| 1. |
- Rosqvist, Håkan, et al.
(författare)
-
Development of an innovative methodology for monitoring of in situ remediation of chlorinated solvents – the MIRACHL-project
- 2018
-
Ingår i: ; , s. 112-112
-
Konferensbidrag (refereegranskat)abstract
- BackgroundDense Non Aqueous Phase Liquids (DNAPL) such as chlorinated solvents are common pollutants stemming from different types of industries including dry cleaning facilities, and reports on cases showing serious risk to soil and ground water are frequent on a global scale. DNAPLs are especially problematic as they are denser than water and move down through the groundwater, not always following the groundwater flow but are mainly driven by gravitational forces. Difficulties associated with remediation activities of DNAPLs are many, especially delineation of the source plume, and understanding of the migration of contaminated groundwater in the underground.Therefore, the Swedish national environmental authority, (SEPA) has called for new and innovative in-situ remediation techniques.The MIRACHL-project (monitoring of in situ remediation of chlorinated hydrocarbon contaminants - http://mirachl.com/) are focused on developing new and innovative methods for better understanding of the transport and fate of chlorinated solvents in soil and groundwater. The MIRACHL-project combine three methods; i)geoelectrical imaging by the geophysical method Direct Current resistivity and Induced Polarisation (DCIP), ii)Physical and BioGeochemical Characterisation (PBGC) and iii)the method Compound-specific isotope analysis (CSIA). The MIRACHL-project, based at the Engineering Geology at Lund University, is a collaborative project including several other universities and other relevant organizations, In particular, the collaboration on field sites with the Geological Survey of Sweden (SGU) is of great importance.AimIn the MIRACHL project we develop an integrated methodology based on threemethods, i.e., Direct Current resistivity and Induced Polarisation (DCIP), Physical and BioGeochemical Characterisation (PBGC) and the method Compound-specific isotope analysis (CSIA), to better understand and map in situ remediation processes. A combination of continuous geo-electrical observations during the decontamination, together with the analysis of biogeochemistry and isotope fractionation, provides opportunities to follow transport and fate of chlorinated solvents during different types of in-situ remediation processes.The MIRACHL-project started in 2016 and will continue until 2022. In 2017, theMIRACHL methodology was established at two sites in collaboration with SGU, i.e., in Hagfors and Alingsås. At both site contaminations coming from dry cleaning facilities are in focus. The geology and hydrogeology is very different at these sites and the presentation will show the status in mapping and monitoring the ongoing remediation at the sites.ConclusionInitial studies performed at a site in Kristianstad (Färgaren 3) show the combination of DCIP, PBGC, and CSIA are promising methodology for mapping of transport and fate of chlorinated solvents. We will present on-going research on two sites where contamination from chlorinated solvents are in focus, i.e, contamination due to dry cleaning activities in Hagfors and Alingsås.
|
|
| 2. |
- Åkesson, Sofia, et al.
(författare)
-
Characterizing natural degradation of tetrachloroethene (PCE) using a multidisciplinary approach
- 2020
-
Ingår i: Ambio: a Journal of the Human Environment. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 50, s. 1074-1088
-
Tidskriftsartikel (refereegranskat)abstract
- A site in mid-western Sweden contaminated with chlorinated solvents originating from a previous dry cleaning facility, was investigated using conventional groundwater analysis combined with compound-specific isotope data of carbon, microbial DNA analysis, and geoelectrical tomography techniques. We show the value of this multidisciplinary approach, as the different results supported each interpretation, and show where natural degradation occurs at the site. The zone where natural degradation occurred was identified in the transition between two geological units, where the change in hydraulic conductivity may have facilitated biofilm formation and microbial activity. This observation was confirmed by all methods and the examination of the impact of geological conditions on the biotransformation process was facilitated by the unique combination of the applied methods. There is thus significant benefit from deploying an extended array of methods for these investigations, with the potential to reduce costs involved in remediation of contaminated sediment and groundwater.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
-
Arsenic Research and Global Sustainability: Proceedings of the Sixth International Congress on Arsenic in the Environment (As2016), June 19-23, 2016, Stockholm, Sweden
- 2016
-
Proceedings (redaktörskap) (refereegranskat)abstract
- The Congress "Arsenic in the Environment" offers an international, multi- and interdisciplinary discussion platform for research and innovation aimed towards a holistic solution to the problem posed by the environmental toxin arsenic, with considerable societal impact. The congress has focused on cutting edge and breakthrough research in physical, chemical, toxicological, medical, agricultural and other specific issues on arsenic across a broader environmental realm. The Congress "Arsenic in the Environment" was first organized in Mexico City (As2006) followed by As2008 in Valencia, Spain, As2010 in Tainan, Taiwan, As2012 in Cairns, Australia and As2014 in Buenos Aires, Argentina. The 6th International Congress As2016 was held June 19-23, 2016 in Stockholm, Sweden and was entitled Arsenic Research and Global Sustainability.
