The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Okke Batelaan - One of the best experts on this subject based on the ideXlab platform.
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influence of aquifer thermal energy storage on groundWater quality a review illustrated by seven case studies from belgium
Journal of Hydrology: Regional Studies, 2014Co-Authors: Mathias Possemiers, Marijke Huysmans, Okke BatelaanAbstract:Abstract Study region The area of study is the northern part of Belgium (Flanders). The seven evaluated Aquifer Thermal Energy Storage (ATES) systems are positioned in key aquifers, which contain major groundWater resources for the region. Study focus The increasing number of ATES systems leads to concerns by Drinking Water companies and environmental regulators about the long term impacts of ATES systems on the groundWater quality. This study assesses the influence of ATES on groundWater chemistry by means of a literature review, and a comparison of groundWater quality monitoring data at seven ATES systems with ambient groundWater quality values from 69 monitoring wells. New hydrological insights for the region The results of the analysis of the hydrochemical data confirm that the small temperature differences (Δ T ≤ 10) at which the ATES systems are operating do not influence the concentrations of the main chemical constituents. Mixing of shallow with deeper groundWater during ATES operation, on the other hand, can alter groundWater quality. The results of this study, however, suggest that the groundWater quality changes are rather small, so that there is no immediate risk for the Drinking Water Supply. However, the installation of ATES systems in the vicinity of public Drinking Water Supply well fields should be handled with care, especially in phreatic aquifers.
Michele Vurro - One of the best experts on this subject based on the ideXlab platform.
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Dealing with Uncertainty in Decision-Making for Drinking Water Supply Systems Exposed to Extreme Events
Water Resources Management, 2018Co-Authors: Alessandro Pagano, Anna Bruna Petrangeli, Irene Pluchinotta, Umberto Fratino, Raffaele Giordano, Michele VurroAbstract:The availability and the quality of Drinking Water are key requirements for the well-being and the safety of a community, both in ordinary conditions and in case of disasters. Providing safe Drinking Water in emergency contributes to limit the intensity and the duration of crises, and is thus one of the main concerns for decision-makers, who operate under significant uncertainty. The present work proposes a Decision Support System for the emergency management of Drinking Water Supply systems, integrating: i) a vulnerability assessment model based on Bayesian Belief Networks with the related uncertainty assessment model; ii) a model for impact, and related uncertainty assessment, based on Bayesian Belief Networks. The results of these models are jointly analyzed, providing decision-makers with a ranking of the priority of intervention. A GIS interface (G-Net) is developed to manage both input spatial information and results. The methodology is implemented in L’Aquila case study, discussing the potentialities associated to the use of the tool dealing with information and data uncertainty.
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Drinking Water Supply in resilient cities notes from l aquila earthquake case study
Sustainable Cities and Society, 2017Co-Authors: Alessandro Pagano, Irene Pluchinotta, Raffaele Giordano, Michele VurroAbstract:Abstract Disasters impacts on urban environment are the result of interactions among natural and human systems, which are intimately linked each other. What is more, cities are directly dependent on infrastructures providing essential services (Lifeline Systems, LS). The operation of LS in ordinary conditions as well as after disasters is crucial. Among the LS, Drinking Water Supply deserves a critical role for citizens. The present work summarizes some preliminary activities related to an ongoing EU funded research project. The main aim of the paper is to define a System Dynamic Model (SDM) to assess the evolution of resilience of a Drinking Water Supply system in case of natural disasters, with particular attention to the role of both ‘structural’ and ‘non-structural’ parameters. Reflections are carried out on L’Aquila (Italy) case study, since Drinking Water infrastructures were significantly stressed during the 2009 earthquake, causing a limited functionality in the aftermath of the event. Furthermore, the reallocation of citizens in temporary shelters determined a change in the demand pattern, requiring a dynamic adaptation of the infrastructure. Based on an innovative approach to resilience, the model was developed also to simulate different emergency management scenarios, corresponding to different disaster management strategies.
Unyimadu, John Paul - One of the best experts on this subject based on the ideXlab platform.
