contaminant source Articles
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A New Way to Locate Seeps Into Surface Waters
How can we determine where groundwater is seeping into rivers and bays? Knowing seep locations can help with selecting sampling locations, identifying contaminant sources, determining whether contamination is historic or on-going, and designing remediation. Historically, methods for locating seeps have been limited. Due to cost, sampling can only be done at a few locations. This means we ...
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Mobile Monitoring System Speeds Detection, Localization and Troubleshooting of Molecular Contamination Sources
Abstract Decreasing the time to detect, contain and mitigate very low levels of Airborne Contamination (AMC) is becoming more critical for high tech manufacturers. Costs associated with AMC-related quality issues and yield losses are well understood, and adequate reduction of AMC is critical for clean manufacturers to stay competitve. Technical personnel need the flexibility to efficiently ...
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Project - Former Laundry
Contamination Source Source of contamination: 900m² Kf: 10-5m/s; ground water level: 14m u. top ground surface The Goal Mass discharge Time span: 24 months ...
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Logistic regression analysis to estimate contaminant sources in water distribution systems
Accidental or intentional contamination in a water distribution system (WDS) has recently attracted attention due to the potential hazard to public health and the complexity of the contaminant characteristics. The accurate and rapid characterization of contaminant sources is necessary to successfully mitigate the threat in the event of contamination. The uncertainty surrounding the contaminants, ...
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Polycyclic aromatic hydrocarbons in Niger Delta soil: contamination sources and profiles
Abstract The distribution and sources of PAHs in soil as well as PAHs profiles have been investigated in areas with anthropogenic pollution in the Niger Delta (Nigeria) such as Warri and Ughelli. PAHs were identified in 21 soil samples (0- 10cm upper layer) collected in May, 2003. The typical total PAHs level in Niger Delta soil ranged from 182 ± 112 – to - 433 ±256 ìg/kg dw. PAH ...
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Effects of temperature and predator on the persistence of host-specific
Bacteroides-Prevotella genetic markers in waterGenetic markers derived from Bacteroidales spp. have been proposed as promising indicators for fecal contamination in the water environment. However, little is known about the persistency of Bacteroidales spp. 16S rRNA genetic markers in the natural environment, which hampers the precise identification of fecal contamination sources. In this study, the persistency of human-specific ...
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Identification of groundwater pollution sources based on a modified plume comparison method
The identification of groundwater contaminant sources is a primary step in designing and implementing a remediation strategy. The work presented here was undertaken to develop an efficient strategy that addresses the unknown multiple contaminant sources problem, and that could identify the number, location and magnitude of the groundwater contaminant sources and select optimal sampling ...
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The value of utilising stochastic mapping of food distribution networks for understanding risks and tracing contaminant pathways
Difficulties in adequately characterising food supply chain topologies contribute major uncertainty to risk assessments of the food sector. The capability to trace contaminated foods forward (to consumers) and back (to providers) is needed for rapid recalls during food contamination events. The objective of this work is to develop an approach for risk mitigation that protects us from an attack on ...
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Estimation of pathogen concentrations in a drinking water source using hydrodynamic modelling and microbial source tracking
The faecal contamination of drinking water sources can lead to waterborne disease outbreaks. To estimate a potential risk for waterborne infections caused by faecal contamination of drinking water sources, knowledge of the pathogen concentrations in raw water is required. We suggest a novel approach to estimate pathogen concentrations in a drinking water source by using microbial source ...
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1,1,1-TCA Bioremediation with CL-Out - Case Study
Site Summary CL-Out bioaugmentation was implemented to remediate 1,1,1-TCA in ground water at an operating steel manufacturing facility. The source area was initially treated by ozone injection for two years. Then, a high vacuum extraction system was installed in the source area for two years. These efforts reduced the concentration of contamination in the source area, but the 1,1,1-TCA ...