|
|
| 8. |
- Banzhaf, Stefan, 1980, et al.
(författare)
-
A review of contamination of surface-, ground-, and drinking water in Sweden by perfluoroalkyl and polyfluoroalkyl substances (PFASs)
- 2017
-
Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 46:3, s. 335-346
-
Forskningsöversikt (refereegranskat)abstract
- Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are found in aquatic systems, flora, and fauna worldwide. These potentially harmful compounds are also frequently detected in Sweden and have already resulted in severe problems for public drinking water supply, i.e., some wells had to be closed due to high PFAS concentrations both in raw water and produced drinking water. Knowledge on PFAS occurrence in Sweden is still quite low, although monitoring is currently ongoing. This work describes potential sources for PFASs to enter the drinking water supply in Sweden and compares different occurrences of PFASs in raw and drinking water in the country. Moreover, the monitoring history, the legal situation, and remediation actions taken are presented. Finally, future challenges and the way forward in Sweden are discussed.
|
|
| 9. |
|
|
| 10. |
- Dahlin, Torleif, et al.
(författare)
-
Geoelectrical Imaging for Pre-investigation for Urban Underground Infrastructure
- 2014
-
Ingår i: ; , s. 46-46
-
Konferensbidrag (refereegranskat)abstract
- The project is part of the Geoinfra TRUST framework that is working towards developing techniques for more cost efficient and sustainable underground construction in urban areas (see http://trust-geoinfra.se/ for more information). This project aims at development and adaptation of DCIP (DC resistivity and induced polarisation) imaging for use in urban environments, and includes demonstration and evaluation of geoelectric map-ping in this context. Establishment of how well engineering and environmental key parameters can be estimated from models based on time-domain spectral IP is another aim. One part of the work is 3D data acquisition methodology and strategies, including different electrode arrays and combina-tions of surface and borehole electrode arrays. Adaptation and evaluation of data acquisition equipment is included, where evaluation comprises synthetic examples from numerical mod-elling as well as field experiments. Development of software for 3D inversion of spectral time-domain IP data is a key part of the project. Ways of integrating other types of data in the inversion process are also part of the task.The possibility to establish more accurate characterisation of engineering and environmental key properties based on models derived from inversion of spectral time-domain IP data will also be investigated. This includes soil and rock properties, tectonic structures, existence and character of buried waste and derelict industrial areas, as well as water and contaminant occurrence and transport. Preliminary evaluation suggests that free phase chlorinated hydrocarbons are visible as high resistive zones.
|
|
| 11. |
-
Grundvattendagarna 2013
- 2013
-
Proceedings (redaktörskap) (refereegranskat)abstract
- Den här rapporten innehåller en sammanställning av abstracts som ligger till underlag för de presentationer som presenterades på konferensen Grundvattendagarna i Lund den 16–17 oktober 2013. Konferensen anordnades av SGU i samarbete med Geologiska institutionen på Lunds uni-versitet och Länsstyrelsen Skåne. Ett av konferensens syften var att få till en bred uppslutning från olika organisationer, myndigheter, konsulter, universitet, etc., och att skapa goda förutsättningar för att överföra kunskap och knyta kontakter för framtida samarbeten. Totalt har inte mindre än 59 olika bidrag kommit in och omfattningen på innehållet är verkligen stort. Det har varit en ära att få anordna konferensen och vi är tacksamma för det stora intresse som ni visat.
|
|
| 12. |
|
|
| 13. |
- Johansson, Sara, et al.
