Licha, Tobias

[["dc.bibliographiccitation.firstpage","533"],["dc.bibliographiccitation.journal","Geothermics"],["dc.bibliographiccitation.lastpage","539"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Maier, Friedrich"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T10:03:59Z"],["dc.date.available","2018-11-07T10:03:59Z"],["dc.date.issued","2015"],["dc.description.abstract","The estimation of thermal drawdown and its spatial and temporal evolution is a major challenge in the context of geothermal reservoir management. Column experiments were performed with the aim of assessing the potential of thermo-sensitive tracers to measure prevailing in situ temperatures of the flowed-through medium, The results from 40 isothermal experiments with different residence times and temperatures using thermo-sensitive tracers are presented. The resulting precise temperature estimates were independent of the residence time and measured concentration. Considering pH, an accuracy of up to 1 K was achieved. The underlying theory was successfully verified and the general applicability proven. (C) 2014 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","German Ministry for Environment (BMU) [0325417]"],["dc.identifier.doi","10.1016/j.geothermics.2014.09.007"],["dc.identifier.isi","000347493800046"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38596"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1879-3576"],["dc.relation.issn","0375-6505"],["dc.title","Temperature determination using thermo-sensitive tracers: Experimental validation in an isothermal column heat exchanger"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","200"],["dc.bibliographiccitation.journal","International Journal of Greenhouse Gas Control"],["dc.bibliographiccitation.lastpage","208"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Maier, Friedrich"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Sauter, Martin"],["dc.date.accessioned","2018-06-28T09:17:33Z"],["dc.date.available","2018-06-28T09:17:33Z"],["dc.date.issued","2013"],["dc.description.abstract","The storage of supercritical carbon dioxide in deep saline aquifers requires new techniques to assess plume spreading, storage efficiencies and operational strategies after and during injections. In this work, a new class of reactive tracers (KIS tracers) planned to be used for the characterization of interfacial areas between supercritical CO2 and formation brine is presented. The implementation of a time-dependent hydrolysis reaction at the interface enables to investigate the development of the CO2/brine interface. Besides the basic concept for these novel tracers and the methodology for a suitable target molecular design, the desired tracer properties as well as the exemplary synthesis of first promising compounds are presented here. Additionally, the first experimental results of an analog study in a static two-phase batch system are shown and evaluated with a newly developed macroscopic model. Subsequently, the numerical forward modeling of different functions for the interfacial area change is described. The first results are promising and show the potential for new applications of KIS tracers after further research."],["dc.identifier.doi","10.1016/j.ijggc.2013.01.020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15155"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","A new generation of tracers for the characterization of interfacial areas during supercritical carbon dioxide injections into deep saline aquifers: Kinetic interface-sensitive tracers (KIS tracer)"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","24"],["dc.bibliographiccitation.journal","International Journal of Greenhouse Gas Control"],["dc.bibliographiccitation.lastpage","43"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Tatomir, Alexandru Bogdan"],["dc.contributor.author","Halisch, Matthias"],["dc.contributor.author","Duschl, Florian"],["dc.contributor.author","Peche, Aaron"],["dc.contributor.author","Wiegand, Bettina A."],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Niemi, Auli"],["dc.contributor.author","Bensabat, Jacob"],["dc.contributor.author","Sauter, Martin"],["dc.date.accessioned","2018-11-07T10:14:41Z"],["dc.date.available","2018-11-07T10:14:41Z"],["dc.date.issued","2016"],["dc.description.abstract","Heltez, Israel is the location for an onshore deep saline CO2 storage pilot site. The 'Heletz sandstone' is the building unit of the deep saline reservoir. Based on core samples of sandstone and caprock taken from the newly drilled injection (H18A) and monitoring wells (H18B), this article examines and reports the petrophysical properties of the Heletz Formation reservoir important for the short and long term trapping of CO2. A suite of laboratory and pore-scale CT-based modeling techniques are employed to determine the flow and transport parameters used by the continuum-scale numerical simulators and the mineral composition necessary for the understanding of mineral trapping processes. The effect of diagenesis on the reservoir parameters was determined in the laboratory using sedimentological, petrological, and petrophysical analyses. Variations in Sr-87/Sr-86 isotope composition and fluid inclusion analysis bring additional information about the diagenetic development and define the status quo of fluid-mineral reactions before CO2 injection. Cathodoluminescence microscopy and SEM/XRD revealed the amounts of minerals in