municipal leaf collection and Street Cleaning program in Madison, WI, USA. Additional measures were taken to remove leaf litter from Street surfaces prior to precipitation events. Loads of total and dissolved phosphorus were reduced by 84 and 83% (p
Vincent Herve - One of the best experts on this subject based on the ideXlab platform.
-
aquatic urban ecology at the scale of a capital community structure and interactions in Street gutters
The ISME Journal, 2018Co-Authors: Vincent Herve, Boris Leroy, Albert Da Silva Pires, Pascal J LopezAbstract:In most cities, Streets are designed for collecting and transporting dirt, litter, debris, storm water and other wastes as a municipal sanitation system. Microbial mats can develop on Street surfaces and form microbial communities that have never been described. Here, we performed the first molecular inventory of the Street gutter-associated eukaryotes across the entire French capital of Paris and the non-potable waters sources. We found that the 5782 OTUs (operational taxonomic units) present in the Street gutters which are dominated by diatoms (photoautotrophs), fungi (heterotrophs), Alveolata and Rhizaria, includes parasites, consumers of phototrophs and epibionts that may regulate the dynamics of gutter mat microbial communities. Network analyses demonstrated that Street microbiome present many species restricted to gutters, and an overlapping composition between the water sources used for Street Cleaning (for example, intra-urban aquatic networks and the associated rivers) and the gutters. We propose that Street gutters, which can cover a significant surface area of cities worldwide, potentially have important ecological roles in the remediation of pollutants or downstream wastewater treatments, might also be a niche for growth and dissemination of putative parasite and pathogens.
Pascal J Lopez - One of the best experts on this subject based on the ideXlab platform.
-
aquatic urban ecology at the scale of a capital community structure and interactions in Street gutters
The ISME Journal, 2018Co-Authors: Vincent Herve, Boris Leroy, Albert Da Silva Pires, Pascal J LopezAbstract:In most cities, Streets are designed for collecting and transporting dirt, litter, debris, storm water and other wastes as a municipal sanitation system. Microbial mats can develop on Street surfaces and form microbial communities that have never been described. Here, we performed the first molecular inventory of the Street gutter-associated eukaryotes across the entire French capital of Paris and the non-potable waters sources. We found that the 5782 OTUs (operational taxonomic units) present in the Street gutters which are dominated by diatoms (photoautotrophs), fungi (heterotrophs), Alveolata and Rhizaria, includes parasites, consumers of phototrophs and epibionts that may regulate the dynamics of gutter mat microbial communities. Network analyses demonstrated that Street microbiome present many species restricted to gutters, and an overlapping composition between the water sources used for Street Cleaning (for example, intra-urban aquatic networks and the associated rivers) and the gutters. We propose that Street gutters, which can cover a significant surface area of cities worldwide, potentially have important ecological roles in the remediation of pollutants or downstream wastewater treatments, might also be a niche for growth and dissemination of putative parasite and pathogens.