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Assessment of regulated halo-acetic acids disinfection by-products and their concomitant risks in Ahmadu Bello University Zaria Drinking Water Supply
Federal University of Technology Minna Niger State Nigeria, 2019Co-Authors: Imodagbe Shaibu, Musah Egbenya, Mohammad, Yahaya Sayyadi, Okuofu, Charles Amen, Williams, Akan Bassey, Unyimadu, John PaulAbstract:The conventionally treated Drinking Water supplied to the Ahmadu Bello University community was assessed for its levels of regulated halo-acetic acids. This is because the Ahmadu Bello University Water treatment plant uses calcium hypochlorite in the chlorinated disinfection of its treated Water during the treatment process. Longitudinal sampling was undertaken along the treatment and distribution stages of Drinking Water Supply in the community. Between 2008 and 2010, 252 samples were collected and analysed for the regulated halo-acetic acids in accordance with USEPA Method 551.1 (1995) using Methyl Tert-Butyl Ether (MTBE) as extractant and a calibrated Agilent Gas Chromatograph measured their concentrations. All the regulated halo acids recorded their highest concentrations in the chlorinated Water sample and these decreased towards house-level Water sample except for dichloroacetic acid which increased from the booster station sample with 3.2500E-03±5.8452E-03 mg/L to the house level sample with 3.2511E-03±9.1256E-05 mg/L. The total regulated halo-acetic acid (THAAs) concentrations also decreased from the chlorinated sample concentration of 1.8324E+00±8.1252E-02 mg/L. to the house level concentration of 4.8826E-01±2.8735E-02 mg/L, a situation likely attributable to the turbulent flow during distribution resulting in the increased volatility of the acids in the distribution system. Although not specifically regulated by the Nigerian National Standards, the concentrations of these acids at house level (4.8826E-01±2.8735E-02 mg/L) Drinking Water is more than the maximum permissible limits of these regulated acids under the USEPA Drinking Water standard’s maximum contaminant level (MCL) of 0.060 mg/L. In view of their implication in increased risk of cancer and other effects including problems of the reproductive system, these acids’ concentration in household Drinking Water need to be rigorously monitored and regulated to minimize their risk to health.Key words: Regulated Halo-acetic acids, Drinking Water, risk of cance
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Assessment of regulated halo-acetic acids disinfection by-products and their concomitant risks in Ahmadu Bello University Zaria Drinking Water Supply
'African Journals Online (AJOL)', 2019Co-Authors: Imodagbe Shaibu, Musah Egbenya, Mohammad, Yahaya Sayyadi, Okuofu C. A., Williams, Akan B., Unyimadu, John PaulAbstract:Abstract The conventionally treated Drinking Water supplied to the Ahmadu Bello University community was assessed for its levels of regulated halo-acetic acids. This is because the Ahmadu Bello University Water treatment plant uses calcium hypochlorite in the chlorinated disinfection of its treated Water during the treatment process. Longitudinal sampling was undertaken along the treatment and distribution stages of Drinking Water Supply in the community. Between 2008 and 2010, 252 samples were collected and analysed for the regulated halo-acetic acids in accordance with USEPA Method 551.1 (1995) using Methyl Tert-Butyl Ether (MTBE) as extractant and a calibrated Agilent Gas Chromatograph measured their concentrations. All the regulated halo acids recorded their highest concentrations in the chlorinated Water sample and these decreased towards house-level Water sample except for dichloroacetic acid which increased from the booster station sample with 3.2500E-03±5.8452E-03 mg/L to the house level sample with 3.2511E-03±9.1256E-05 mg/L. The total regulated halo-acetic acid (THAAs) concentrations also decreased from the chlorinated sample concentration of 1.8324E+00±8.1252E-02 mg/L. to the house level concentration of 4.8826E-01±2.8735E-02 mg/L, a situation likely attributable to the turbulent flow during distribution resulting in the increased volatility of the acids in the distribution system. Although not specifically regulated by the Nigerian National Standards, the concentrations of these acids at house level (4.8826E-01±2.8735E-02 mg/L) Drinking Water is more than the maximum permissible limits of these regulated acids under the USEPA Drinking Water standard’s maximum contaminant level (MCL) of 0.060 mg/L. In view of their implication in increased risk of cancer and other effects including problems of the reproductive system, these acids’ concentration in household Drinking Water need to be rigorously monitored and regulated to minimize their risk to health.turbulent flow during distribution resulting in the increased volatility of the acids in the distribution system. Although not specifically regulated by the Nigerian National Standards, the concentrations of these acids at house level (4.8826E-01±2.8735E-02 mg/L) Drinking Water is more than the maximum permissible limits of these regulated acids under the USEPA Drinking Water standard’s maximum contaminant level (MCL) of 0.060 mg/L. In view of their implication in increased risk of cancer and other effects including problems of the reproductive system, these acids’ concentration in household Drinking Water need to be rigorously monitored and regulated to minimize their risk to health
Alessandro Pagano - One of the best experts on this subject based on the ideXlab platform.
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Dealing with Uncertainty in Decision-Making for Drinking Water Supply Systems Exposed to Extreme Events
Water Resources Management, 2018Co-Authors: Alessandro Pagano, Anna Bruna Petrangeli, Irene Pluchinotta, Umberto Fratino, Raffaele Giordano, Michele VurroAbstract:The availability and the quality of Drinking Water are key requirements for the well-being and the safety of a community, both in ordinary conditions and in case of disasters. Providing safe Drinking Water in emergency contributes to limit the intensity and the duration of crises, and is thus one of the main concerns for decision-makers, who operate under significant uncertainty. The present work proposes a Decision Support System for the emergency management of Drinking Water Supply systems, integrating: i) a vulnerability assessment model based on Bayesian Belief Networks with the related uncertainty assessment model; ii) a model for impact, and related uncertainty assessment, based on Bayesian Belief Networks. The results of these models are jointly analyzed, providing decision-makers with a ranking of the priority of intervention. A GIS interface (G-Net) is developed to manage both input spatial information and results. The methodology is implemented in L’Aquila case study, discussing the potentialities associated to the use of the tool dealing with information and data uncertainty.