(författare)
-
Combining spectral induced polarization with x-ray tomography to investigate the importance of DNAPL geometry in sand samples
- 2019
-
Ingår i: Geophysics. - : Society of Exploration Geophysicists. - 0016-8033 .- 1942-2156. ; 84:3, s. 173-188
-
Tidskriftsartikel (refereegranskat)abstract
- Whilst many studies have been performed to investigate the spectral induced polarization (SIP) response of Non-aqueous Phase Liquid (NAPL) contaminated soil samples there are still many uncertainties in the interpretation of the data. A key issue is that altered pore space geometries due to the presence of a NAPL phase will change the measured IP spectra. However, without any information on the NAPL distribution in the pore space, assumptions are necessary for the SIP data interpretation. Therefore, experimental data of SIP signals directly associated with different NAPL distributions is needed. We use high-resolution x-ray tomography and 3D image processing to quantitatively assess NAPL distributions in samples of fine-grained sand containing different concentrations of tetrachloroethylene (PCE) and link this to SIP measurements on the same samples. The total concentration of the sample constituents as well as the volumes of the individual NAPL blobs were calculated and used for the interpretation of the associated SIP responses. The x-ray tomography and image analysis showed that the real sample properties (porosity and NAPL distributions) differed from the targeted ones. Both contaminated samples contained less NAPL than expected from the manual sample preparation. The SIP results showed higher real conductivity and lower imaginary conductivity in the contaminated samples compared to a clean sample. This is interpreted as an effect of increased surface conductivity along interconnected NAPL blobs and decreased surface areas in the samples due to NAPL blobs larger than and enclosing grains. We conclude that the combination of SIP, x-ray tomography and image analysis is a very promising approach to achieve a better understanding of the measured SIP responses of NAPL contaminated samples.
|
|
| 14. |
|
|
| 15. |
|
|
| 16. |
|
|
| 17. |
- Polya, David, et al.
(författare)
-
Groundwater arsenic biogeochemistry - Key questions & use of tracers to understand arsenic-prone groundwater systems
- 2019
-
Ingår i: Geoscience Frontiers. - : Elsevier BV. - 1674-9871. ; 10:5, s. 1635-1641
-
Forskningsöversikt (refereegranskat)abstract
- Over 100,000,000 people worldwide are exposed to high arsenic groundwater utilised for drinking or cooking. The consequent global avoidable disease burden is estimated to be of the order of 100,000 avoidable deaths or more per annum from just direct exposures e i.e. excluding indirect exposure (from rice and other foods) and excluding morbidity. Notwithstanding 1000s of papers published on arsenic (hydro) (bio)geochemistry, there remain a number of key outstanding questions to be addressed in relation to arsenic geoscience e these include questions related to: (i) the role of human activities - irrigation, agriculture and other land uses e on arsenic mobilisation in groundwaters; (ii) the specificsources, nature and role of organics, minerals and microbial communities involved in arsenic mobilisation; (iii) the relationship to microscopic to macroscopic scale geological (including tectonic) and evolution processes; (iv) unravelling the over-printing of multiple processes in complex highly heterogeneous aquifer systems and (v) using increasing understanding of the controls of arsenic mobility in groundwaters systems to informing improved locally-relevant remediation and mitigation approaches.This article further summarises how the 9 further papers in this thematic issue address some of these questions through the use of chemical and/or isotopic tracers.
|
|
| 18. |
|
|
| 19. |
|
|
| 20. |
|
|
| 21. |
|
|
| 22. |
- Sparrenbom, Charlotte J., et al.