the sandstone samples and caprock and explained the poor binding of the sandstone which may lead to mobilized material during injection. Digital image analysis on thin sections, cathodoluminescence, and SEM were integrated with attributes derived from mercury intrusion porosimetry, steady state gas permeametry or nuclear magnetic resonance to form an essential outline for the Heletz Formation reservoir. This relates storage space, injectivity and storage efficiency to features such as grain size, pore size distribution, effective porosity, intrinsic permeability, or tortuosity. Furthermore, the laboratory and numerical CT-based investigation techniques are compared and discussed. The benefit of combining experimental methods and numerical simulations on pore-scale models is the increase in confidence of the parameter accuracy, fundamental for the success of the planned activities at Heletz. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","European Community [227286, 282900, 309067]"],["dc.identifier.doi","10.1016/j.ijggc.2016.01.030"],["dc.identifier.isi","000378004200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40663"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1878-0148"],["dc.relation.issn","1750-5836"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.title","An integrated core-based analysis for the characterization of flow, transport and mineralogical parameters of the Heletz pilot CO2 storage site reservoir"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","370"],["dc.bibliographiccitation.journal","Journal of Hydrology"],["dc.bibliographiccitation.lastpage","379"],["dc.bibliographiccitation.volume","546"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Warner, Wiebke"],["dc.contributor.author","Kutzner, Susann"],["dc.contributor.author","Boernick, Hilmar"],["dc.contributor.author","Worch, Eckhard"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T10:26:31Z"],["dc.date.available","2018-11-07T10:26:31Z"],["dc.date.issued","2017"],["dc.description.abstract","Based on the assumption that the specific surface area to volume ratio A(surf)/V of consolidated rock materials is proportional to the surface area available for sorption, several inorganic cations were recently proposed as sorbing (cation exchanging) tracers for estimating these ratios in aquifers (e.g.,for deriving the efficient heat exchange area of geothermal reservoirs). The main disadvantages of inorganic ions, however, are the limited number of suitable ions, their potential geogenic background, and their challenging online detection at trace concentrations. In this work, the spectrum of chemical substances used as sorbing tracers expands by considering fluorescent organic compounds that are cationic. They have the advantage of being highly water soluble and easy to measure online at very low concentrations. Results from systematic lab column experiments with seven selected organic cations under various conditions (different salinities and temperatures) are presented, emphasizing the potential of organic molecules as alternative sorbing tracers especially in consolidated aquifer systems. This work is a first stepping stone in identifying suitable molecular structures that can be selected or even individually adapted to the requirements of the tracer tests and prevailing aquifer conditions. (C) 2017 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jhydrol.2017.01.013"],["dc.identifier.isi","000395607700031"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43063"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1879-2707"],["dc.relation.issn","0022-1694"],["dc.title","Organic molecules as sorbing tracers for the assessment of surface areas in consolidated aquifer systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","110"],["dc.bibliographiccitation.journal","Water Research"],["dc.bibliographiccitation.lastpage","121"],["dc.bibliographiccitation.volume","74"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Kroeger, Kerrin Franziska"],["dc.contributor.author","Noedler, Karsten"],["dc.contributor.author","Ayora, Carlos"],["dc.contributor.author","Carrera, Jesus"],["dc.contributor.author","Hernandez, Marta"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T09:57:56Z"],["dc.date.available","2018-11-07T09:57:56Z"],["dc.date.issued","2015"],["dc.description.abstract","Soil aquifer treatment is widely applied to improve the quality of treated wastewater in its reuse as alternative source of water. To gain a deeper understanding of the fate of thereby introduced organic micropollutants, the attenuation of 28 compounds was investigated in column experiments using two large scale column systems in duplicate. The influence of increasing proportions of solid organic matter (0.04% vs. 0.17%) and decreasing redox potentials (denitrification vs. iron reduction) was studied by introducing a layer of compost. Secondary effluent from a wastewater treatment plant was used as water matrix for simulating soil aquifer treatment. For neutral and anionic compounds, sorption generally increases with the compound hydrophobicity and the solid organic matter in the column system. Organic cations showed the highest attenuation. Among them, breakthroughs were only registered for the cationic beta-blockers atenolol and metoprolol. An enhanced degradation in the columns with organic infiltration layer was observed for the majority of the compounds, suggesting an improved degradation