Biodegradation of monoethanolamine in soil monitored by electrical conductivity measurement: an observational approach

Monoethanolamine (MEA) is commonly used by the natural gas industry to remove acid gases from the natural gas stream. A series of pan test studies was conducted to examine the biodegradability of MEA in soil recovered from a decommissioned sour gas processing plant site. Test results indicate that MEA was successfully biodegraded or transformed into simple compounds under aerobic and anaerobic conditions. The electrical conductivity (EC) of the soil evolved with changing chemical conditions of its by-products during degradation of MEA. Based on experimental observations, five ranges of EC were correlated with five geochemical zones consisting of various concentrations of MEA and its by-products. The five ranges of EC were translated into equivalent in situ EC ranges. Using these in situ EC ranges, an electrical resistivity tomography image was used to create a geochemical interpretation of the subsurface beneath the plant site. The geochemical interpretation can provide useful information for detailed site assessment and remediation design.Key words: electrical conductivity, biodegradation, monoethanolamine, ammonia, acetate, electrical resistivity tomography, site characterization, observational approach.

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Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

10.5194/hess-2019-408 ◽

2019 ◽

Cited By ~ 3

Author(s):

Andrea Palacios ◽

Juan José Ledo ◽

Niklas Linde ◽

Linda Luquot ◽

Fabian Bellmunt ◽

...

Keyword(s):

Electrical Conductivity ◽

Electrical Resistivity ◽

Seawater Intrusion ◽

Electrical Resistivity Tomography ◽

Low Cost ◽

Heavy Rain ◽

Time Lapse ◽

Resistivity Tomography ◽

Bulk Electrical Conductivity ◽

Spatial Coverage

Abstract. Surface electrical resistivity tomography (ERT) is a widely used tool to study seawater intrusion (SWI). It is noninvasive and offers a high spatial coverage at a low cost, but it is strongly affected by decreasing resolution with depth. We conjecture that the use of CHERT (cross-hole ERT) can partly overcome these resolution limitations since the electrodes are placed at depth, which implies that the model resolution does not decrease in the zone of interest. The objective of this study is to evaluate the CHERT for imaging the SWI and monitoring its dynamics at the Argentona site, a well-instrumented field site of a coastal alluvial aquifer located 40 km NE of Barcelona. To do so, we installed permanent electrodes around boreholes attached to the PVC pipes to perform time-lapse monitoring of the SWI on a transect perpendicular to the coastline. After two years of monitoring, we observe variability of SWI at different time scales: (1) natural seasonal variations and aquifer salinization that we attribute to long-term drought and (2) short-term fluctuations due to sea storms or flooding in the nearby stream during heavy rain events. The spatial imaging of bulk electrical conductivity allows us to explain non-trivial salinity profiles in open boreholes (step-wise profiles really reflect the presence of fresh water at depth). By comparing CHERT results with traditional in situ measurements such as electrical conductivity of water samples and bulk electrical conductivity from induction logs, we conclude that CHERT is a reliable and cost-effective imaging tool for monitoring SWI dynamics.

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Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

Hydrology and Earth System Sciences ◽

10.5194/hess-24-2121-2020 ◽

2020 ◽

Vol 24 (4) ◽

pp. 2121-2139 ◽

Cited By ~ 2

Author(s):

Andrea Palacios ◽

Juan José Ledo ◽

Niklas Linde ◽

Linda Luquot ◽

Fabian Bellmunt ◽

...

Keyword(s):

Electrical Conductivity ◽

Electrical Resistivity ◽

Seawater Intrusion ◽

Electrical Resistivity Tomography ◽

Low Cost ◽

Heavy Rain ◽

Time Lapse ◽

Resistivity Tomography ◽

Bulk Electrical Conductivity ◽

Spatial Coverage

Abstract. Surface electrical resistivity tomography (ERT) is a widely used tool to study seawater intrusion (SWI). It is noninvasive and offers a high spatial coverage at a low cost, but its imaging capabilities are strongly affected by decreasing resolution with depth. We conjecture that the use of CHERT (cross-hole ERT) can partly overcome these resolution limitations since the electrodes are placed at depth, which implies that the model resolution does not decrease at the depths of interest. The objective of this study is to test the CHERT for imaging the SWI and monitoring its dynamics at the Argentona site, a well-instrumented field site of a coastal alluvial aquifer located 40 km NE of Barcelona. To do so, we installed permanent electrodes around boreholes attached to the PVC pipes to perform time-lapse monitoring of the SWI on a transect perpendicular to the coastline. After 2 years of monitoring, we observe variability of SWI at different timescales: (1) natural seasonal variations and aquifer salinization that we attribute to long-term drought and (2) short-term fluctuations due to sea storms or flooding in the nearby stream during heavy rain events. The spatial imaging of bulk electrical conductivity allows us to explain non-monotonic salinity profiles in open boreholes (step-wise profiles really reflect the presence of freshwater at depth). By comparing CHERT results with traditional in situ measurements such as electrical conductivity of water samples and bulk electrical conductivity from induction logs, we conclude that CHERT is a reliable and cost-effective imaging tool for monitoring SWI dynamics.