(författare)
-
Geoelectrical imaging for site investigation for urban underground infrastructure : a TRUST-project
- 2013
-
Ingår i: ; , s. 64-65
-
Konferensbidrag (refereegranskat)abstract
- Unforeseen ground conditions are risk factors often leading to delays and significant additional costs in conjunction with underground infrastructure construction work. There are two main geological hazards that are important to identify, manage, or possibly avoid, for safe and efficient underground construction. The first is unstable rock and the second is large groundwater inflow. The latter exists in most underground projects. Other problems are related to human activities such as waste deposits, industrial activities, handling of chemicals and underground activities such as mining and pumping of water. On old landfills and industrial sites, the market value of real estate often increases as cities expand leading to an interest in development. These old and often abandoned areas (former chemical industry, gasworks, impregnation plants, chemical cleaning etc.) are often associated with highly con-taminated soil and soil water.
|
|
| 23. |
- Sparrenbom, Charlotte J., et al.
(författare)
-
Investigation of chlorinated solvent pollution with resistivity and induced polarization
- 2017
-
Ingår i: Science of the Total Environment. - : Elsevier BV. - 0048-9697. ; 575, s. 767-778
-
Tidskriftsartikel (refereegranskat)abstract
- Globally, an enormous number of polluted areas are in need of remediation to prevent adverse effects on health and environment. In situ remediation and especially the monitoring thereof needs further development to avoid costly and hazardous shipments associated with excavation. The monitoring of in situ remediation actions needs easier and cheaper nondestructive methods for evaluation and verification of remediation degree and degradation status of the contaminants. We investigate the Direct Current resistivity and time-domain Induced Polarization tomography (DCIP) method and its use within the context of a DNAPL (Dense Non-Aqueous Phase Liquids) contaminated site in Varberg, Sweden, where an in situ remediation pilot test has been performed by stimulated reductive dechlorination by push injection. Our results show that the DCIP technique is an emerging and promising technique for mapping of underground structures and possibly biogeochemical spatial and temporal changes. The methodology could in combination with drilling, sampling and other complementary methods give an almost continuous image of the underground structures and delineation of the pollutant situation. It can be expected to have a future in monitoring approaches measuring time lapse induced polarization (IP), if more research is performed on the parameters and processes affecting the IP-signals verifying the interpretations. The IP technique can possibly be used for verification of the effectiveness of in situ remediation actions, as the current sampling methodology is inadequate.
|
|
| 24. |
- Sparrenbom, Charlotte J., et al.
(författare)
-
Stimulated reductive dechlorination identified with induced polarization - a new opportunity to monitor in situ remediation of chlorinated solvents?
- 2015
-
Konferensbidrag (refereegranskat)abstract
- Theme; 1. Dealing with contamination of soil, groundwater and sedimentDevelopments in technologies, policies, concepts, regulation, managementTitle of session; 1a. Assessment and monitoringSubject: New investigation and monitoring techniques Titel: ”Stimulated reductive dechlorination identified with induced polarization - a new opportunity to monitor in situ remediation of chlorinated solvents?”Presenter and authors: Charlotte Sparrenbom1, Sofia Åkesson1, David Hagerberg1 & 2, Sara Johansson2 & 3, Torleif Dahlin31.Department of Geology, Lund University, Lund, Sölvegatan 12, SE-223 62 Lund, SwedenTel: +46462223954, mob: +46 72 2225266E-mail: charlotte.sparrenbom@geol.lu.se 2.Tyréns AB, Isbergs gata 15, SE-205 19 Malmö, Sweden3.Engineering Geology, Lund University, Box 118, SE-221 00 Lund, SwedenPoster presentationPresently in Sweden, large numbers of polluted areas are remediated by excavation and then deposition of contaminated