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Drinking Water Supply in resilient cities notes from l aquila earthquake case study
Sustainable Cities and Society, 2017Co-Authors: Alessandro Pagano, Irene Pluchinotta, Raffaele Giordano, Michele VurroAbstract:Abstract Disasters impacts on urban environment are the result of interactions among natural and human systems, which are intimately linked each other. What is more, cities are directly dependent on infrastructures providing essential services (Lifeline Systems, LS). The operation of LS in ordinary conditions as well as after disasters is crucial. Among the LS, Drinking Water Supply deserves a critical role for citizens. The present work summarizes some preliminary activities related to an ongoing EU funded research project. The main aim of the paper is to define a System Dynamic Model (SDM) to assess the evolution of resilience of a Drinking Water Supply system in case of natural disasters, with particular attention to the role of both ‘structural’ and ‘non-structural’ parameters. Reflections are carried out on L’Aquila (Italy) case study, since Drinking Water infrastructures were significantly stressed during the 2009 earthquake, causing a limited functionality in the aftermath of the event. Furthermore, the reallocation of citizens in temporary shelters determined a change in the demand pattern, requiring a dynamic adaptation of the infrastructure. Based on an innovative approach to resilience, the model was developed also to simulate different emergency management scenarios, corresponding to different disaster management strategies.
Kanda R - One of the best experts on this subject based on the ideXlab platform.
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Nitrogenous disinfection byproducts in English Drinking Water Supply systems: Occurrence, bromine substitution and correlation analysis
'Elsevier BV', 2015Co-Authors: Bond T, Templeton Mr, Nh ,mokhtar Kamal, Graham N, Kanda RAbstract:Despite the recent focus on nitrogenous disinfection byproducts in Drinking Water, there is limited occurrence data available for many species. This paper analyses the occurrence of seven haloacetonitriles, three haloacetamides, eight halonitromethanes and cyanogen chloride in 20 English Drinking Water Supply systems. It is the first survey of its type to compare bromine substitution factors (BSFs) between the haloacetamides and haloacetonitriles. Concentrations of the dihalogenated haloacetonitriles and haloacetamides were well correlated. Although median concentrations of these two groups were lower in chloraminated than chlorinated surface Waters, median BSFs for both in chloraminated samples were approximately double those in chlorinated samples, which is significant because of the higher reported toxicity of the brominated species. Furthermore, median BSFs were moderately higher for the dihalogenated haloacetamides than for the haloacetonitriles. This indicates that, while the dihalogenated haloacetamides were primarily generated from hydrolysis of the corresponding haloacetonitriles, secondary formation pathways also contributed. Median halonitromethane concentrations were remarkably unchanging for the different types of disinfectants and source Waters: 0.1 μg·mgTOC−1 in all cases. Cyanogen chloride only occurred in a limited number of samples, yet when present its concentrations were higher than the other N-DBPs. Concentrations of cyanogen chloride and the sum of the halonitromethanes were not correlated with any other DBPs
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Nitrogenous disinfection byproducts in English Drinking Water Supply systems: Occurrence, bromine substitution and correlation analysis.
'Elsevier BV', 2015Co-Authors: Bond T, Nh ,mokhtar Kamal, Graham N, Templeton Mr, Kanda RAbstract:Despite the recent focus on nitrogenous disinfection byproducts in Drinking Water, there is limited occurrence data available for many species. This paper analyses the occurrence of seven haloacetonitriles, three haloacetamides, eight halonitromethanes and cyanogen chloride in 20 English Drinking Water Supply systems. It is the first survey of its type to compare bromine substitution factors (BSFs) between the haloacetamides and haloacetonitriles. Concentrations of the dihalogenated haloacetonitriles and haloacetamides were well correlated. Although median concentrations of these two groups were lower in chloraminated than chlorinated surface Waters, median BSFs for both in chloraminated samples were approximately double those in chlorinated samples, which is significant because of the higher reported toxicity of the brominated species. Furthermore, median BSFs were moderately higher for the dihalogenated haloacetamides than for the haloacetonitriles. This indicates that, while the dihalogenated haloacetamides were primarily generated from hydrolysis of the corresponding haloacetonitriles, secondary formation pathways also contributed. Median halonitromethane concentrations were remarkably unchanging for the different types of disinfectants and source Waters: 0.1 μg·mgTOC(-1) in all cases. Cyanogen chloride only occurred in a limited number of samples, yet when present its concentrations were higher than the other N-DBPs. Concentrations of cyanogen chloride and the sum of the halonitromethanes were not correlated with any other DBPs.The Department for Environment, Food and Rural Affairs (Defra) and the Drinking Water Inspectorate (DWI) for England and Wales are gratefully acknowledged for funding this work, as part of project DWI 70/2/268
