Electrokinetic delivery of reagents for groundwater remediation

L'abstract è presente nell'allegato / the abstract is in the attachmen

Salford postgraduate annual research conference (SPARC) 2012 proceedings

These proceedings bring together a selection of papers from the 2012 Salford Postgraduate Annual Research Conference (SPARC). They reflect the breadth and diversity of research interests showcased at the conference, at which over 130 researchers from Salford, the North West and other UK universities presented their work. 21 papers are collated here from the humanities, arts, social sciences, health, engineering, environment and life sciences, built environment and business

Management of contaminants in low permeability media

2014 Summer.Includes bibliographical references.To view the abstract, please see the full text of the document

Non-Aqueous Phase Liquid Transport and Dynamics in Simulated Karst Conduits

Flow and contaminant transport in karstic aquifers differs drastically from porous media. Little work has been done to quantify the transport dynamics of non-aqueous phase liquids (NAPLs) in karst in the lab. Some studies have 3-D printed fractures to evaluate multiphase transport at the core scale, but examination of conduit flow using this technique is lacking in the literature. This project illustrates some of the strengths and limitations of 3-D printing and using X-ray computed tomography (XRCT) to characterize flow. After testing prints made from stereolithographic resin (SLA) and polyactic acid (PLA) plastic, we decided to use acrylonitrile butadiene styrene (ABS) plastic to construct flow cells to image turbulent water-NAPL-analog flow in conduits using XRCT. To mimic conduit flow transport dynamics, printed conduit apertures are elliptical and measure more than 1 cm in cross sectional area to promote turbulent flow. Fused filament fabrication, a type of 3-D printing process used during construction, produces permeable prints. To minimize communication between the conduit and surrounding support matrix allowing reuse of flow cells, we moderately melted cores using acetone vapor. This allows dissolved plastic to fill and harden between layers making the walls impermeable. Flow of water and hydrogel beads, a potential non-toxic NAPL analog tracer candidate, was imaged with a modified XRCT scanner. XRCT images were stitched together to identify conduit irregularities, and to image beads as they move through the conduit. Future work aims to develop hydrogel beads that behave like NAPLs in the lab. As a novel technique in karst modeling, printing and imaging requires further validation. Our images do not differentiate between beads, epoxy, and plastic, making validation difficult. Future work should involve radiologic agents added to water and NAPL-analogs during experimentation to increase the contrast between water and hydrogel beads in order to clarify flow paths

The influence of landfill covers on the generation of leachate

A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science in Engineering. Johannesburg, 1992World trends in the landfilling of municipal solid waste, and the design of landfill covers are reviewed. Current approaches to solving leachate problems associated with landfills emphasise the use of landfill liners and leachate collection systems. The installation of liner and leachate treatment systems is expensive. Furthermore, the lives of such systems are likely to be shorter than the time over which the landfill will continue to emit pollutants. The use of landfill covers (which are relatively cheap) to eliminate or minimise leachate production is therefore an attractive proposition. The principle behind using covers to solve leachate problems is their ability to alter the water balance of the landfill. [Abbreviated Abstract. Open document to view full version

Watershed Management Tools: Hazardous Site Case History, Reference Stream Analysis, and GIS Analysis of Fire Risk

My portfolio explores some tools that are used to protect or assess watershed health and the experiences and lessons I learned during my time in the Environmental Studies program. The first piece in my portfolio is a case study that looks at the history of pollution ad cleanup of the kraft pulp mill along the Clark Fork River. In my study, I look closely at the EPA’s investigation of the site and the community’s reaction to the findings. In my second piece, I describe my field and lab experience working for the Montana Department of Environmental Quality. During this time, I was part of a team that characterized Montana’s least impacted streams, giving me insight into a process that helps inform water quality standards. For my last piece I analyzed the ignition and spread risks of fire around Lolo Peak using geographic data analyzed in ArcGIS. I also used this data to assess possible watershed impacts from the 2017 Lolo Peak Fire.https://scholarworks.umt.edu/grad_portfolios/1004/thumbnail.jp

18th Annual International Conference on Contaminated Soils, Sediments and Water

Conference at a Glance Monday, October 21, 2002 Workshops Workshops # 1, 2 & 3 - 10:00 am - 5:00 pm Workshops # 4 & 5 - 1:00 - 5:00 pm 1: The Indoor Air Exposure Pathway from Chlorinated Solvent Contaminated Groundwater 2: Theory and Use of Field Portable X-ray Fluorescence for Soil Analysis 3: In-Situ Chemical Oxidation Workshop 4: Workshop on Current Spectrochemical Techniques for Determining Heavy Metals in Sediments and Soils 5: Practical Remediation of Volatile Organic Compounds in Soil and Groundwater Tuesday, October 22, 2002 Platform Presentations 8:30am-Noon Session 1: Advances in In-Situ Remediation Session 2: Phytoremediation Session 3: Heavy Metals 1:30pm-5:30pm Session 1: MTBE Session 2: Sediments I Session 3A: RBCA Session 3B: Regulatory Poster Session, 4:00 pm - 6:00 pm , Exhibit Area, First Floor, Campus Center Social: 4:30-6:00 pm Exhibit Area, First Floor Campus Center Workshops (Evening 7:00-10:00 pm) 6: State of the Science in Assessing MTBE Degradation II 7: Recent Improvements in the Practice of Risk Assessment as Illustrated through Case Studies Wednesday, October 23, 2002 Platform Presentations 8:30 am-Noon Session 1: Environmental Forensics I Session 2: MGP Site Closure Session 3: Bioremediation 1:30pm-5:30pm Session 1: Sediments II Session 2: Remediation - Soils Session 3A: Chemical Oxidation Session 3B: Training Range Residues Session 4: Biomarkers for Contamination: Hierarchical Approaches Poster Session, 1:00-3:00 pm, Exhibit Area, First Floor, Campus Center Social: 4:30-6:00 pm Exhibit Area, First Floor Campus Center Workshops (Evening 7:00-10:00pm) 8: Forensic Environmental Geochemistry: Petroleum Fuels 9: MGP Site Closures: Experiences from the Trenches - Point Counter Point Technology Review 10: Environmental Fate of Hydrocarbons in Soils and Groundwater Thursday, October 24, 2002 Platform Presentations 8:30 am-Noon Session 1: Environmental Forensics II Session 2: Remediation - Groundwater Session 3: Arsenic Session 4: Site Assessment/Environmental Fate 1:30pm-5:30pm Session 1: Sediments III Session 2: Risk Assessmen