for higher levels of biodegradable dissolved organic carbon. Solely the degradation of sulfamethoxazole could clearly be attributed to redox effects (when reaching iron reducing conditions). The study provides valuable insights into the attenuation potential for a wide spectrum of organic micropollutants under realistic soil aquifer treatment conditions. Furthermore, the introduction of the compost layer generally showed positive effects on the removal of compounds preferentially degraded under reducing conditions and also increases the residence times in the soil aquifer treatment system via sorption. (C) 2015 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.watres.2015.02.010"],["dc.identifier.isi","000353748800011"],["dc.identifier.pmid","25723339"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37266"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0043-1354"],["dc.title","Influence of a compost layer on the attenuation of 28 selected organic micropollutants under realistic soil aquifer treatment conditions: Insights from a large scale column experiment"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","12"],["dc.bibliographiccitation.journal","Chemosphere"],["dc.bibliographiccitation.lastpage","25"],["dc.bibliographiccitation.volume","103"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T09:40:56Z"],["dc.date.available","2018-11-07T09:40:56Z"],["dc.date.issued","2014"],["dc.description.abstract","An increasing number of organic compounds detected today in the aquatic environment are ionizable and, therefore, partially or permanently charged (ionic) under the pH conditions encountered in these systems. For evaluating their environmental behavior, which strongly depends on the charge state, the identification of functional groups together with their correct assignment of the respective acidic or basic dissociation constants (plc) is essential. Despite the growing concern and increasing awareness for ionizable compounds, contradicting and/or confusing information regarding their acid/base properties can be regularly found in the literature, especially when complex structures are encountered. Therefore, we provide a simplified, general, and comprehensive guideline for the identification of ionizable functional groups in organic compounds combined with the correct assignment of their respective pK(a) values. Beside the explicit definition of basic terms, several tables with more than 30 of the most frequently encountered ionizable compound classes, including their typical pK(a) value ranges are the centerpiece of the proposed procedure. The straight forward application of the guideline is successfully shown for several environmentally relevant compounds as example. (C) 2013 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.chemosphere.2013.12.009"],["dc.identifier.isi","000334481900002"],["dc.identifier.pmid","24412098"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33609"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1879-1298"],["dc.relation.issn","0045-6535"],["dc.title","A guideline for the identification of environmentally relevant, ionizable organic molecule species"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","187"],["dc.bibliographiccitation.journal","The Science of The Total Environment"],["dc.bibliographiccitation.lastpage","194"],["dc.bibliographiccitation.volume","524"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T09:53:16Z"],["dc.date.available","2018-11-07T09:53:16Z"],["dc.date.issued","2015"],["dc.description.abstract","The pH-dependent molecule speciation (charge state) in solution strongly influences the transport of ionizable organic compounds in the aquatic environment. Therefore, the sorption behavior is complex and reliable predictions only based on physico-chemical sorbate, sorbent and solution properties are challenging. A short overview of underlying sorption processes causing retardation during the solute transport in aquifers is completed by a description of approaches for estimating respective sorption coefficients/retardation factors and discussed together with their limitations. Based on these initial considerations, a systematic framework is proposed, which allows the assessment of transport properties of organic molecule species by their chemical nature (neutral, acidic, basic, ampholytic). As a result, the transport properties of many (ionizable) organic molecules of interest- can be assessed and even first presumptions for the sorption behavior of new and not yet investigated molecules can be derived. (C) 2015 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","German Research Foundation (DFG) [LI 1314/3-1, LI 1314/3-2]"],["dc.identifier.doi","10.1016/j.scitotenv.2015.04.006"],["dc.identifier.isi","000355010400019"],["dc.identifier.pmid","25897727"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36297"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1879-1026"],["dc.relation.issn","0048-9697"],["dc.title","A framework for assessing the retardation of organic molecules in groundwater: Implications of the species distribution for the sorption-influenced transport"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","229"],["dc.bibliographiccitation.journal","Journal of Colloid and Interface