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Special Issue "Groundwater Contamination and Remediation"

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Quality and Ecosystems".

Deadline for manuscript submissions: closed (20 June 2018)

Special Issue Editors

Guest Editor
Dr. Timothy D. Scheibe

Laboratory Fellow, Pacific Northwest National Laboratory, Richland, WA, USA
Website | E-Mail
Phone: +1-509-371-7633
Interests: groundwater; reactive transport; biogeochemistry; microbial transport; heterogeneity; multiscale modelling; pore scale modelling; river-groundwater interactions; computational earth science
Guest Editor
Prof. Dr. David C. Mays

Associate Professor of Civil Engineering, University of Colorado Denver, Denver, CO, USA
Website | E-Mail
Phone: +1-303-315-7570
Interests: groundwater; porous media; remediation; complex systems; colloids; clogging; permeability; chaotic advection; urban contaminants

Special Issue Information

Dear Colleagues,

Groundwater is a critical natural resource that can be degraded by contamination.  Contaminants can have natural sources (e.g., arsenic or salinity) or anthropogenic sources (e.g., industrial chemicals, pesticides, or sewage effluent). Remediation activities aim to reduce or eliminate groundwater contaminants, and can include passive methods (e.g., monitored natural attenuation), ex-situ methods (e.g., pump-and-treat), or in-situ methods (e.g., bioremediation or chemical oxidation).

The aim of this Special Issue of Water is to present new research contributions in the broad area of groundwater contamination and remediation. This topic includes studies that elucidate critical processes controlling contaminant sources, transport, and fate in the subsurface environment, methods to identify the concentration and extent of contaminant plumes, as well as novel approaches to predict and enhance the performance of remediation techniques. We encourage contributions on both natural and anthropogenic contaminants, as well as emerging contaminants, such as manufactured nanoparticles or hydraulic fracturing fluids. The breadth of cutting-edge research addressing these topics is substantial, so accordingly this Special Issue will not be able to include studies specifically focused on evaluating the human health impacts of contaminants (i.e., epidemiological studies).

Dr. Timothy D. Scheibe
Prof. Dr. David C. Mays
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Groundwater
  • contamination
  • remediation
  • reactive transport
  • monitored natural attenuation
  • bioremediation
  • water quality

Published Papers (2 papers)

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Research

Open AccessArticle Comparison of Time Nonlocal Transport Models for Characterizing Non-Fickian Transport: From Mathematical Interpretation to Laboratory Application
Water 2018, 10(6), 778; https://doi.org/10.3390/w10060778
Received: 8 May 2018 / Revised: 25 May 2018 / Accepted: 11 June 2018 / Published: 13 June 2018
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Abstract
Non-Fickian diffusion has been increasingly documented in hydrology and modeled by promising time nonlocal transport models. While previous studies showed that most of the time nonlocal models are identical with correlated parameters, fundamental challenges remain in real-world applications regarding model selection and parameter
[...] Read more.
Non-Fickian diffusion has been increasingly documented in hydrology and modeled by promising time nonlocal transport models. While previous studies showed that most of the time nonlocal models are identical with correlated parameters, fundamental challenges remain in real-world applications regarding model selection and parameter definition. This study compared three popular time nonlocal transport models, including the multi-rate mass transfer (MRMT) model, the continuous time random walk (CTRW) framework, and the tempered time fractional advection–dispersion equation (tt-fADE), by focusing on their physical interpretation and feasibility in capturing non-Fickian transport. Mathematical comparison showed that these models have both related parameters defining the memory function and other basic-transport parameters (i.e., velocity v and dispersion coefficient D) with different hydrogeologic interpretations. Laboratory column transport experiments and field tracer tests were then conducted, providing data for model applicability evaluation. Laboratory and field experiments exhibited breakthrough curves with non-Fickian characteristics, which were better represented by the tt-fADE and CTRW models than the traditional advection–dispersion equation. The best-fit velocity and dispersion coefficient, however, differ significantly between the tt-fADE and CTRW. Fitting exercises further revealed that the observed late-time breakthrough curves were heavier than the MRMT solutions with no more than two mass-exchange rates and lighter than the MRMT solutions with power-law distributed mass-exchange rates. Therefore, the time nonlocal models, where some parameters are correlated and exchangeable and the others have different values, differ mainly in their quantification of pre-asymptotic transport dynamics. In all models tested above, the tt-fADE model is attractive, considering its small fitting error and the reasonable velocity close to the measured flow rate. Full article
(This article belongs to the Special Issue Groundwater Contamination and Remediation)
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Open AccessArticle Potential Impact of In-Situ Oil Shale Exploitation on Aquifer System
Water 2018, 10(5), 649; https://doi.org/10.3390/w10050649
Received: 18 March 2018 / Revised: 3 May 2018 / Accepted: 10 May 2018 / Published: 17 May 2018
PDF Full-text (1800 KB) | HTML Full-text | XML Full-text
Abstract
The effects of heat on physical and hydraulic properties of oil shale were investigated. The porosity and water absorption of oil shale increased with increasing pyrolysis temperature. The porosity increased by 19.048% and water absorption increased by 0.76% when oil shale was heated
[...] Read more.
The effects of heat on physical and hydraulic properties of oil shale were investigated. The porosity and water absorption of oil shale increased with increasing pyrolysis temperature. The porosity increased by 19.048% and water absorption increased by 0.76% when oil shale was heated to 500 °C. Thus, originally impermeable oil shale was converted to a permeable rock formation, facilitating interactions between surrounding groundwater and oil. Heated oil shale was immersed in water, which showed strong alkaline properties. The content of Ca2+ remained stable and a slight decrease in SO42− content was observed. Hydrocarbon content in the water samples reached maximum concentration within three days. Full article
(This article belongs to the Special Issue Groundwater Contamination and Remediation)
Figures

Figure 1

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