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Hitting the Bull`s-Eye in Groundwater Sampling
Many commonly used groundwater sampling techniques and procedures have resulted from methods developed for water supply investigations. These methods have persisted, even though the monitoring goals may have changed from water supply development to contaminant source and plume delineation. Unfortunately, the use of these methods can result in an incorrect understanding of the contaminant ...
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Mineral oil contaminations in cardboard
SpeedExtractor E-916: Optimization of pressurized solvent extraction (PSE) for the rapid and efficient determination of MOSH and MOAH in cardboard Many food samples are often contaminated with mineral oil coming from different sources. One possible source of contamination is the migration from cardboard packaging made of recycled fibres. The main sources of contamination are the inks coming ...
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Occurrence of bacteriophages infecting
Aeromonas ,Enterobacter , andKlebsiella in water and association with contamination sources in ThailandThe co-residence of bacteriophages and their bacterial hosts in humans, animals, and environmental sources directed the use of bacteriophages to track the origins of the pathogenic bacteria that can be found in contaminated water. The objective of this study was to enumerate bacteriophages of Aeromonas caviae (AecaKS148), Enterobacter sp. (EnspKS513), and Klebsiella pneumoniae (KlpnKS648) in ...
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Shallow groundwater surrounding the Likeng landfill, Guangzhou, China – major ions and elements indicating the contamination sources
An investigation of groundwater contamination around the Likeng landfill, Guangzhou, was carried out. Major ions and elements of 34 groundwater samples were measured, and the Piper trilinear diagram and expanded Durov diagram were used to analyze the chemical types and hydro-geochemical processes of the groundwater. End Member Mixing Analysis was used to find the types and sources of ...
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Optimal sensor placement for event detection and source identification in water distribution networks
This study focuses on the optimization of sensor placement with respect to the source identification and event detection. A multi-objective algorithm is used to solve the optimization problem. The numbers of possible source nodes for contamination events associated with the solutions on the Pareto fronts from the proposed method and benchmark method are calculated under the same configuration ...
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Steps to Ensuring a Successful Audit: Effective Risk Assessment Design
Abstract When designing a process, product quality is an important measure of success. To ensure product quality, it is imperative that the environment is monitored for contamination. The best way to locate sources of contamination is via risk assessment, best performed before a process has been implemented. There are multiple tools to assist in completing a risk assessment, and once completed, ...
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Parsing pyrogenic PAHs: Forensic chemistry, receptor models, and source control policy
A realistic understanding of contaminant sources is required to set appropriate control policy. Forensic chemical methods can be powerful tools in source characterization and identification, but they require a multiple‐lines‐of‐evidence approach. Atmospheric receptor models, such as EPA's Chemical Mass Balance (CMB), are increasingly being used to evaluate sources of pyrogenic polycyclic ...
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Removal of trichloroethylene in groundwater with two oxidants: siderite catalyzed hydrogen peroxide and sodium persulfate
Trichloroethylene (TCE), a widely used solvent, is often determined in groundwater and is one of biologically refractory organic contaminants. The aim of the study is to use a new chemical oxidation method to degrade TCE source pollution in groundwater. Fenton-like reactions (hydrogen peroxide catalyzed by iron minerals generates hydroxyl radicals) and sodium persulfate activation (sodium ...
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Advances in Multilevel Well Technology
Several detailed field studies performed at research sites in the 1980’s and 1990’s suggest that most contaminant plumes exhibit large variations in concentration over small vertical distances. These variations are caused by spatial variations in the contaminant source zones and heterogeneity of the geologic materials. Conventional monitoring wells have been shown to be ineffective for ...
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Shenandoah, VA - DNAPL in clay at active facility - Case Study
Guaranteed Remediation of TCE and 1,1-DCE in Soil and Bedrock Project Summary TRS Group implemented an electrical resistance heating (ERH) remedy to remove trichloroethylene (TCE) in overburden soil surrounding a former dry well located at a manufacturing facility in Shenandoah, Virginia. TCE soil concentrations were measured at levels that were indicative of separate-phase liquid. Initial ...
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