Science"],["dc.bibliographiccitation.lastpage","236"],["dc.bibliographiccitation.volume","484"],["dc.contributor.author","Kutzner, Susann"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Worch, Eckhard"],["dc.contributor.author","Boernick, Hilmar"],["dc.date.accessioned","2018-11-07T10:04:31Z"],["dc.date.available","2018-11-07T10:04:31Z"],["dc.date.issued","2016"],["dc.description.abstract","The fundamental understanding of organic cation-solid phase interactions is essential for improved predictions of the transport and ultimate environmental fates of widely used substances (e.g., pharmaceutical compounds) in the aquatic environment. We report sorption experiments of two cationic model compounds using two silica gels and a natural aquifer sediment. The sorbents were extensively characterized and the results of surface titrations under various background electrolyte concentrations were discussed. The salt dependency of sorption was systematically studied in batch experiments over a wide concentration range (five orders of magnitude) of inorganic ions in order to examine the influence of increasing competition on the sorption of organic cations. The organic cation uptake followed the Freundlich isotherm model and the sorption capacity decreases with an increase in the electrolyte concentration due to the underlying cation exchange processes. However, the sorption recovers considerably at high ionic strength (I> 1 M). To our knowledge, this effect has not been observed before and appears to be independent from the sorbent characteristics and sorbate structure. Furthermore, the recovery of sorption was attributed to specific, non-ionic interactions and a connection between the sorption coefficient and activity coefficient of the medium is presumed. Eventually, the reasons for the differing sorption affinities of both sorbates are discussed. (C) 2016 Elsevier Inc. All rights reserved."],["dc.identifier.doi","10.1016/j.jcis.2016.08.029"],["dc.identifier.isi","000385690200026"],["dc.identifier.pmid","27619382"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38710"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Academic Press Inc Elsevier Science"],["dc.relation.issn","1095-7103"],["dc.relation.issn","0021-9797"],["dc.title","Sorption of organic cations onto silica surfaces over a wide concentration range of competing electrolytes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","273"],["dc.bibliographiccitation.journal","Water Research"],["dc.bibliographiccitation.lastpage","283"],["dc.bibliographiccitation.volume","54"],["dc.contributor.author","Kutzner, Susann"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Boernick, Hilmar"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Worth, Eckhard"],["dc.date.accessioned","2018-11-07T09:41:04Z"],["dc.date.available","2018-11-07T09:41:04Z"],["dc.date.issued","2014"],["dc.description.abstract","Systematic batch experiments with the organic monovalent cation metoprolol as sorbate and the synthetic material silica gel as sorbent were conducted with the aim of characterizing the sorption of organic cations onto charged surfaces. Sorption isotherms for metoprolol (>99% protonated in the tested pH of around 6) in competition with mono- and divalent inorganic cations (Na+, NH4+, Ca2+, and Mg2+) were determined in order to assess their influence on cation exchange processes and to identify the role of further sorptive interactions. The obtained sorption isotherms could be described well by an exponential function (Freundlich isotherm model) with consistent exponents (about 0.8). In general, a decreasing sorption of metoprolol with increasing concentrations in inorganic cations was observed. Competing ions of the same valence showed similar effects. A significant sorption affinity of metoprolol with ion type dependent Freundlich coefficients K-F,K-0.77 between 234.42 and 426.58 (L/kg)(0.77) could still be observed even at very high concentrations of competing inorganic cations. Additional column experiments confirm this behavior, which suggests the existence of further relevant interactions beside cation exchange. In subsequent batch experiments, the influence of mixtures with more than one competing ion and the effect of a reduced negative surface charge at a pH below the point of zero charge (pH(PZC) approximate to 2.5) were also investigated. Finally, the study demonstrates that cation exchange is the most relevant but not the sole mechanism for the sorption of metoprolol on silica gel. (C) 2014 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.watres.2014.01.042"],["dc.identifier.isi","000334003000027"],["dc.identifier.pmid","24584001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33644"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0043-1354"],["dc.title","Sorption of the organic cation metoprolol on silica gel from its aqueous solution considering the competition of inorganic cations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","301"],["dc.bibliographiccitation.journal","Geothermics"],["dc.bibliographiccitation.lastpage","306"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Schaffer, Mario"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2020-12-10T14:24:22Z"],["dc.date.available","2020-12-10T14:24:22Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.geothermics.2017.12.006"],["dc.identifier.issn","0375-6505"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72225"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","The feasibility of using carbamates to track the thermal state in geothermal reservoirs"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]