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Electrical resistivity tomography to quantify in situ liquid content in a full-scale dry anaerobic digestion reactor

Bioresource Technology ◽

10.1016/j.biortech.2015.11.033 ◽

2016 ◽

Vol 201 ◽

pp. 89-96 ◽

Cited By ~ 9

Author(s):

L. André ◽

E. Lamy ◽

P. Lutz ◽

M. Pernier ◽

O. Lespinard ◽

...

Keyword(s):

Electrical Resistivity ◽

Anaerobic Digestion ◽

Electrical Resistivity Tomography ◽

Full Scale ◽

Liquid Content ◽

Resistivity Tomography ◽

Dry Anaerobic Digestion

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Monitoring of an In‐Situ Air Sparging Experiment Using Electrical Resistivity Tomography

10.4133/1.2922874 ◽

2001 ◽

Author(s):

Xianjin Yang ◽

Douglas J. LaBrecque ◽

Illa Amerson‐Treat ◽

Richard L. Johnson ◽

Paul Lundegard ◽

...

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Air Sparging ◽

Resistivity Tomography

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Groundwater redox conditions and conductivity in a contaminant plume from geoelectrical investigations

Hydrology and Earth System Sciences ◽

10.5194/hess-8-8-2004 ◽

2004 ◽

Vol 8 (1) ◽

pp. 8-22 ◽

Cited By ~ 136

Author(s):

V. Naudet ◽

A. Revil ◽

E. Rizzo ◽

J.-Y. Bottero ◽

P. Bégassat

Keyword(s):

Electrical Conductivity ◽

Electrical Resistivity ◽

Redox Potential ◽

Linear Correlation ◽

Electrical Resistivity Tomography ◽

The Self ◽

Contaminant Plume ◽

Resistivity Tomography ◽

Self Potential ◽

Good Linear Correlation

Abstract. Accurate mapping of the electrical conductivity and of the redox potential of the groundwater is important in delineating the shape of a contaminant plume. A map of redox potential in an aquifer is indicative of biodegradation of organic matter and of concentrations of redox-active components; a map of electrical conductivity provides information on the mineralisation of the groundwater. Both maps can be used to optimise the position of pumping wells for remediation. The self-potential method (SP) and electrical resistivity tomography (ERT) have been applied to the contaminant plume associated with the Entressen landfill in south-east France. The self-potential depends on groundwater flow (electrokinetic contribution) and redox conditions ("electro-redox" contribution). Using the variation of the piezometric head in the aquifer, the electrokinetic contribution is removed from the SP signals. A good linear correlation (R2=0.85) is obtained between the residual SP data and the redox potential values measured in monitoring wells. This relationship is used to draw a redox potential map of the overall contaminated site. The electrical conductivity of the subsoil is obtained from 3D-ERT analysis. A good linear correlation (R2=0.91) is observed between the electrical conductivity of the aquifer determined from the 3D-ERT image and the conductivity of the groundwater measured in boreholes. This indicates that the formation factor is nearly homogeneous in the shallow aquifer at the scale of the ERT. From this correlation, a map of the pore water conductivity of the aquifer is obtained. Keywords: self-potential, redox potential, electrical resistivity tomography, fluid conductivity, contaminant plume

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Electrical Resistivity Tomography (ERT) for Time-lapse Mapping of in-situ Self-sustaining Treatment for Active Remediati

23rd European Meeting of Environmental and Engineering Geophysics ◽

10.3997/2214-4609.201702077 ◽

2017 ◽

Author(s):

L.M. Trento ◽

P. Tsourlos ◽

J.I. Gerhard ◽

M. McMaster ◽

A. Sims

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Time Lapse ◽

Resistivity Tomography

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Application of Electrical Resistivity Tomography to the detection of the Ermakia (Northern Greece) cavity system

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17298 ◽

2007 ◽

Vol 40 (4) ◽

pp. 2060

Author(s):

G. Vargemezis ◽

P. Tsourlos ◽

C. Papazachos ◽

D. Kostopoulos

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Specific Area ◽

Electrical Tomography ◽

Northern Greece ◽

Resistivity Tomography ◽

Cave System ◽

Cavity System ◽

The City

Electrical resistivity tomography has been applied for the exploration of a karstic cave system at the region of Ermakia, next to the city of Ptolemais (NWt Greece). Geological investigations indicated that the main known Ermakia cave chamber "communicates " with at least one underground karstic ovoid. This evidence lead us to prospect the surrounding area by applying 2-D Electrical tomography survey on a regular grid in both x,y directions. Survey lines crossed the known cave in order to verify k the suitability of the method at the specific area and calibrate the resistivity values. Resistivity data were inverted and results were compiled in qusi3-D resistivity images. The interpreted results indicated the existence of two more chambers next to the known one which is in agreement with in-situ observations.

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