masses on landfills or in best cases off site treatment efforts. In-situ remediation and especially the monitoring thereof needs further development to avoid the costly and somewhat hazardous shipments associated with excavation. The monitoring of in-situ remediation actions needs easier and cheaper nondestructive methods for evaluation of remediation degree and degradation status of the contaminant. Within the TRansparent Underground Structures research project (TRUST), we investigate the Direct Current resistivity and time-domain Induced Polarization tomography (DCIP) method and its use within the context of DNAPL contaminated sites. DCIP is an emerging and promising new technique for 2D, 3D and 4D mapping of underground hydrogeochemical structures and details, as well as spatial distribution of contaminants. DCIP is a non-invasive and non-destructive geoelectrical measurement method that among other things has high potential for providing indirect evidence of contaminant degradation status. In our investigations, we show the results from DCIP measurements in an area where pilot studies with stimulated reductive dechlorination have been performed on an old industrial (textile and mechanical industry) site highly contaminated with TCE and its degradation products. The area treated reveal sharp anomalies in the DCIP response and more ongoing measurements and groundwater sampling is currently taking place to study and evaluate the possible uses, benefits and limitations of the technique. Other promising uses for the DCIP technique are to monitor changes and to delimit areas polluted by chlorinated solvents (DNAPL).Our current investigations focus on the soil and groundwater geochemistry and its DCIP response patterns and causes, as well as its possible temporal changes due to geochemical changes when pollutant degradation occur and concentration changes. Several drillings together with soil and groundwater samplings provide reference data showing free-phase TCE in part of the soil and a complex geological setting with quick transport pathways within the fissured bedrock aquifer below the top soil cover. We aim to establish if differences in IP effects and changes in IP anomalies can become a future effective tool for evaluating the degree of degradation and monitor in-situ remediation of chlorinated hydrocarbons as well as to delimit the areas affected by the pollutant.
|
|
| 25. |
|
|
| 26. |
- Sparrenbom, Charlotte J., et al.
(författare)
-
Vatten, vatten, bara vanligt vatten?
- 2015
-
Ingår i: 15 hållbara lösningar för framtiden. - 9789198157758 ; , s. 165-177
-
Bokkapitel (populärvet., debatt m.m.)abstract
- Vatten är en naturresurs som vi kanske tar lite för mycket för givet i vårt land. Grundvattenforskaren charlotte Sparrenbom menar att skyddet av den kanske viktigaste naturresursen för vår överlevnad är kraftigt eftersatt. hon vill väcka till eftertanke om hur vårt fotavtryck ser ut för kommande generationer, och föreslå sätt att komma igång med bättre skydd av vårt vatten.
|
|
| 27. |
- ÅKESSON, MARIA, et al.
(författare)
-
Datering av grundvatten ur ett riskfokusperspektiv
- 2013
-
Ingår i: ; , s. 79-79
-
Konferensbidrag (refereegranskat)abstract
- I Naturvårdsverkets miljömålsuppföljning från 2013 slås det fast att förorenat grundvatten utgör ett nationellt problem. Det konstateras vidare att uppföljningen och övervakning-en av förorenat grundvatten är otillräcklig, något som även uppmärksammats i EUs vattendirektivsuppföljning (2012). Förekomsten av förorenande ämnen i svenska grundvatten-magasin behöver utredas bättre, inte minst för att så effektiva åtgärder som möjligt ska kunna sättas in. En central del av sådana utredningar är en tidsmässig koppling mellan infiltration och observation av grundvattnet i fråga, då denna är en förutsättning för en koppling mellan orsak (på ytan) och verkan (i grundvattnet). Åldersdatering av grundvatten kan möjliggöra en sådan koppling, och utgör således ett potentiellt kraftfullt riskbedömningsverktyg.
|
|
| 28. |
- ÅKESSON, MARIA, et al.
(författare)
-
Hur gammalt är VATTNET?
- 2014
-
Ingår i: Geologiskt Forum. - 1104-4721. ; :81, s. 14-14
-
Tidskriftsartikel (populärvet., debatt m.m.)
|
|
